Signal Too Low

Signal too low

Checking the power supply




- Ignition on
- Read off the power supply for the rear electronic module (REM) and the central electronic module (CEM).
The voltage for the rear electronic module (REM) and the central electronic module (CEM) must be approximately the same.
The fault is permanent if the voltage for the rear electronic module (REM) deviates by more than 3 V from the central electronic module (CEM).
If the voltage is approximately the same, this indicates an intermittent fault, i.e. the fault was present previously but is not active at the moment.














Continue - Checking cable and component

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Checking cable and component
Check the connectors for the rear electronic module (REM). Check for contact resistance and oxidation.
Check the terminals for the power supply (30-supply) from the battery to the rear electronic module (REM) (screw terminal). Check for contact resistance and oxidation. Also check the terminals for the fuse to the actual rear electronic module (REM). For information about fuses, see the relevant Wiring Diagram.
Check the ground terminal from the rear electronic module (REM) terminal #12 (#D12) and ground terminal. Check for contact resistance and oxidation.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting Breakout Box, Rear Electronic Module (REM)
- Signal specification Signal Specification, Rear Electronic Module (REM)
- Disconnecting the rear electronic module (REM): Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals










Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Read off the power supply for the rear electronic module (REM) and the central electronic module (CEM).
The voltage for the rear electronic module (REM) and the central electronic module (CEM) must be approximately the same (a maximum difference of 3 V).





Is the voltage OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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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 - FAULT-TRACING FAILED

Attempt New Test - Checking the power supply

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