Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking and replacing the component
Remove the relay 2/120 and check the relay socket's contacts for contact resistance and oxidation. Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Install the relay.
Activate the relay with the switch child safety lock, for windows rear doors, on the driver's control panel (activated relay LED on).
If the function is now OK the fault was caused by a contact fault in the relay base.

Other information
- Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing





Was the function OK?

Yes - Verification

No - Replacing the component

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Replacing the component
Replace relay, 2/120.
Activate the relay with the switch child safety lock, for windows rear doors, on the driver's control panel (activated relay LED on).
If the function is OK the cause of the fault was a damaged relay (open circuit/short-circuiting in the relay coil).

Other information
- Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing





Was the function OK?

Yes - Fault Found

No - Fault-tracing

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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 relay for child safety blocking on window of rear door up/down, using control panel on driver door (activated relay diode illuminates). Activate window of rear door up/down using control panel in rear door.

Does it work?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing

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Fault-tracing




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 - FAULT-TRACING FAILED

Attempt New Test - Checking and replacing the component

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