Ford Mustang (1999-2004) Service Manual: Anti-Theft - Passive Anti-Theft System (PATS) (Diagnosis and Testing)

Ford Mustang (1999-2004) Service Manual / Electronic Feature Group / Anti-Theft - PATS / Anti-Theft - Passive Anti-Theft System (PATS) (Diagnosis and Testing)

Refer to Wiring Diagrams Cell 112 , Anti-Theft for schematic and connector information.

Refer to Wiring Diagrams Cell 60 , Instrument Cluster for schematic and connector information.

Special Tool(s)

73III Automotive Meter 105-R0057 or equivalent
Worldwide Diagnostic System (WDS) 418-F224, New Generation STAR (NGS) Tester 418-F052, or equivalent diagnostic tool

Inspection and Verification

NOTE: PATS must be reconfigured upon installment of a new instrument cluster.

1. Verify the customer concern by duplicating the condition.

2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart

Mechanical Electrical
  • Ignition lock cylinder
  • Encoded ignition key (PATS key)
  • Use of non-encoded ignition key (key without the molded plastic head, non-PATS key)
  • Use of a non-programmed encoded ignition key
  • Central junction box fuses:
  • 5 (15A)
  • 21 (5A)
  • 34 (20A)
  • PATS transceiver
  • Connectors
  • Ignition switch

3. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:

  • check that the program card is correctly installed.
  • check the connections to the vehicle.
  • check the ignition switch position.

4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.

5. Carry out the DATA LINK DIAGNOSTIC TEST. If diagnostic tool responds with:

  • CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section .
  • NO RESP/NOT EQUIP for instrument cluster, go to Pinpoint Test A.
  • SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the instrument cluster.

6. If the DTCs retrieved are related to the concern, go to Instrument Cluster Diagnostic Trouble Code (DTC) Index to continue diagnostics.

7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.

Instrument Cluster Diagnostic Trouble Code (DTC) Index

DTC Description Source
B1202 Fuel Sender Open Circuit ICM
B1204 Fuel Sender Short to Ground ICM
B1213 Anti-Theft Number of Programmed Keys is Below Minimum ICM
B2103 or B1232 Antenna Not Connected - Defective Transceiver ICM
B1317 Battery Voltage High ICM
B1318 Battery Voltage Low ICM
B1342 ECU Is Defective ICM
B1356 Ignition Run Circuit Open ICM
B1364 Ignition Start Circuit Open ICM
B1600 PATS Ignition Key Transponder Signal Is Not Received - Damaged Key or Non-PATS Key ICM
B1601 PATS Received Incorrect Key-Code From Ignition Key Transponder (Unprogrammed Encoded Ignition Key) ICM
B1602 PATS Received Invalid Format Of Key-Code From Ignition Key Transponder (Partial Key Read) ICM
B1681 PATS Transceiver Signal Is Not Received (Not Connected, Damaged, or Wiring) ICM
B2139 PCM ID Does Not Match Between Instrument Cluster and PCM ICM
B2141 NVM Configuration Failure (No PCM ID Exchange Between Instrument Cluster and PCM) ICM
B2143 NVM Memory Failure ICM
C1284 Oil Pressure Switch Failure ICM
U1147 SCP Invalid or Missing Data for Vehicle Security PCM/SCP
U1262 Missing SCP Message J1850

Symptom Chart

Condition Possible Sources Action
  • No communication with the instrument cluster
  • Central junction box Fuses:
  • 5 (15A)
  • 21 (5A)
  • 34 (20A)
  • Circuitry
  • Instrument cluster
  • GO to Pinpoint Test A .
  • The anti-theft indicator is always/never on - no three second theft indicator prove out
  • Instrument cluster
  • Theft indicator
  • GO to Pinpoint Test B .
  • The vehicle does not start - theft indicator proves out for three seconds as normal
  • Less than two keys programmed to the system
  • Transceiver not connected/defective
  • Circuitry
  • Transceiver internal antenna damaged
  • NON-PATS key, damaged key or no code received
  • Partial key read of PATS key
  • Unprogrammed PATS key

 

  • No PCM ID stored in PATS
  • PATS/PCM ID do not match
  • Problem with SCP link
  • CARRY OUT Instrument Cluster On-Demand Self-Test. RETRIEVE DTCs. If DTCs are present, GO to Instrument Cluster Diagnostics Trouble Code (DTC) Index. If no DTCs are retrieved, CHECK for other possible no-start causes.

 

  • CLEAR the stored DTCs. CYCLE the ignition key from OFF to RUN. RETRIEVE continuous DTCs. If DTCs are present, GO to Instrument Cluster Diagnostics Trouble Code (DTC) Index. If no DTCs are retrieved, CHECK for other possible causes.
  • The anti-theft system does not operate correctly - the vehicle starts but flashes a fault code on the theft indicator at key on
  • Incorrect PCM calibration
  • GO to Pinpoint Test C .

Pinpoint Tests

PINPOINT TEST A: NO COMMUNICATION WITH THE INSTRUMENT CLUSTER

Test Step Result / Action to Take
A1 CHECK THE BATTERY POWER SUPPLY TO THE INSTRUMENT CLUSTER Yes

GO to A2 .

No

REPAIR the circuit.

REPEAT the self-test.

CLEAR the DTCs.
  • Key in OFF position.
  • Disconnect: Instrument Cluster C220b.
  • Measure voltage between instrument cluster C220b Pin 10, Circuit 729 (RD/WH), harness side and ground.

  • Is the voltage greater than 10 volts?
A2 CHECK THE RUN POWER SUPPLY TO THE INSTRUMENT CLUSTER Yes

GO to A3 .

No

REPAIR the circuit.

REPEAT the self-test.

CLEAR the DTCs.
  • Key in ON position.
  • Measure the voltage between instrument cluster C220b Pin 11, Circuit 489 (PK/BK), harness side and ground.

  • Is the voltage greater than 10 volts?
A3 CHECK RUN/START POWER SUPPLY TO THE INSTRUMENT CLUSTER Yes

GO to A4 .

No

REPAIR Circuit 20 (WH/LB). REPEAT the self-test. CLEAR the DTCs.
  • Measure the voltage between the instrument cluster C220b Pin 12, Circuit 20 (WH/LB), harness side and ground.

  • Is the voltage greater than 10 volts?
A4 CHECK GROUND CIRCUIT 397 (BK/WH) FOR AN OPEN Yes

GO to A5 .

No

REPAIR the circuit.

REPEAT the self-test.

CLEAR the DTCs.
  • Key in OFF position.
  • Measure the resistance between instrument cluster C220b Pin 20, Circuit 397 (BK/WH), harness side and ground.

  • Is the resistance less than 5 ohms?
A5 CHECK GROUND CIRCUIT 1205 (BK) FOR OPEN Yes

REFER to Section.

No

REPAIR the circuit.

REPEAT the self-test.

CLEAR the DTCs.
  • Measure the resistance between instrument cluster C220b Pin 1, Circuit 1205 (BK), harness side and ground.

  • Is the resistance less than 5 ohms?

PINPOINT TEST B: THE ANTI-THEFT INDICATOR IS ALWAYS/NEVER ON - NO THREE SECOND THEFT INDICATOR PROVE OUT

Test Step Result / Action to Take
B1 ENTER THE INSTRUMENT CLUSTER ACTIVE COMMAND MODE Yes

GO to B2 .

No

Go To Pinpoint Test A .
  • Key in OFF position.
  • Connect the diagnostic tool.
  • Enter the instrument cluster active command mode.
  • Can the instrument cluster active command mode be entered?
B2 TRIGGER THE ANTI-THEFT INDICATOR Yes

The anti-theft indicator is OK.

VERIFY the concern with the customer.

No

GO to B3
  • Trigger the instrument cluster active command WARNING LAMPS AND CHIME to ON.
  • Does the anti-theft indicator illuminate?
B3 CHECK THE ANTI-THEFT INDICATOR Yes

INSTALL a new instrument cluster; for additional information, REFER to Section. CYCLE the ignition to RUN using two encoded ignition keys. Go To Pinpoint Test J to initialize the module. REPEAT the self-test. CLEAR the DTCs.

No

INSTALL a new anti-theft LED. For additional information, REFER to Section. REPEAT the selftest.

CLEAR the DTCs.
  • Key in OFF position.
  • Disconnect: Anti-Theft LED.
  • Measure the resistance between the pins of the anti-theft LED in both directions.

  • Is the resistance greater than 10,000 ohms in one direction, and 10-20 ohms in the other direction?

PINPOINT TEST C: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - THE VEHICLE STARTS BUT FLASHES A FAULT CODE ON THE THEFT INDICATOR AT KEY ON

Test Step Result / Action to Take
C1 CHECK THE ANTITHEFT INDICATOR FOR CORRECT OPERATION Yes

If the vehicle starts, VERIFY correct PCM calibration for vehicle.

REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual Section 3.

No

GO to C2 .
  • Key in START position.
  • Verify the theft indicator proves out correctly.
  • Does the vehicle start once the theft proves out?
C2 CHECK THE PCM DIAGNOSTIC CAPABILITY Yes

GO to C3 .

No

REFER to Section.
  • Connect the diagnostic tool.
  • Retrieve and document continuous DTCs.
  • Enter the following diagnostic mode on the diagnostic tool: Clear Continuous DTCs.
  • Enter the following diagnostic mode on the diagnostic tool: PCM Self-Test.
  • Does diagnostic tool communicate with the PCM?
C3 RETRIEVE THE PCM DTCS Yes

GO to C4 .

No

VERIFY PCM power and ground. REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual Section 3.
  • Retrieve and document continuous DTCs.
  • Is DTC P1260 recorded?
C4 CHECK THE COMMUNICATION NETWORK Yes

INSTALL a new instrument cluster; for additional information, REFER to Section. CYCLE the ignition to RUN using two encoded ignition keys. Go To Pinpoint Test J to initialize the module. REPEAT the self-test. CLEAR the DTCs. If DTC U1147 is still present, INSTALL a new PCM; for additional information, REFER to Section. TEST the system for normal operation. (You must follow Pinpoint Test J to initialize module.)

No

System is OK.
  • Repeat Inspection and Verification steps 3 through 7; refer to Inspection and Verification.
  • Key in OFF position.
  • Retrieve and document continuous DTCs.
  • Enter the following diagnostic mode on the diagnostic tool: Clear Continuous DTCs.
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On- Demand Self-Test.
  • Is DTC U1147 retrieved?

PINPOINT TEST D: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - ANTI-THEFT NUMBER OF PROGRAMMED KEYS IS BELOW MINIMUM

Test Step Result / Action to Take
D1 USE THE DTCS FROM THE INSTRUMENT CLUSTER SELF-TESTS Yes

GO to D2 .

No

REPAIR the other DTCs retrieved. REPEAT the Instrument Cluster On-Demand Self-Test. CLEAR the DTCs.
  • Use the recorded results from the Instrument Cluster Continuous and On-Demand Self-Tests.
  • Is DTC B1213 the only DTC retrieved?
D2 CHECK FOR PROGRAMMED ENCODED IGNITION KEYS - MONITOR THE INSTRUMENT CLUSTER PID NUMKEYS Yes

GO to D3 .

No

System is OK.
  • Monitor the instrument cluster PID NUMKEYS.
  • Does the instrument cluster PID NUMKEYS display less than two encoded ignition keys programmed?
D3 PROGRAM ENCODED IGNITION KEYS Yes

CLEAR the DTCs. CARRY OUT the Instrument Cluster On-Demand Self-Test to verify all codes have been cleared. REPEAT the self-test. CLEAR the DTCs.

No

If the theft indicator is on continuously, REPEAT TEST STEP D3 with a second new encoded ignition key. If the theft indicator is flashing, RETRIEVE DTCs stored for the new fault and REPAIR the other DTC(s) retrieved.
  • NOTE: Two programmed encoded ignition keys must be available to start the vehicle.
  • Cut a new encoded ignition key.
  • Key in ON position.
  • Program the new encoded ignition key.
  • Does the theft indicator illuminate for three seconds, and then go out?

PINPOINT TEST E: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - ANTENNA NOT CONNECTED OR DEFECTIVE TRANSCEIVER

Test Step Result / Action to Take
E1 INSPECT THE PATS TRANSCEIVER FOR CORRECT INSTALLATION Yes

INSTALL a new PATS transceiver module; for additional information, REFER to Module-Passive Anti-Theft Transceiver . REPEAT the Instrument Cluster On-Demand Self-Test. CLEAR the DTCs.

No

System is OK.
  • Key in OFF position.
  • Verify the PATS transceiver is correctly installed; refer to Module-Passive Anti-Theft Transceiver .
  • Connect the diagnostic tool.
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On-Demand Self-Test.
  • Retrieve and document continuous DTCs.
  • Enter the following diagnostic mode on the diagnostic tool: Clear Continuous DTCs.
  • Is DTC B1232 or B2103 retrieved?

PINPOINT TEST F: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - PATS IGNITION KEY TRANSPONDER SIGNAL IS NOT RECEIVED (DAMAGED KEY OR NON-PATS KEY)

Test Step Result / Action to Take
NOTE: Large metallic objects, electronic debit transponder devices or a second key on the same key ring as the PATS ignition key may cause vehicle starting problems and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS ignition key while starting the engine. These objects and devices cannot damage the PATS ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn ignition OFF and restart the engine with all other objects on the key ring held away from the ignition key. Check to ensure the encoded ignition key used by the customer is an approved Ford encoded ignition key (encoded ignition keys from Rotunda, Ilco, Curtis, or Strattec are approved Ford encoded ignition keys).
F1 USE THE DTCS FROM THE INSTRUMENT CLUSTER SELF-TESTS Yes

GO to F2 .

No

If other DTCs are retrieved, REFER to Instrument Cluster Diagnostic Trouble Code (DTC) Index.

If no DTCs are retrieved, system is OK.
  • Use the recorded results from the Instrument Cluster Continuous and On-Demand Self-Tests.
  • Is DTC B1600 retrieved?
F2 PROGRAM A NEW ENCODED IGNITION KEY Yes

GO to F3 .

No

If no other DTCs are retrieved, system is OK.

If other DTCs are retrieved, REFER to Instrument Cluster Diagnostic Trouble Code (DTC) Index.
  • Key in OFF position.
  • NOTE: Check to make sure the customer and replacement encoded ignition keys are approved Ford encoded PATS ignition keys. Unapproved PATS keys do not always operate correctly over different temperature ranges (encoded ignition keys from Rotunda, Ilco, or Strattec are approved encoded ignition keys).
  • Cut a new encoded ignition key.
  • Key in ON position.
  • Program the new encoded ignition key; for additional information, refer to Key Programming-Erase All Key Codes and Program Two Keys .
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On-Demand Self-Test.
  • Is DTC B1600 still present?
F3 INSTALL A NEW PATS TRANSCEIVER Yes

INSTALL a new instrument cluster; for additional information, REFER to Section. CYCLE the ignition to RUN using two encoded ignition keys. Go To Pinpoint Test J to initialize the module. REPEAT the self-test. CLEAR the DTCs.

No

System is OK.
  • Key in OFF position.
  • Install a new PATS transceiver; for additional information, refer to Module-Passive Anti-Theft Transceiver .
  • Key in ON position.
  • NOTE: Use the customer's original encoded ignition key, not the encoded ignition key that was cut in the previous step.
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On-Demand Self-Test.
  • Is DTC B1600 retrieved?

PINPOINT TEST G: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - PATS RECEIVED INCORRECT KEY-CODE FROM IGNITION KEY TRANSPONDER (UNPROGRAMMED ENCODED IGNITION KEY)

Test Step Result / Action to Take
NOTE: Large metallic objects, electronic debit transponder devices or a second key on the same key ring as the PATS ignition key may cause vehicle starting problems and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS ignition key while starting the engine. These objects and devices cannot damage the PATS ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn ignition OFF and restart the engine with all other objects on the key ring held away from the ignition key. Check to ensure the encoded ignition key used by the customer is an approved Ford encoded ignition key (encoded ignition keys from Rotunda, Ilco, Curtis, or Strattec are approved Ford encoded ignition keys)
G1 USE THE DTCS FROM THE INSTRUMENT CLUSTER SELF TESTS Yes

GO to G2 .

No

System is OK. CHECK all customer encoded ignition keys with Instrument Cluster On-Demand Self-Test to verify all other encoded ignition keys are programmed.
  • Use the recorded results from the Instrument Cluster Continuous and On-Demand Self-Tests.
  • Is DTC B1601 recorded?
G2 CHECK FOR PROGRAMMED ENCODED IGNITION KEYS - MONITOR THE INSTRUMENT CLUSTER PID NUMKEYS Yes

ERASE and REPROGRAM the key codes; for additional information, REFER to Key Programming- Erase All Key Codes and Program Two Keys .

REPEAT the self-test. CLEAR the DTCs.

No

GO to G3 .
  • Monitor the instrument cluster PID NUMKEYS.
  • Does the instrument cluster PID NUMKEYS display 8?
G3 CHECK THE NUMBER OF PROGRAMMED ENCODED IGNITION KEYS AVAILABLE Yes

GO to G4 .

No

CUT a new encoded ignition keys so that at least two encoded ignition keys are available. PROGRAM the encoded ignition keys; Key Programming-Erase All Key Codes and Program Two Keys . GO to G4 .
  • Verify there are at least two currently programmed encoded ignition keys available with the vehicle.
  • Are at least two currently programmed encoded ignition keys available with the vehicle?
G4 VERIFY THE INSTRUMENT CLUSTER PID SPARE_KY INDICATES ENABLE Yes

REFER to Key Programming-Erase All Key Codes and Program Two Keys . CLEAR the DTCs, REPEAT the self-testGO to G5 .

No

REFER to Key Programming-Enable/Disable Spare Key Programming to enable the PID SPARE KEY to ENABLE. TEST the system for normal operation.

Once completed, GO to G5 .
  • Monitor the instrument cluster PID SPARE_KY.
  • Does the instrument cluster PID SPARE_KY indicate ENABLE?
G5 CHECK THE ENCODED IGNITION KEYS FOR CORRECT OPERATION Yes

System is OK. If there are additional keys that need to be programmed, for additional information, REFER to Key Programming-Program a Key Using Two Programmed Keys .

No

GO to G6 .
  • Key in OFF position.
  • Key in ON position.
  • Start the vehicle using the first encoded ignition key.
  • Key in ON position.
  • Start the vehicle with the second ignition key.
  • Key in OFF position.
  • Does the vehicle start correctly using both encoded ignition keys?
G6 RETRIEVE THE INSTRUMENT CLUSTER DTCS - CHECK FOR DTC B1601 Yes

INSTALL a new instrument cluster; for additional information, REFER to Section. CYCLE the ignition to RUN using two encoded ignition keys. GO to Pinpoint Test J to initialize the vehicle. REPEAT the self-test. CLEAR the DTCs.

No

System is OK.

If other DTCs are retrieved, REFER to Instrument Cluster Module Diagnostic Trouble Code (DTC) Index.
  • Retrieve and document continuous DTCs.
  • Enter the following diagnostic mode on the diagnostic tool: Clear Continuous DTCs.
  • Carry out a instrument cluster self-test using both ignition keys from Step G5.
  • Is DTC B1601 retrieved?

PINPOINT TEST H: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - PATS RECEIVED INVALID FORMAT OF KEY-CODE FROM IGNITION KEY TRANSPONDER (PARTIAL KEY READ)

Test Step Result / Action to Take
NOTE: Large metallic objects, electronic debit transponder devices or a second key on the same key ring as the PATS ignition key may cause vehicle starting problems and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS ignition key while starting the engine. These objects and devices cannot damage the PATS ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn ignition OFF and restart the engine with all other objects on the key ring held away from the ignition key. Check to ensure the encoded ignition key used by the customer is an approved Ford encoded ignition key (encoded ignition keys from Rotunda, Ilco, Curtis, or Strattec are approved Ford encoded ignition keys).
H1 USE THE DTCS FROM THE INSTRUMENT CLUSTER SELF TESTS Yes

GO to H2 .

No

System is OK. CHECK all customer encoded ignition keys with Instrument Cluster On-Demand Self-Test to verify all other keys are programmed.
  • Use the recorded results from the Instrument Cluster Continuous and On-Demand Self-Tests.
  • Is DTC B1602 retrieved?
H2 OBTAIN A NEW ENCODED IGNITION KEY Yes

GO to H3 .

No

System is OK. If the customer has any remaining encoded keys at home, instruct them to carry out Key Programming-Program a Key Using Two Programmed Keys on each remaining key. This procedure is detailed in the Owners Guide.
  • Key in OFF position.
  • Cut a new encoded ignition key.
  • Key in ON position.
  • Program a new encoded ignition key; for additional information, refer to Key Programming-Erase All Key Codes and Program Two Keys .
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On-Demand Self-Test.
  • Is DTC B1602 retrieved?
H3 INSTALL A NEW PATS TRANSCEIVER Yes

REFER to Instrument Cluster Diagnostic Trouble Code (DTC) Index.

No

System is OK.
  • Key in OFF position.
  • Install a new PATS transceiver; for additional information, refer to Module-Passive Anti-Theft Transceiver .
  • Key in ON position.
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On-Demand Self-Test.
  • Are any DTCs retrieved?

PINPOINT TEST I: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - PATS TRANSCEIVER SIGNAL IS NOT RECEIVED (NOT CONNECTED, DAMAGED, OR WIRING)

Test Step Result / Action to Take
I1 USE THE DTCS FROM THE INSTRUMENT CLUSTER SELF TESTS Yes

GO to I2 .

No

System is OK.
  • Use the recorded results from the Instrument Cluster Continuous and On-Demand Self-Tests.
  • Is DTC B1681 retrieved?
I2 CHECK THE PATS TRANSCEIVER FOR VOLTAGE - CIRCUIT 20 (WH/LB) Yes

GO to I3 .

No

REPAIR Circuit 20 (WH/LB).

REPEAT the self-test. CLEAR the DTCs.
  • Key in OFF position.
  • Disconnect: PATS Transceiver C252.
  • Key in ON position.
  • Measure the voltage between PATS transceiver C252 Pin 2, Circuit 20 (WH/LB), harness side and ground.

  • Is the voltage greater than 9 volts?
I3 CHECK THE PATS TRANSCEIVER GROUND - CIRCUIT 397 (BK/WH) Yes

GO to I4 .

No

REPAIR Circuit 397 (BK/WH).

REPEAT the self-test. CLEAR the DTCs.
  • Key in OFF position.
  • Measure the resistance between PATS transceiver C252 Pin 1, Circuit 397 (BK/WH), harness side and ground.

  • Is the resistance less than 5 ohms?
I4 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT FOR VOLTAGE - CIRCUIT 1216 (GY/OG) Yes

GO to I6 .

No

GO to I5 .
  • Connect: PATS Transceiver C252.
  • Key in ON position.
  • Measure the voltage by back probing between PATS transceiver C252 Pin 3, Circuit 1216 (GY/OG), harness side and ground.

  • Is the voltage greater than 9 volts?
I5 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT FOR SHORT TO GROUND - CIRCUIT 1216 (GY/OG) Yes

GO to I6 .

No

CHECK Circuit 1216 (GY/OG) for short to ground. If the circuit is OK, INSTALL a new instrument cluster; for additional information, REFER to Section.

CYCLE the ignition key to RUN using two encoded ignition keys.

GO to Pinpoint Test J to initialize the module. REPEAT the selftest.

CLEAR the DTCs. If the circuit is not OK, REPAIR Circuit 1216 (GY/OG). CLEAR the DTCs. TEST the system for normal operation.
  • Key in OFF position.
  • Disconnect: PATS Transceiver C252.
  • Measure the resistance between PATS transceiver C252 Pin 3, Circuit 1216 (GY/OG), harness side and ground.

  • Is the resistance greater than 100 ohms?
I6 CHECK CIRCUIT 1216 (GY/OG) FOR OPEN Yes

GO to I7 .

No

REPAIR Circuit 1216 (GY/OG).

CLEAR the DTCs. TEST the system for normal operation
  • Key in OFF position.
  • Disconnect: PATS Transceiver C252.
  • Disconnect: Instrument Cluster C220a.
  • Measure the resistance between PATS transceiver C252 Pin 3, Circuit 1216 (GY/OG), harness side and instrument cluster C220a Pin 7, Circuit 1216 (GY/OG), harness side.

  • Is the resistance less than 5 ohms?
I7 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR VOLTAGE - CIRCUIT 1215 (WH/LG) Yes

GO to I9 .

No

GO to I8 .
  • Key in OFF position.
  • Connect: PATS Transceiver C252.
  • Connect: Instrument Cluster C220a.
  • Key in ON position.
  • Measure the voltage by back probing between PATS transceiver C252 Pin 4, Circuit 1215 (WH/LG), harness side and ground.

  • Is the voltage greater than 9 volts?
I8 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR OPEN - CIRCUIT 1215 (WH/LG) Yes

GO to I9 .

No

CHECK Circuit 1215 (WH/LG) for short to ground. If the circuit is OK, INSTALL a new instrument cluster; for additional information, REFER to Section.

CYCLE the ignition to RUN using two encoded ignition keys. GO to Pinpoint Test J to initialize the module. REPEAT the self-test.

CLEAR the DTCs. If the circuit is not OK, REPAIR Circuit 1215 (WH/LG). REPEAT the self-test.

CLEAR the DTCs
  • Key in OFF position.
  • Disconnect: PATS Transceiver C252.
  • Measure the resistance between PATS transceiver C252 Pin 4, Circuit 1215 (WH/LG), harness side and ground.

  • Is the resistance greater than 100 ohms?
I9 CHECK THE PATS TRANSMIT CIRCUIT FOR CORRECT OPERATION - CIRCUIT 1215 (WH/LG) Yes

GO to I10 .

No

CHECK Circuit 1215 (WH/LG) for continuity to instrument cluster C220aPin 8. If the circuit is OK, INSTALL a new instrument cluster; for additional information, REFER to Section.

CYCLE the ignition to RUN using two encoded ignition keys. GO to Pinpoint Test J to initialize the module. REPEAT the self-test.

CLEAR the DTCs. If the circuit is not OK, REPAIR Circuit 1215 (WH/LG). REPEAT the self-test.

CLEAR the DTCs.
  • Connect: PATS Transceiver C252.
  • Key in ON position.
  • Trigger the instrument cluster active command RF SIGNAL to ON.
  • Measure the voltage by back probing between PATS transceiver C252 Pin 4, Circuit 1215 (WH/LG), harness side and ground.

  • Does the voltage drop from greater than 9 volts to less than 1 volt when the instrument cluster active command is triggered on?
I10 CHECK THE PATS SYSTEM WITH A NEW PATS TRANSCEIVER INSTALLED Yes

GO to I11 .

No

System is OK.
  • Key in OFF position.
  • Install a new PATS transceiver; for additional information, refer to Anti-Theft-Passive Anti-Theft System (PATS) .
  • Key in ON position.
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On-Demand Self-Test.
  • Is DTC B1681 retrieved?
I11 CHECK THE PATS SYSTEM WITH NEW INSTRUMENT CLUSTER Yes

REPAIR Circuit 397 (BK/WH), 20 (WH/LB), 1215 (WH/LG), and 1216 (GY/OG). REPEAT the selftest.

CLEAR the DTCs.

No

If no DTCs are retrieved, the system is OK.

If other DTCs are retrieved, REFER to Instrument Cluster Diagnostic Trouble Code (DTC) Index.
  • Key in OFF position.
  • Install a new instrument cluster; for additional information, refer to Section. Cycle the ignition to RUN using two encoded ignition keys. Go to Pinpoint Test J to initialize the module. REPEAT the self-test. CLEAR the DTCs.
  • Key in ON position.
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On-Demand Self-Test.
  • Is DTC B1681 retrieved?

PINPOINT TEST J: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - PCM ID DOES NOT MATCH BETWEEN INSTRUMENT CLUSTER AND PCM

Test Step Result / Action to Take
J1 USE THE DTCS FROM THE INSTRUMENT CLUSTER SELF TESTS Yes

GO to J2 .

No

System is OK.
  • Use the recorded results from the Instrument Cluster Continuous and On-Demand Self-Tests.
  • Is DTC B2139 recorded?
J2 CLEAR PCM ID FROM INSTRUMENT CLUSTER AND PCM Yes

VERIFY PCM calibration is correct for the vehicle. If correct, REPEAT Step J2. If fault code persists, INSTALL a new instrument cluster; for additional information, REFER to Section. CYCLE the ignition to RUN using two encoded ignition keys. REPEAT Pinpoint Test J . CLEAR the DTCs. TEST the system for normal operation. If DTC B2139 still exists, INSTALL a new PCM; for additional information, REFER to Section. REPEAT the self-test. CLEAR the DTCs.

No

System is OK. CHECK for any other DTCs. REFER to the instrument cluster Diagnostic Trouble Code Index.
  • Carry out the security access procedure for the instrument cluster. For additional information, refer to Security Access- Procedure .
  • NOTE: DO NOT carry out ignition key code erase.
  • Select FSF card PARAMETER RESET command for instrument luster.
  • Use diagnostic card for PCM Active Command Keep Alive Memory Reset.
  • Key in OFF position.
  • Select FSF card PARAMETER RESET command for PCM.
  • Key in ON position.
  • Turn the ignition switch to RUN for three seconds.
  • Enter the following diagnostic mode on the diagnostic tool: Clear Continuous DTCs.
  • Key in OFF position.
  • Enter the following diagnostic mode on the diagnostic tool: Retrieve Continuous DTCs.
  • Is DTC B2139 retrieved?

PINPOINT TEST K: THE ANTI-THEFT SYSTEM DOES NOT OPERATE CORRECTLY - NVM CONFIGURATION FAILURE (NO PCM ID EXCHANGED BETWEEN INSTRUMENT CLUSTER AND PCM)

Test Step Result / Action to Take
K1 USE THE DTCS FROM THE INSTRUMENT CLUSTER SELF TESTS Yes

If DTC B2141 only is retrieved, GO to K2 .

If DTC U1147 is retrieved with DTC B2141, GO to Pinpoint Test C .

No

System is OK.
  • Use the recorded results from the Instrument Cluster Continuous and On-Demand Self-Tests.
  • Are any DTCs recorded?
K2 CARRY OUT KEEP ALIVE MEMORY RESET FROM PCM Yes

System is OK.

No

GO to K3 .
  • Use diagnostic card for PCM Active Command - Keep Alive Memory Reset.
  • Key in OFF position.
  • Key in ON position.
  • Leave the key in the run position for thirty seconds.
  • Key in OFF position.
  • Start the vehicle.
  • Does the vehicle start?
K3 RETRIEVE THE INSTRUMENT CLUSTER DTCS Yes

REPEAT K2. If the fault persists, verify the PCM calibration. If the calibration is OK, INSTALL a new instrument cluster. for additional information, REFER to Section. Cycle the ignition key to run using two encoded ignition keys. GO to Pinpoint Test J to initialize the module. REPEAT the self-test.

CLEAR the DTCs.

No

REFER to the DTC index.
  • Enter the following diagnostic mode on the diagnostic tool: Clear Continuous DTCs.
  • Key in OFF position.
  • Key in ON position.
  • Key in OFF position.
  • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster On- Demand Self-Test.
  • Is DTC B2141 retrieved?
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