Test L: The Fire Suppression System Indicator Is Never On (Police Vehicles Only)

PINPOINT TEST L: THE FIRE SUPPRESSION SYSTEM INDICATOR IS NEVER ON (POLICE VEHICLES ONLY)

Normal Operation
The fire suppression module is hardwired to the instrument cluster (IC) through circuit 2318 (LG/RD), and is grounded through circuit 1203 (LG/RD). If a fault occurs in the fire suppression system, DTCs are set and the fire suppression module grounds circuit 2318 (LG/RD) to illuminate the fire suppression system indicator.

- DTC B1921 (Air Bag Diagnostic Monitor Ground Circuit Open) - is a continuous and on-demand DTC that sets if the fire suppression module detects an open or high resistance on the ground circuit 1203 (BK/LB).
- DTC B29B3 (Fire Suppression Indicator Lamp Circuit Failure) - is a continuous and on-demand DTC that sets if the fire suppression module detects an open on the fire suppression indicator lamp circuit 2318 (LG/RD).
- DTC B29B4 (Fire Suppression Indicator Lamp Circuit Short to Battery) - sets if the fire suppression module detects a short to voltage on the fire suppression indicator lamp circuit 2318 (LG/RD) during prove-out at key-on, or when the fire suppression indicator lamp is activated.

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

L1-L2:

L2-L5:

L5-L8:

L8 Continued: