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 according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Check for damage carefully.
Check the wiring between rear control module terminal #B21 (#E1) and the ground terminal for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- To access the rear control module connector, see Integrated relay/fusebox 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).





Continue - Verification

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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 - Verification completed

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

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