Ford Mustang Service Manual: Pinpoint Test J: LFC 34/DTC B1934 - Driver Air Bag Circuit Resistance Low
Pinpoint Test A: The Air Bag Warning Indicator Is Illuminated Continuously - RCM Disconnected, Inoperative or Lost/Low Ignition Feed
Normal Operation
NOTE: During normal operation the air bag indicator will be lit continuously for 6 seconds after the ignition switch is placed in the RUN position and after five cycles of a lamp fault code (LFC) if a fault exists. Be sure to cycle the ignition switch and look for a 6 second indicator prove-out without LFCs.
The restraints control module (RCM) will communicate diagnostic trouble codes (DTCs) to the scan tool through the data link connector (DLC). If the scan tool displays NO COMMUNICATION when retrieving continuous DTCs, Go To Pinpoint Test P to troubleshoot the system.
Possible Causes
An air bag indicator that is illuminated continuously can be caused by one of the following:
- worn or damaged shorting bar or camming beam.
- the ignition circuit damaged.
- the RCM disconnected from the vehicle harness.
- a loss of RCM ground circuits.
- the RCM inoperative.
- circuitry.
PINPOINT TEST A: THE AIR BAG WARNING INDICATOR IS ILLUMINATED CONTINUOUSLY - RCM DISCONNECTED, INOPERATIVE, OR LOST/LOW IGNITION FEED
Test Step | Result / Action to Take |
A1 CHECK FOR CONTINUOUS OR ON-DEMAND SELF TEST DTCs | Yes If continuous DTCs were retrieved, GO to A3 . If on-demand DTCs were retrieved, GO to the Restraints Control Module (RCM) Diagnostic Trouble Code (DTC) Priority Table in this section for pinpoint test direction. No GO to A2 . |
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A2 CHECK THE RCM CONNECTION | Yes GO to A3 . No CONNECT C2041 and engage the locking tabs. GO to A7 . |
WARNING: If the supplemental restraint system
(SRS) is
being serviced, the system must be deactivated and restraint
system diagnostic tools must be installed. Refer to Air Bag
Supplemental Restraint System (SRS) in this section. The air bag restraint system diagnostic tools must be removed and the air bag modules reconnected when the system is reactivated to avoid non-deployment in a collision, resulting in possible personal injury. NOTE: Diagnostics or repairs are not to be performed on a seat equipped with a seat side air bag with the seat in the vehicle. Prior to attempting to diagnose or repair a seat concern when equipped with a seat side air bag, the seat must be removed from the vehicle and the restraint system diagnostic tools must be installed in the seat side air bag electrical connectors. The restraint system diagnostic tools must be removed prior to operating the vehicle over the road. NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road. NOTE: After diagnosing or repairing a seat system, the restraint system diagnostic tools must be removed before operating the vehicle over the road. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
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A3 CHECK THE RCM CONNECTOR | Yes CORRECT connector concerns. GO to A7 . No GO to A4 . |
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A4 CHECK THE IGNITION CIRCUIT 611 (WH/OG) FOR AN OPEN | Yes GO to A5 . No REPAIR the circuit. GO to A7 . |
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A5 CHECK THE GROUND CIRCUIT 397 (BK/WH) FOR AN OPEN | Yes GO to A6 . No REPAIR the circuit. GO to A7 |
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A6 CHECK CIRCUIT 608 (BK/YE) FOR A SHORT TO GROUND | Yes REPAIR the circuit. GO to A7 . No INSTALL a new RCM. GO to A7 . |
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A7 CHECK FOR ADDITIONAL DTCs | Yes Do not clear any DTCs until all DTCs have been resolved. GO to the Restraints Control Module (RCM) Diagnostic Trouble Code (DTC) Priority Table in this section for pinpoint test direction. No RECONNECT the system. REACTIVATE the system. PROVE OUT the system. REFER to Air Bag Supplemental Restraint System (SRS) in this section. CLEAR all DTCs. |
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Pinpoint Test I: LFC 33/DTC B1933 - Passenger Air Bag Circuit Resistance
High
Pinpoint Test A: The Air Bag Warning Indicator Is Illuminated Continuously
- RCM
Disconnected, Inoperative or Lost/Low Ignition Feed
Normal Operation
NOTE: During normal operation the air bag indicat ...
Pinpoint Test K: LFC 35/DTC B1935 - Passenger Air Bag Circuit Resistance
Low
Pinpoint Test A: The Air Bag Warning Indicator Is Illuminated Continuously
- RCM
Disconnected, Inoperative or Lost/Low Ignition Feed
Normal Operation
NOTE: During normal operation the air bag indicat ...
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