Ford Mustang (1999-2004) Service Manual: Pinpoint Test M: DTC B1891 - Air Bag Tone Warning Indicator Circuit Shorted to Battery or Ignition
Normal Operation
The restraints control module (RCM) monitors its connection to the generic electronic module (GEM) at pin 10. This connection is used to signal a chime if the air bag indicator is inoperative and another SRS fault exists. If the RCM detects a short to battery or ignition on the connection to the GEM, it will store a diagnostic trouble code (DTC) B1891 in memory.
Possible Causes
An air bag tone warning indicator circuit short to battery or ignition can be caused by:
- a short to battery or ignition on circuit 1083 (LB/BK).
- a damaged or inoperative GEM.
- an RCM internal concern.
PINPOINT TEST M: DTC B1891 - AIR BAG TONE WARNING INDICATOR CIRCUIT SHORTED TO BATTERY OR IGNITION
Test Step | Result / Action to Take |
M1 CHECK FOR A HARD OR INTERMITTENT DTC | Yes This is a hard fault. The fault condition is still present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. GO to M2 . No This is an intermittent fault. The fault condition is not present at this time. GO to M4 . |
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M2 CHECK THE AIR BAG TONE WARNING INDICATOR CIRCUIT | Yes GO to M3 . No REPAIR the circuit. GO to M5 . |
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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M3 CHECK THE AIR BAG TONE WARNING INDICATOR | Yes INSTALL a new RCM. GO to M5 . No INSTALL a new GEM. GO to M5 |
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M4 CHECK FOR AN INTERMITTENT FAULT | Yes Check for causes of intermittent short to ground or open on circuit 1083 (LB/BK). Attempt to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. GO to M5 . No GO to M5 . |
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|
M5 CHECK FOR ADDITIONAL DTCs | YesDo 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 L: B1892 - Air Bag Tone Warning Indicator Circuit Shorted to Ground or Open
Normal Operation The restraints control module (RCM) monitors its connection to the generic electronic module (GEM) at C201e pin 10. This connection is used to signal a chime if the air bag indi ...Pinpoint Test N: DTC B1869 - Air Bag Indicator Inoperative
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