Test L: The Fire Suppression System Indicator Is Always On (Police Vehicles Only)

PINPOINT TEST L: THE FIRE SUPPRESSION SYSTEM INDICATOR IS ALWAYS ON (POLICE VEHICLES ONLY)

L1-L2:

L2-L4:

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, a DTCs are set and the fire suppression module grounds circuit 2318 (LG/RD) to illuminate the fire suppression system indicator. The fire suppression module connector is equipped with a shorting bar that will ground circuit 2318 (LG/RD) when the fire suppression module is disconnected to illuminate the fire suppression system indicator.

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 (FSIL) circuit 2318 (LG/RD).

Possible Causes
- Circuit 2318 (LG/RD) short to ground
- Fire suppression module
- Instrument cluster