Signal Too Low

Signal too low

Checking cables
Check the cable between climate control unit terminal #A27 and power unit terminal #4. Check blower fan motor terminal #2 and the maximum relay for blower fan terminal #4. Check for a short-circuit to ground.

Note! When the ignition is on and the blower fan is not activated, the voltage on the diagnostic cable is approximately the same as battery voltage (Ubat). The signal voltage falls with increased fan speed when the blower fan is activated.

Try a new power unit or a new blower fan relay if the cables are OK.
Remedy as necessary.

Other information
- To access and replace the power unit, see Power unit blower fan Power Unit Blower Fan
- 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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Intermittent fault
Check the cable between climate control unit terminal #A27 and power unit terminal #4. Check blower fan motor terminal #2 and the blower fan relay for blower fan terminal #4. Check for a short-circuit to ground.

Note! When the ignition is on and the blower fan is not activated, the voltage on the diagnostic cable is approximately the same as battery voltage (Ubat). The signal voltage falls with increased fan speed when the blower fan is activated.

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 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. Intermittent faults Checking Wiring and Terminals. Intermittent Faults














Continue - Fault-tracing information

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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
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 cables

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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 cables

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