Signal Too Low

Signal too low

Checking components and wiring








- Disconnect any connection from the socket for the tow hitch connector
- Ignition off, wait for at least 1 minute
- Break the power supply to the trailer module (TRM) by disconnecting the battery negative lead
- Disconnect connector A from the trailer module (TRM).

Caution! Do not touch the terminal pins in the trailer module (TRM). There is a risk of static discharge which could damage the control module.

Check the connector to the trailer module (TRM) and the socket for the tow hitch connector. Check for damage to pins and terminals in the connectors.
Remedy as necessary.
Check the cable between the trailer module (TRM) and the socket for the tow hitch connector. Check for a short-circuit to ground.
Check the cable between trailer module (TRM) terminal #A10 and the socket for the tow hitch connector.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting Breakout Box, Trailer Module (TRM)
- Signal specification Signal Specification, Trailer Module (TRM)
- For further information about cable routing and terminals, see the wiring diagram
- Trailer module (TRM), replacing Trailer Module (TRM)
- Checking wiring and terminals Checking Wiring and Terminals

Select "Continue" when the fault has been remedied.

Continue - Verification

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Verification




Verification

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








- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds.
Read diagnostic trouble codes by clicking the VCT2000 symbol.
If the fault is intermittent, the fault has been remedied.





Is the fault intermittent?

Yes - Troubleshooting procedure complete

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 components and wiring

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