B1993

Pinpoint Test 19: LFC 36/DTC B1993 - Driver-Side Air Bag Circuit Shorted to Ground

Normal Operation
The restraints control module (RCM) monitors the resistance to ground at RCM S-2041 a and S-2041 b, pins 2 and 3. If the resistance is less than 1000 Ohm at either pin, the RCM will interpret that as a ground short, store diagnostic trouble code (DTC) B1993 and flash lamp fault code (LFC) 36.

Possible Causes
A driver-side air bag circuit short to ground can be caused by:
- grounded wiring on circuit (W/LB).
- damaged wiring on circuit (BR/LB).
- ground short in the driver-side air bag module.
- an RCM internal concern.

WARNING: The air bag diagnostic tool is for restraint system repair only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.

NOTE: If a seat equipped with a seat-mounted side air bag and/or a safety belt pretensioner (if equipped) system is being serviced, the air bag system must be deactivated using the appropriate deactivation procedure in this section.

NOTE: Restraint system diagnostic tools MUST be installed under the seats in the side air bag and safety belt pretensioner to floor connectors.

NOTE: Diagnostics or repairs are not to be performed on a side air bag system and/or a safety belt pretensioner (if equipped) system with the seats in the vehicle. Prior to attempting to diagnose/repair the side air bag system and/or safety belt pretensioner (if equipped) system the seats must be removed from the vehicle and the restraint system diagnostic tools must be installed in the side air bag and the safety belt pretensioner (if equipped) connectors at the floor connectors.
The restraint system diagnostic tools must be removed prior to operating the vehicle over the road.

NOTE: Diagnostics may be performed on seat Systems other than the side air bag or the safety belt pre-tensioner (if equipped) system (lumbar, climate controlled, heated, power seat track) with the seat installed in the vehicle as long as the restraint system diagnostic tools are installed under the seats in the side air bag and safety belt pretensioner to floor connectors.

NOTE: After diagnosing/repainng a seat system, the restraint system diagnostic tools must be removed before operating the vehicle over the road.

Step 1 - 2:

Step 3 - 4:

Step 5 - 6:

TEST DESCRIPTION