Ford Mustang (1999-2004) Service Manual: Inspection and Verification
1. The interior lighting system is a generic electronic module (GEM) controlled system.
2. Verify the customer concern by operating the interior lighting system.
3. Visually inspect for the following obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Mechanical | Electrical |
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4. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan 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.
5. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
6. Carry out the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with:
- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section .
- NO RESP/NOT EQUIP for GEM, 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 GEM.
7. If the DTCs retrieved are related to the concern, go to GEM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
8. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.
GEM Diagnostic Trouble Code (DTC) Index
DTC | Description | Source |
B1322 | Driver Door Ajar Circuit Short to Ground | GEM |
B1330 | Passenger Door Ajar Circuit Short to Ground | GEM |
B1334 | Decklid Ajar Rear Door Circuit Short to Ground | GEM |
B1342 | ECU Is Defective | GEM |
B1397 | Power Door unlock Circuit Short to Battery | GEM |
B1405 | Driver Power Window Down Circuit Short to Battery | GEM |
B1408 | Driver Power Window Up Circuit Short to Battery | GEM |
B1410 | Driver Power Window Motor Circuit Failure | GEM |
B1426 | Lamp Safety Belt Circuit Short to Battery | GEM |
B1428 | Lamp Safety Belt Circuit Failure | GEM |
B1431 | Wiper Brake/Run Relay Circuit Failure | GEM |
B1432 | Wiper Brake/Run Relay Circuit Short to Battery | GEM |
B1434 | Wiper Hi/Low Speed Relay Coil Circuit Failure | GEM |
B1436 | Wiper Hi/Low Speed Relay Coil Circuit Short to Battery | GEM |
B1438 | Wiper Mode Select Switch Circuit Failure | GEM |
B1441 | Wiper Mode Select Switch Circuit Short to Ground | GEM |
B1446 | Wiper Park Sense Circuit Failure | GEM |
B1448 | Wiper Park Sense Circuit Short to Battery | GEM |
B1450 | Wiper Wash/Delay Switch Circuit Failure | GEM |
B1453 | Wiper Wash/Delay Switch Circuit Short to Ground | GEM |
B1458 | Wiper Washer Pump Motor Relay Circuit Failure | GEM |
B1460 | Wiper Washer Pump Motor Relay Coil Circuit Short to Battery | GEM |
B1462 | Safety Belt Switch Circuit Failure | GEM |
B1466 | Wiper Hi/Low Speed Not Switching | GEM |
B1473 | Wiper Low Speed Circuit Motor Failure | GEM |
B1476 | Wiper High Speed Circuit Motor Failure | GEM |
B1551 | Decklid Release Circuit Failure | GEM |
B1553 | Decklid Release Circuit Short to Battery | GEM |
B1555 | Ignition Run/Start Circuit Failure | GEM |
B1687 | Lamp Dome Input Circuit Short to Battery | GEM |
B2486 | LF Side Repeater Lamp Output Circuit Failure | GEM |
B2488 | RF Side Repeater Lamp Output Circuit Failure | GEM |
C1189 | Brake Fluid Level Sensor Input Short Circuit to Ground | GEM |
C1223 | Lamp Brake Warning Output Circuit Failure | GEM |
C1225 | Lamp Brake Warning Output Circuit Short to Battery | GEM |
Symptom Chart
Condition | Possible Sources | Action |
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Principles of Operation
Battery Saver The battery saver feature provides automatic shut-off of power to demand and courtesy lamp circuitry. When the generic electronic module (GEM) detects the ignition switch circuits ...Pinpoint Tests
CAUTION: Before removing and installing the GEM or its connectors, disconnect the battery. Failure to follow this caution will result in the GEM storing many erroneous DTCs and may result in the ...Other materials:
Dual Converter H-Pipe - 4.6L (2V and 4V)
Removal
NOTE: The RH and LH catalytic converters are serviced separately.
1. Raise and support the vehicle. For additional information, refer to
Section.
2. CAUTION: When repairing exhaust system or removing the exhaust
components,
disconnect all heated oxy ...
Instrument Cluster Self-Diagnostic Mode
To enter the instrument cluster self-diagnostic mode, press and hold the
instrument cluster
SELECT/RESET button, turn the ignition switch to the RUN position, and then
continue pressing the
SELECT/RESET button (five seconds) until tESt is displayed in th ...
Removal
Automatic transmission vehicles
1. Remove the flexplate. For additional information, refer to Flexplate in
this section.
Manual transmission vehicles
2. Remove the flywheel. For additional information, refer to Flywheel in this
section.
All vehicles
3. Using ...