Ground (GND) Short

Ground (GND) short

Checking diagnostic trouble codes (DTCs)




- Ignition on.
If the malfunction is intermittent, it means that the malfunction has been registered at an earlier time but the malfunction no longer remains. Intermittent faults can occur for a number of different reasons. The fault is evaluated depending on how it occurs.
Check if the fault is permanent or intermittent.
Click on the VCT2000 symbol to read off the diagnostic trouble codes (DTCs).





Is the fault intermittent?

Yes - Troubleshooting procedure complete

No - Checking the signal cable

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Verification

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

- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
Check that the control of the roof is working in both directions.

Does operation of the roof work?

Yes - FAULT FOUND

No - Fault-tracing information

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Fault-tracing information
The fault must be diagnosed and remedied. As this is not the case, the fault-tracing has failed.
Exit fault-tracing or try again.

Do you want to exit fault-tracing?

Yes - Exit Fault-tracing

No - Checking diagnostic trouble codes (DTCs)

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Checking the signal cable




Check the cable between the position sensor and the Convertible Roof Module (CRM). Check for an open-circuit. Check for a short-circuit to ground.
- Check the connector. Check for contact resistance. Check for oxidation. Check for loose connections.
- Check the cable between the Convertible Roof Module (CRM) terminal #D17 (#A47) and position sensor 2 (rear roof section). Check for a short-circuit to ground or an open-circuit.
Replace the signal cable if a fault is found.
If no malfunctions were detected when checking the signal cable, try replacing position sensor.
Remedy as necessary.

Other information
- Signal specification Signal Specification, Convertible Roof Module (CRM)
- For information about the cable routing, see the relevant Wiring Diagram.
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - Replacing the control module

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Replacing the control module








If the fault has not been located after checking the signal lead, then it is probably an internal fault in the convertible roof module (CRM).
- Ignition off. Wait 1 minute.
- Cut off voltage feed to Convertible Roof Module (CRM) by removing the battery's plus cable.
Replace Convertible Roof Module (CRM).

Other information
- Signal specification Signal Specification, Convertible Roof Module (CRM)
- For information about the cable routing, see the relevant Wiring Diagram.
- Convertible Roof Module (CRM) Removal and Replacement





Continue - Verification

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