V: LFC 36/DTC B1993 - Driver Air Bag Circuit Short to Ground

Normal Operation
The Restraints Control Module (RCM) monitors the resistance to ground at RCM C1 pins 2 and 3. If the resistance is less than 1000 ohms 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 1257 (WH/LB).
- damaged wiring on circuit 1258 (BN/LB).
- ground short in the driver side air bag module.
- an RCM internal concern.

Pinpoint Test Steps:

V1:

V2 - V3:

V4:

V5:

V6 - V7:

V8: