Test U: The Air Bag Warning Indicator Is Never/Always On

PINPOINT TEST U: THE AIR BAG WARNING INDICATOR IS NEVER/ALWAYS ON

Normal Operation
The air bag warning indicator receives voltage through the instrument cluster (IC) when the ignition switch is in the START/RUN position. The instrument cluster (IC) monitors the control circuit 608 (BK/YE) and illuminates the air bag warning indicator based upon the air bag signal received from the restraints control module (RCM). The instrument cluster (IC) illuminates the air bag warning indicator when it receives an open (no ground) from the RCM on control circuit 608 (BK/YE). The instrument cluster (IC) turns off the air bag warning indicator if it receives a ground signal from the RCM on control circuit 608 (BK/YE).

- DTC B1869 (Lamp Air Bag Warning Indicator Circuit Open) - is a continuous and on-demand DTC that sets if the RCM detects an open or short to ground on the restraints indicator lamp circuit 608 (BK/YE).
- DTC B1870 (Lamp Air Bag Warning Indicator Circuit Short To Battery) - is a continuous and on-demand DTC that sets if the RCM detects a short to voltage on the restraints indicator lamp circuit 608 (BK/YE) during prove-out at key-on, or when the air bag warning indicator lamp is activated.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- RCM
- Instrument cluster (IC)

U1-U2:

U2-U5:

U5-U7:

U8-U9: