Signal Outside Its Permitted Range

Signal outside its permitted range

Checking the stop lamp switch connectors




- Ignition on
- Read off the status of the stop lamp switch.
Depress and release the brake pedal. The value must change between OFF and ON.
If the value changes, the cause of the fault was a loose connection in the stop lamp switch connectors.





Does the value change?

Yes - If the value changes, the cause of the fault was a loose connection in the stop lamp switch connectors

No - Checking the power supply

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Checking the power supply




- Ignition on.
Check the power supply to the stop lamp switch. Take readings between stop lamp switch terminal #2 (cable harness side) and the ground terminal. The power supply must be approximately 12 V.
If the power supply is missing, check the power supply circuit for stop lamp switch terminal #2 (cable harness side). Check for an open-circuit. Check for a short-circuit to ground. Check for a blown fuse in the circuit.
Remedy as necessary.

Other information
- To connect the breakout box, brake control module (BCM), see: Connecting the breakout box Connecting the Breakout Box, Brake Control Module (BCM)
- To connect the breakout box, engine control module (ECM), see: Connecting the breakout box, B5254T7 Connecting The Breakout Box, Engine Control Module (ECM)
- To connect the breakout box, central electronic module (CEM), see: Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For signal specification, engine control module (ECM), turbocharged engines: Signal specification, B5254T7 Signal Specification, Engine Control Module (ECM)
- For further information about the locations of fuses and relays, see the Wiring Diagram
- Stoplamp switch Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - Checking the component and wiring

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Checking the component and wiring




- Ignition off
- Check that the stop lamp switch is correctly installed.
Check the resistance of the stop lamp switch with the switch pressed in and with the switch released. Take readings between terminals #1 and #2 (component side) on the stop lamp switch.

Hint: The stop lamp switch must be closed when the brake pedal is depressed. The resistance of the stop lamp switch must be infinite when the brake pedal is unaffected.

Check the stop lamp switch and engine control module (ECM) connectors. Check for contact resistance. Check for oxidation.
Check the cable between stop lamp switch terminal #1 (cable harness side) and engine control module (ECM) terminal #B41 (#C41). Check for loose connections. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Remedy as necessary.

Other information
- To connect the breakout box, brake control module (BCM), see: Connecting the breakout box Connecting the Breakout Box, Brake Control Module (BCM)
- To connect the breakout box, engine control module (ECM), see: Connecting the breakout box, B5254T7 Connecting The Breakout Box, Engine Control Module (ECM)
- To connect the breakout box, central electronic module (CEM), see: Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For signal specification, engine control module (ECM), turbocharged engines: Signal specification, B5254T7 Signal Specification, Engine Control Module (ECM)
- For further information about the locations of fuses and relays, see the Wiring Diagram
- Stoplamp switch Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Continue - Verification

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Verification




- Ignition off
- Reinstall the components, connectors, etc.
- Ignition on
- Read off the status of the stop lamp switch.
Depress and release the brake pedal. The value must change between OFF and ON.





Does the value change?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the stop lamp switch connectors

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