Test T: DTC B1870 - Air Bag Indicator Short to Battery

Pinpoint Test T1:

Pinpoint Test T2:

Pinpoint Test T3-T4:

Pinpoint Test T: DTC B1870 Air Bag Indicator Short to Battery

Normal Operation

The air bag indicator is designed to illuminate for 6 (+/-2) seconds when the ignition switch is turned to the RUN 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 Supplemental Restraint System (SRS).

The air bag Electronic Crash Sensor (ECS) module monitors the air bag indicator for short to battery conditions. If the ECS 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 ECS detects an air bag indicator failure in addition to another SRS failure, the ECS will send a signal to the Generic Electronic Module (GEM) 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 608 (BK/YE).
- an instrument cluster malfunction.
- a damaged or inoperative ECS module.