Test C: DTC B1870 - Air Bag Warning Indicator Circuit Short to Battery

PINPOINT TEST C: DTC B1870 - AIR BAG WARNING INDICATOR CIRCUIT SHORT TO BATTERY

C1-C3:

C3-C5:

Normal Operation
During normal operation, the air bag indicator will illuminate continuously for approximately 6 seconds and then go out after the ignition switch is placed to the ON or START and no air bag fault exists.

The air bag indicator will remain illuminated continuously after five cycles of a lamp fault code (LFC), if a fault exists. If the restraints control module detects a short to battery on the air bag warning indicator circuit, it will store diagnostic trouble code (DTC) B1870 in memory. If any other DTCs are detected with this DTC active, the secondary air bag warning will be activated

Possible Causes
An air bag indicator circuit short to battery can be caused by:
- damaged wiring, terminals, or connectors.
- a faulted RCM.
- a faulted instrument cluster module.