B1870

DTC B1870 (Steps 1 - 4):

DTC B1870 (Step 5):

Normal Operation
The air bag indicator is designed to illuminate for 6 (±2) seconds when the ignition switch is turned to the ON position. This initial 6 seconds of illumination is considered normal operation and is called proveout of the air bag indicator. The air bag indicator is then used to warn the driver that there is a fault in the air bag system.

While the air bag indicator is lit, the air bag diagnostic monitor monitors the air bag indicator for open and short to ground conditions. If the air bag diagnostic monitor detects an open or short to ground condition on the air bag indicator circuit, it will store a diagnostic trouble code (DTC) B1870 in memory.

If the diagnostic monitor detects an air bag indicator failure in addition to another air bag system failure, the air bag diagnostic monitor will send a signal to the Generic Electronic Module (GEM) to produce five sets of five tone bursts.

Possible Causes
An air bag indicator inoperative condition could be caused by:
- A short to battery on (B/Y) wire.
- An instrument cluster malfunction.