Signal Missing

Signal missing

Checking the power supply and ground terminal




- Ignition off.
Check that the wiper motor fuse in the engine compartment fusebox (F17) is intact. If the fuse is blown, check the subsequent circuit for a short-circuit to ground. Then replace the fuse.
Check the cable between the engine compartment fusebox and the wiper motor module (WMM). Check for an open-circuit.
Check the cable between wiper motor module (WMM) terminal #A2 and ground. Check for an open-circuit. Also check the ground terminal for oxidation.
Check the signal cable between central electronic module (CEM) terminal #G3 (#3) and wiper motor module (WMM) terminal #A1. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Remedy the cables as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- Control module relay box passenger compartment Service and Repair
- Wiper mechanism, windshield Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals





Was a fault detected?

Yes - Verification

No - Replacing the control module

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Replacing the control module




- Ignition off.
If no fault is discovered on the cables for the control module, the wiper motor module (WMM) will probably need to be replaced.

Other information
- Wiper mechanism, windshield Service and Repair

Continue - Verification

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Verification




Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Check the function of the wiper motor. Switch on the wiper function using the wiper control stalk.
The wipers must function at all speeds.

Do the wipers start?

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 power supply and ground terminal

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