No Communication
No communication
Checking the diagnostic trouble codes (DTCs)
- Ignition on.
Check that the fuse for the Seat heating module (SHM) is intact.
The diagnostic trouble code (DTC) may occur together with diagnostic trouble codes (DTCs) for other components that communicate with the climate control module (CCM) via LIN bus 1.
Check whether the diagnostic trouble code (DTC) has been stored together with other diagnostic trouble codes (DTCs) for other components on the climate control unit.
Select one of the following options:
1. The diagnostic trouble code (DTC) is stored together with diagnostic trouble codes (DTCs) for components on LIN bus 1 (CCM-DD10 - CCM-DD16)
2. The diagnostic trouble code (DTC) is not stored together with diagnostic trouble codes (DTCs) for other components on LIN bus 1.
Select an alternative.
1 - Checking LIN bus 1 and connector
2 - Checking the wiring and component
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Checking LIN bus 1 and connector
- Ignition off
- Disconnect the connector for the climate control module (CCM).
Check the climate control module (CCM) connector. Check for contact resistance. Check for oxidation. Check for loose connections.
Check LIN bus 1 between the climate control module (CCM), the connector for the climate control unit and the left-hand seat heating module (SHM). Check for an open-circuit.
Take readings between:
- The connector for climate control module (CCM) terminal #12 (#36) and the connector for climate control unit terminal #2
- The connector for climate control module (CCM) terminal #12 (#36) and connector A for seat heating module (SHM) left terminal #2.
Check LIN bus 1 between the components (the damper motors and the air quality sensor (AQS)) and the connector for the climate control unit. Check for an open-circuit.
Check the connector for the climate control unit. Check for contact resistance. Check for oxidation. Check for loose connections.
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
- Climate control module (CCM), replacing Service and Repair
- Seat heating module (SHM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Verification
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Checking the wiring and component
- Ignition off
- Disconnect connector A for the seat heating module (SHM) left.
Check connector A for the seat heating module (SHM). Check for contact resistance. Check for oxidation. Check for loose connections.
Check that the seat heating module (SHM) is connected to power supply and ground.
Measure the voltage at connector A between terminals #1 and #4.
Check LIN bus 1 by taking a reading between connector A for seat heating module (SHM) terminal #2 and the connector for the climate control module (CCM) terminal #12 (#35). Check for an open-circuit.
Try replacing the seat heating module (SHM) if no fault is found.
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
- Climate control module (CCM), replacing Service and Repair
- 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.
- Ignition on.
Check that the relevant diagnostic trouble code (DTC) has switched status from permanent to intermittent fault.
Check also that diagnostic trouble code (DTC) CCM-0070, CCM-0071 CCM-0072 or CCM-0073 has not been stored during identification of the damper motors.
These diagnostic trouble codes (DTCs) can only be stored when identifying damper motors. They mean that the identification has failed for some reason.
Remedy by correctly identifying the damper motor. Fault-trace according to the relevant information.
Has the status of the diagnostic trouble code (DTC) changed?
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 the diagnostic trouble codes (DTCs)
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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 the diagnostic trouble codes (DTCs)
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