Signal Missing

Signal missing

Checking diagnostic trouble codes (DTCs) in the central electronic module
If there are diagnostic trouble codes (DTCs) stored in the central electronic module for communication problems or for the back-up (reversing) lamp, these must be fault traced first.

Were diagnostic trouble codes (DTCs) stored for communication problems or for the back-up (reversing) lamp in the central electronic module?

Yes - These DTCs must be fault traced first before continuing

No - Checking the transmission

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Checking the transmission

Is the car equipped with automatic transmission?

Yes - Checking wiring and terminals (automatic transmissions)

No - Checking back-up (reversing) lamp switch

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Checking wiring and terminals (automatic transmissions)




- Ignition off.
Check the brake control module and transmission control module (TCM) connectors. Check for damaged or bent terminal pins. Check for contact resistance and oxidation.
Check the wiring for CAN communication between brake control module terminal #11 (#A11) and terminal #2 (#B12) on the transmission control module (TCM) and between brake control module terminal #15 (#A15) and terminal #14 (#B24) on the transmission control module (TCM). 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 to the brake control module, see Connecting the breakout box, brake control module (BCM) Connecting the Breakout Box
- To fault-trace the wiring and connections, see Checking wiring and terminals Checking Wiring And Terminals.

Continue - Verification

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Signal too low. Permanent fault

Checking back-up (reversing) lamp switch




- Ignition off.

Hint: Check the back-up (reversing) light switch resistance between connector 54/1 terminal #24 and ground with gears 1 to 5 engaged. Resistance should be high.

The back-up gear switch should be open in all gear positions except back-up gear.
Remedy as necessary.

Other information:
- To access the back-up (reversing) lamp switch, see Back-up lamp switch, replacing Service and Repair.









Was a fault detected?

Yes - Verification

No - Checking the cable

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Checking the cable
Check the cable between the central electronic module (CEM) terminal #1A and the back-up (reversing) lamp switch terminal #2 (3/10). Check for a short-circuit to ground.
Remedy as necessary.

Other information:
- For information about the central electronic module (CEM), see Central electronic module (CEM), replacing
- To access the back-up (reversing) lamp switch, see Back-up lamp switch, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.













Was a fault detected?

Yes - Verification

No - Replacing the component

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Replacing the component
Try replacing the back-up (reversing) lamp switch.

Other information:
- To access the back-up (reversing) lamp switch, see Back-up lamp switch, replacing Service and Repair.





Continue - Verification

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Verification




Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off.
- Connect connectors, install components etc.
- Ignition on.
Reversing light should not come on when gears 1 to 5 are selected.

Does it work?

Yes - Verification completed

No - Fault-tracing information

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Fault-tracing information




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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Verification




Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Test drive the car. See Test Drive Form (DSTC (dynamic stability and traction control) /brake control module), description Test Drive Form (DSTC (Dynamic Stability And Traction Control) /Brake Control Module), Description
- Ignition on.
Read off the status of the diagnostic trouble code (DTC).





Is the status of the diagnostic trouble code (DTC) intermittent?

Yes - Verification completed

No - Fault-tracing information

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Fault-tracing information




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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