Signal Too High / Signal Too Low
Signal too high / Signal too low
Checking the cable
- Ignition off
- Disconnect the connector for the climate control module (CCM)
- Ignition on.
Check LIN bus 1. Check for a short-circuit to supply voltage.
Take a reading on the connector for the climate control module (CCM) between terminals #12 (#36) and #1 (#25).
If there is a short-circuit to supply voltage in LIN bus 1, continue fault-tracing by locating where the short-circuit has occurred as follows:
- Disconnect the connector on the climate control unit that connects LIN bus 1 from the climate control module (CCM) to other components on the climate control unit
- Check the section of LIN bus 1 that connects the climate control module (CCM) to the left-hand seat heating module (SHM) and the connector on the climate control unit. Take a reading on the connector for the climate control module (CCM) between terminals #12 (#36) and #1 (#25).
If the fault persists, fault-trace LIN bus 1 between the climate control module (CCM), the left-hand seat heating module (SHM) and the connector for the climate control unit. Check for a short-circuit to supply voltage.
If the fault is no longer present, fault-trace LIN bus 1 between the connector and the components of the climate control unit. 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)
- 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
Was a fault detected?
Yes - Verification
No - Checking the cable
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Checking the cable
- Ignition off
- Disconnect the connector for the climate control module (CCM).
Check LIN bus 1. Check for a short-circuit to ground.
Take a reading on the connector for the climate control module (CCM) between terminals #12 (#36) and #16 (#40).
If there is a short-circuit to ground in LIN bus 1, continue fault-tracing by locating where the short-circuit has occurred as follows:
- Disconnect the connector for the climate control unit that connects LIN bus 1 from the climate control module (CCM) to the other components on the climate control unit
- Check the section of LIN bus 1 that connects the climate control module (CCM) to the left-hand seat heating module (SHM) and the connector on the climate control unit. Take a reading on the connector for the climate control module (CCM) between terminals #12 (#36) and #16 (#40).
If the fault persists, fault-trace LIN bus 1 between the climate control module (CCM), the left-hand seat heating module (SHM) and the connector for the climate control unit. Check for a short-circuit to ground.
If the fault is no longer present, fault-trace LIN bus 1 between the connector and the components of the climate control unit. Check for a short-circuit to ground.
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)
- 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
------------------------
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 cable
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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 cable
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