Checking Electrically Operated Lumbar Support

Checking electrically operated lumbar support

Fault-tracing information

Note! This symptom fault tracing only applies to vehicles with electrically operated lumbar support.

Disconnect and then reset all contacts on the lumbar support control module and on the lumbar support motor.

Does the control module work after reconnection?

Yes - FAULT FOUND

No - Fault-tracing

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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 - Fault-tracing information

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Fault-tracing

Caution!

Perform the following checks to ensure that there are no electrical faults in the lumbar support control module.
- Check that the separate cable that is connected from ground (31/6) in the passenger compartment fusebox (CJB) to the PSM does not have a short-circuit.
- Check the cable between the lumbar support control module and the lumbar support switch for a short circuit and open circuit.
- Check that the lumbar support switch is not defective.
- Check the pin as follows, using the inset circuit diagram, to ensure that the lumbar support control module works.
- Check whether the lumbar support control module is powered by measuring the voltage on pins 3 and 10 (ground) on the connector. Approved range is 9 - 16 V.
- Check whether the lumbar support motor is powered by measuring the voltage on pins 11 and 12 on the connector or by measuring pins 1 and 2 on the lumbar support motor.
- Check whether the lumbar support switch is powered by first measuring the voltage on pins 6 and 21 (ground) and then on pins 7 and 21 (ground) on the connector. The highest, approved value is 1 V.
Remedy as necessary.









Does the problem persist?

Yes - Replacing the control module

No - FAULT FOUND

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Replacing the control module
Replace the lumbar support control module and test whether the lumbar support works correctly after replacement.

Does the lumbar support work correctly after replacement?

Yes - FAULT FOUND

No - Information

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