Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking components and wiring
Check the resistance of the evaporator temperature sensor. Take the readings between evaporator temperature sensor terminals #3 and #4.
Check the cable between climate control module terminal #B3 and evaporator temperature sensor terminal #4. Check for a short-circuit to ground.
Remedy as necessary.

Other information:
- For the resistance values, see Electrical / electronic system specifications [1][2]Specifications
- To replace the control module, see Comfort module Removal and Replacement
- To replace the evaporator temperature sensor, see Temperature sensor evaporator Removal and Replacement
- To connect the breakout box, see Connecting the breakout box, climate control module Connecting The Breakout Box
- For the voltage of the signal cable, see Climate control signal specifications Signal Specification
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault














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
- Read off the evaporator temperature.
Check that the evaporator temperature is correct. The fault has been remedied if the evaporator temperature is correct.





Is the temperature reading OK?

Yes - FAULT FOUND

No - 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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking components and wiring

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