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SPN 1045 — Stop Lamp Switch #1

Safe to driveDrivable, but watch it yourself

J1939 code SPN 1045. Below — how the fault is worded at the factory by Bendix ABS/ESP, Renault Trucks and WABCO ABS/ESC, and what the second half of the code (FMI) means in the standard.

Bendix ABS/ESPRenault TrucksWABCO ABS/ESC

Bendix ABS/ESP

FMI 2Stop Lamp Switch Defective
FMI 4Brake Lamp Input Mismatch with Brake Lamp Output
FMI 7Stop Lamp Switch Not Detected

Renault Trucks

FMI 7VECU communication channel fault (the “stop brake switch” message is missing). Repair: Make sure the VECU actually sends messages over the CAN data bus. Check the continuity of the CAN data bus wiring (X1/1, X1/2).

WABCO ABS/ESC

FMI 3E401 and E404 Version Only. Pressure Sensor Shorted to UBATT; Pressure Sensor Shorted to UBATT
FMI 5E401 and E404 Version Only. Pressure Sensor Shorted to Ground; Pressure Sensor Shorted to Ground
FMI 7CAN BLS (Brake light Switch) Signal Faulty

What FMI means in J1939

SPN 1045 FMI 21045/2 · 1045.2data erratic or intermittent
SPN 1045 FMI 31045/3 · 1045.3voltage above normal or shorted high
SPN 1045 FMI 41045/4 · 1045.4voltage below normal or shorted to ground
SPN 1045 FMI 51045/5 · 1045.5current below normal or open circuit
SPN 1045 FMI 71045/7 · 1045.7mechanical system not responding

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Drivable, but watch it yourself

This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.

You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.

Nearby: other

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