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

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

K1-K5:

K5-K8:

K8 Continued:

Normal Operation
The fire suppression module is hardwired to the instrument cluster 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 - 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 - is a continuous and on-demand DTC that sets if the fire suppression module detects an open or short to ground on the fire suppression indicator lamp circuit 2318 (LG/RD).

DTC B29B4 - 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.

Possible Causes
- Circuit 1203 (LG/RD) open
- Circuit 2318 (LG/RD) open or short to voltage
- Fire suppression module
- Instrument cluster