Test J: The Fire Suppression Module Does Not Respond To The Scan Tool

PINPOINT TEST J: THE FIRE SUPPRESSION MODULE DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The fire suppression module communicates with the scan tool through the international standards organization (ISO) 9141 network circuit 70 (LB/WH). The fire suppression module also communicates with the PCM via the high speed controller area network (HS-CAN) circuits 1827 (WH/LG) and 1828 (PK/LG). Voltage for the fire suppression module is supplied on circuit 2319 (RD/YE). Ground is supplied through the module chassis and through circuit 1203 (BK/LB).

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Fire suppression module

WARNING:
- Do not reuse steering column shaft bolts. This may result in fastener failure and steering column shaft detachment or loss of steering control. Failure to follow this instruction may result in serious injury to vehicle occupant(s).
- Before servicing a vehicle equipped with a fire suppression system, depower the system by following the procedure in Fire Suppression System. Failure to follow the instructions may result in serious personal injury.
- If equipped with fire suppression system, refer to Fire Suppression System for Important Safety Warnings. Failure to follow this instruction may result in serious personal injury.
- The fire suppression system backup power supply must be depleted before lifting the vehicle or when repairing or replacing any of the following:
- Fire suppression system components
- Components located near the fire suppression manual switch
- Fuel tank and components located near the fuel tank
- Rear axle and components located near the rear axle

To deplete the backup power supply, disconnect the battery and wait at least 1 minute. Be sure to disconnect all auxiliary batteries and power supplies (if equipped). Failure to follow these instructions may result in serious personal injury.

- To reduce the risk of accidental deployment, do not use any memory saver devices when depowering the fire suppression system. Failure to follow this instruction may result in serious personal injury.
- If the vehicle is equipped with a fire suppression system, disconnect the battery before anyone gets under the vehicle or near the rear axle area. You could unintentionally deploy the fire suppression system. Failure to follow these instructions may result in serious personal injury.
- The tightening torque of the fire suppression module (FSM) bolts and the FSM orientation on the body of the vehicle is critical for correct system operation. Always tighten and orient the FSM per specifications. Failure to do so may result in incorrect fire suppression system operation, which increases the risk that it will not protect vehicle occupant(s).
- To reduce the risk of accidental deployment, never probe the connectors on the fire suppressors. Failure to follow this instruction may cause unintentional deployment of the suppressors, which may result in serious personal injury.

J1:

J2-J4:

J5-J6: