Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking and replacing the component
Replace the relay, 2/91.
Activate the relay for windshield wipers on.
If the function is OK the cause of the fault was a defective relay (open-circuit in the relay coil).

Other information:
- For further information about the fuses and relays, see the Wiring Diagram.





Was the function OK?

Yes - Fault Found

No - Checking the cables from the fusebox to the central electronic module (CEM)

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Checking the cables from the fusebox to the central electronic module (CEM)
Remove windshield wiper relay 2/91 from the fusebox base.
Check the relay base terminals. Check for contact resistance and oxidation.
Check the cable between relay base 2/91 terminal #2 and central electronic module (CEM) terminal #13. Check for an open-circuit.
Install the relay.
Activate the relay.

Other information:
- For further information about the fuses and relays, see the Wiring Diagram
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For information about signals, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.









Was the function OK?

Yes - Verification

No - Checking the cable for a short-circuit to ground

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Checking the cable for a short-circuit to ground
Remove windshield wiper relay 2/91 from the fusebox base.
Check the cable between relay base terminal #2 and ground. Check for a short-circuit to ground.
Remedy as necessary.
Replace the fusebox if no fault is found.

Other information:
- For further information about the fuses and relays, see the Wiring Diagram
- To access or replace the fusebox, see Relay and fusebox engine compartment, replacing Integrated Relay/Fusebox, Engine Compartment, Replacing
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For information about signals, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.










Continue - Verification

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Verification




Verification

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.
Activate the relay, windscreen wiper on.

Does it work?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking and replacing the component

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