Signal Too Low

Signal too low

Checking the passenger compartment temperature




- Ignition on.
Check that the value from the passenger compartment temperature sensor is within the permitted range. The temperature must correspond to the ambient temperature.
The fault is intermittent if the outside temperature is now correct.
Read off the passenger compartment temperature by clicking on the VCT2000 symbol.





Are the temperatures correct?

Yes - Checking the connectors and wiring

No - Checking the component and wiring

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Checking the connectors and wiring




- Ignition off
- Disconnect the connector on the climate control module (CCM).
Check the signal cable between the climate control module (CCM) and the passenger compartment temperature sensor. Check for an intermittent short-circuit to ground.
Take a reading between terminals #6 (#30) and #16 (#40) on the connector for the climate control module (CCM).
The resistance must be infinite.
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 Description, Climate Control Module (CCM)
- Location of components Component Location, Climate Control Module (CCM)
- Climate control module (CCM) Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals





Continue - Information

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Checking the component and wiring




- Ignition off
- Disconnect the connector on the climate control module (CCM).
Check the signal cable between the climate control module (CCM) and the passenger compartment temperature sensor. Check for a short-circuit to ground.
Take a reading between terminals #6 (#30) and #16 (#40) on the connector for the climate control module (CCM).
The resistance must be infinite.
Check that the climate control module (CCM) is receiving a correct value from the passenger compartment temperature sensor by measuring its resistance and comparing with the values in the table.
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 Description, Climate Control Module (CCM)
- Location of components Component Location, Climate Control Module (CCM)
- Climate control module (CCM) Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
- Component resistance values [1][2]Electrical Specifications





Continue - Verification

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Verification




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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Check the passenger compartment temperature sensor by clicking the VCT2000 symbol.
Check that the value from the passenger compartment temperature sensor corresponds to the ambient temperature.





Are the temperatures correct?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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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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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 - Exit Fault-Tracing

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