No Communication
No communication
Checking the diagnostic trouble codes (DTCs)
- Ignition on.
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-DD12-CCM-DD18)
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 #3
- The connector for climate control module (CCM) terminal #12 (#36) and connector A for seat heating module (SHM) left terminal #4.
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 Wiring Diagram
- Connecting the breakout box Connecting the Breakout Box, Climate Control Module (CCM)
- Signal description Signal Description, Climate Control Module (CCM)
- Component location Component Location, Climate Control Module (CCM)
- Climate control module (CCM) Service and Repair
- Seat Heating Module (SHM) 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 Wiring Diagram
- Connecting the breakout box Connecting the Breakout Box, Climate Control Module (CCM)
- Signal description Signal Description, Climate Control Module (CCM)
- Component location Component Location, Climate Control Module (CCM)
- Climate control module (CCM) Service and Repair
- Seat Heating Module (SHM) 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.
Check that the relevant diagnostic trouble code (DTC) has switched status from permanent to intermittent fault.
Check also that diagnostic trouble code CCM-0070, CCM-0071 or CCM-0072 have not been generated in connection with an identification of damper motors.
These diagnostic trouble codes can only be generated in connection with an identification of damper motors and means that identification has failed for some reason.
Remedy by attempting to identify the damper motors again. Alternatively fault-trace the relevant diagnostic trouble codes (DTCs).
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
Attempt New Test - Checking the diagnostic trouble codes (DTCs)
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