Test V: LFC 72/DTC B2792 - Cross Link Between Firing Loops

PINPOINT TEST V: LFC 72/DTC B2792 - CROSS LINK BETWEEN FIRING LOOPS

V1:

V1-V3:

V3-V4:

V4-V5:

V5-V6:

V6-V8:

NOTE: The RCM will only display diagnostic trouble code B2792 as a continuous fault.

Normal Operation
The RCM monitors the air bag deployment circuits for a short to another deployment circuit. The RCM carries out this check only at startup, so an ignition cycle is required for any changes to take effect. This is a stored DTC fault only, not available during self test. During each ignition cycle, if the RCM detects a cross link fault on any deployment circuit, it will store diagnostic trouble code (DTC) B2792 in memory and flash lamp fault code (LFC) 72 on the air bag indicator. The RCM will also display the lowest priority device indicating the shorted component.

Fault Conditions
The RCM monitors for the following fault conditions:
- Deployment circuits shorted together

Possible Causes
Cross link between firing loops can be caused by:
- faulted wiring.
- a faulted RCM.