Tests AI: DTC B1870 - Air Bag Indicator Shorted to Battery

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Normal Operation
The air bag indicator is designed to illuminate for 6 seconds when the ignition switch is turned to the RUN position. This is considered normal operation and is called SRS prove out the air bag indicator is used to warn the driver that there is a fault in the (SRS).

The Restraints Control Module (RCM) monitors the air bag indicator for short to battery conditions. If the RCM detects a short to battery condition on the air bag indicator circuit, it will store a Diagnostic Trouble Code (DTC) B1870 in memory.

If the RCM detects an air bag indicator failure in addition to another SRS failure, the RCM will send a signal to the air bag tone warning indicator to produce five sets of five tone bursts.

Possible Causes
An air bag indicator short to battery condition can be caused by:
^ damaged wiring on circuit 31S-JA14.
^ an instrument cluster concern.
^ RCM is faulted.