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

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

C1-C2:

C2-C4:

C5:

Normal Operation
During normal operation, the air bag warning indicator will illuminate continuously for approximately 6 seconds and then go out after the ignition switch is placed in the ON or START position and no air bag faults exist. The air bag warning indicator will remain illuminated continuously after 3 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 active with this DTC, the secondary air bag warning chime will be activated.

If the restraints control module (RCM) detects an air bag warning indicator failure in addition to another SRS failure, the RCM will send a signal to the instrument cluster module to produce 5 sets of 5 tone bursts.

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