Faulty Signal

Faulty signal

Checking components and wiring
The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that the signal on the cable to the driver's seat position sensor is faulty.
If the fault is intermittent, it has been registered previously but is no longer present. Intermittent faults can be caused by interference at start up or can be a different type of fault which occurs on different occasions. The fault is evaluated depending on how it occurs.
Check the connectors on the central electronic module (CEM) and seat position sensor. Check for contact resistance and oxidation. Check for damaged or loose connections.
Check the connectors between the central electronic module (CEM) and the seat position sensor. Check for an open-circuit. Check for a short-circuit to another signal cable.
Take readings between:
- Central electronic module (CEM) terminal D25 (#25) and seat position sensor terminal #1
- Central electronic module (CEM) terminal D10 (#10) and seat position sensor terminal #2.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Specification
- Power seat module (PSM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals

Continue - Verification

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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 position of the seat.
Move the seat forwards and backwards. Check that the value changes.
Measurement range 0-5 V.





Is the function OK?

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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