Faulty Signal

Faulty signal

Checking heater elements




- Ignition on.

Checking components and connectors
Check the connectors. Check for contact resistance. Check for oxidation. Check for loose connections.
Check the heating loop in the seat. Take readings between:
- terminals #1 and #4 on connector B for the seat heating module (SHM). Check for an open-circuit
- terminal #1 on connector B and chassis ground. Check for a short-circuit to ground
- terminal #1 on connector B and terminal #4 on connector A. Check for a short-circuit to supply voltage.
Check the heating loop in the backrest. Take readings between:
- terminals #1 and #2 on connector C for the seat heating module (SHM). Check for an open-circuit
- terminal #1 on connector C and chassis ground. Check for a short-circuit to ground
- terminal #1 on connector C and terminal #4 on connector A. Check for a short-circuit to supply voltage.
Remedy as necessary.

Other information:
- For further information about the connectors, fuses and relays, see the relevant section in the Wiring Diagram
- Connecting the breakout box Connecting the Breakout Box, Climate Control Module (CCM)
- Signal specification Signal Specification, Climate Control Module (CCM)
- Climate control, location of components Climate Control, Location of Components
- Seat heating module (SHM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals


Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Engine running.
Activate the seat heating. Check that the seat heats up.

Is the seat heater functioning?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking heater elements

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Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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FAULT FOUND - Fault Found

Attempt New Test - Checking heater elements

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