Signal Too High
Signal too high
Checking components and wiring
Check the power unit connector and climate control module connector A (30-pin). Check for contact resistance and oxidation.
Check the cable between climate control module #A27 and power unit terminal #4. Check for an open-circuit.
Check the cable between climate control module #A27 and power unit terminal #2 and blower fan relay terminal #4. Check for a short-circuit to supply voltage.
Check the ground lead between power unit terminal #2 and its ground terminal. Check for an open-circuit.
Try a new power unit if the wiring is OK.
Remedy as necessary.
Other information
- To access or replace the power unit, see Power unit blower fan Power Unit Blower Fan
- To access or replace the blower fan motor, see Fan motor Fan Motor
- To access and replace the blower fan relay, see Replacing the blower fan relay Service and Repair
- To connect the breakout box to the climate control module, 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
Was a fault detected?
Yes - Verification
No - Intermittent fault
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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
- Start the blower fan
- Slowly turn the blower fan selector to each position.
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 components and wiring
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Intermittent fault
Check the power unit connector and climate control module connector A (30-pin). Check for contact resistance and oxidation.
Check the cable between climate control module #A27 and power unit terminal #4. Check for an open-circuit and an intermittent short-circuit to supply voltage.
Check the ground lead between power unit terminal #2 and its ground terminal. Check for an open-circuit.
Remedy as necessary.
Other information
- To remove the control module, see Comfort module Removal and Replacement
- To access or replace the power unit, see Power unit blower fan Power Unit Blower Fan
- To connect the breakout box to the climate control module, 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 the resistance values, 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 components and wiring
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