Signal Missing

Signal missing

Checking the function of the upper electronic module (UEM)
Check that the upper electronic module (UEM) is powered by switching on one of the rear reading lamps.





Does one of the rear reading lamps light?

Yes - Checking communication with the upper electronic module (UEM)

No - Checking the power supply and ground for the upper electronic module (UEM)

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Checking the power supply and ground for the upper electronic module (UEM)
Check that the fuse for the control module is intact.
For further information about the fuse and terminal pin numbers, see the Wiring Diagram.
Check the power supply and ground for the upper electronic module (UEM) as follows.
Remedy as necessary.

Other information:
- Checking the ground terminal Checking Ground Terminal For The Upper Electronic Module (UEM)
- Checking wiring and terminals Checking Wiring And Terminals

Was a fault detected?

Yes - Checking the function of the upper electronic module (UEM)

No - Checking communication with the upper electronic module (UEM)

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Checking communication with the upper electronic module (UEM)

Hint: The CAN communication with the control module is probably OK if the control module ID can be read off. In that case the fault is probably intermittent and will then be more difficult to trace.




- Try to communicate with the upper electronic module (UEM) by reading off the control module ID
- Click on the symbol for VCT2000 to begin reading off

Continue - Fault Found

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No Fault Found - No Fault Found

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Checking the function of the upper electronic module (UEM)

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








- Ignition off
- Reconnect the connectors. Reinstall the components
- Ignition on.
Check that the upper electronic module (UEM) is powered by switching on one of the rear reading lamps.

Does one of the rear reading lamps light?

Yes - FAULT FOUND

No - Fault-tracing information

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Fault-tracing information

- Checking the power supply and ground for the upper electronic module (UEM)

Attempt New Test - Checking the function of the upper electronic module (UEM)

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