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-K4:

K4-K6:

K7-K8:

Normal Operation
The fire suppression module (FSM) 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, a diagnostic trouble code(s) are set and the FSM grounds circuit 2318 (LG/RD) to illuminate the fire suppression system indicator.

Possible Causes
- circuit 1203 (LG/RD) open
- circuit 2318 (LG/RD) open or short to voltage
- FSM
- instrument cluster