Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test J: The Fire Suppression System Module (FSSM) Does Not Respond To The Scan Tool
Refer to appropriate SYSTEM WIRING DIAGRAMS article, Module Communications Network for schematic and connector information.
Refer to appropriate SYSTEM WIRING DIAGRAMS article, Police Option for schematic and connector information.
Normal Operation
The fire suppression system module (FSSM) (if equipped) communicates with the scan tool through the international standards organization (ISO) 9141 network circuit 70 (LB/WH). The FSSM 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 FSSM 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
- FSSM
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.