Signal Too Low
Signal too low
Checking function of power unit
- Ignition on
- Slowly turn the blower fan selector between minimum and maximum.
Check that the function is OK
- The fault is intermittent if the function is OK.
Is the function OK?
Yes - Intermittent fault
No - Checking cables
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Checking cables
Check the cable between climate control module #A26 and power unit terminal #3. Check for a short-circuit to ground.
Try a new power unit if the wiring is OK.
Remedy as necessary.
Other information
- To access and replace the power unit, see Power unit blower fan Power Unit Blower Fan
- 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
- For other information, see Electrical / electronic system specifications [1][2]Specifications
- 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
- Wait at least 10 seconds for the control module to carry out its diagnostics
- Slowly turn the blower fan selector between minimum and maximum.
Check that the function is OK.
The fault has been remedied if the function is OK.
Is the function 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 function of power unit
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Intermittent fault
Check the cable between climate control module #A26 and power unit terminal #3. Check for an intermittent short-circuit to ground.
Remedy as necessary.
Other information
- To remove the control module, see Comfort module Removal and Replacement
- To access and replace the power unit, see Power unit blower fan Power Unit Blower Fan
- 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
- For other information, see Electrical / electronic system specifications [1][2]Specifications
- Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults
Continue - Fault-tracing information
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Fault-tracing information
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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Attempt New Test - Checking function of power unit
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