Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the power supply




- Ignition off.

Check the voltage to ground at the following points:
Main fuse rear no. 1 (11E7)
Rear fuse no. 1 (11D1)
The voltage must be at least battery voltage minus 3 V.
Check that the fuses are intact.
Remedy as necessary.









Was the fault found?

Yes - Verification

No - Checking the power supply and ground at the rear control module

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Checking the power supply and ground at the rear control module
Check the voltage to ground at rear control module terminal #B26 (#E6). The voltage must be at least battery voltage minus 3 V.
Check the control module connector. Check for contact resistance and oxidation. Check for loose connections. Check for damage carefully.
Check the wiring between rear control module terminal #B21 (#E1) and the ground terminal. Check for an open-circuit.
Remedy as necessary.

Other information:
- To access the rear control module connector, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- To connect the breakout box, see Connecting the breakout box Connecting Breakout Box, Rear Electronic Module (REM)
- 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.
- Install the components, connect the connectors, etc.
- Ignition on.
Read the excitation voltage to rear electronic module (REM).
Voltage should be at least battery voltage minus three volts.





Is voltage OK?

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 the power supply

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