Checking Blower Fan Control (ECC)

Checking blower fan control (ECC)

Checking blower fan function (ECC)




- Ignition on.
- Activate the blower fan by turning blower fan control switch to the different manual speed settings.
Check if the blower fan starts or not.









Does the fan start?

Yes - Checking cables, blower fan starts

No - Checking cables, blower fan does not start

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Checking cables, blower fan does not start
Check the ECC control module, blower fan power unit connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check that connectors are connected correctly.
Check signal cable between ECC control module #A15 and power unit #A1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check signal cable between ECC control module #A5 and power unit #A3 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check power supply to blower fan for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check ground lead between blower fan and power unit for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If cables are OK, try a new power unit.
Remedy as necessary.

Other information:
- To access/replace the control module, refer to Replacing ECC control module Removal and Replacement.
- To access/replace the power unit, refer to Replacing the power unit (Electronic climate control) Replacing the Power Unit (Electronic Climate Control).
- To access/replace the blower fan, refer to Replacing blower fan motor Replacing Blower Fan Motor.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- For information on signals, refer to Signal specification ECC Signal Specification ECC.














Continue - Verification

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Checking cables, blower fan starts
Check signal cable between ECC control module #A15 and power unit #A1 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check ground lead between blower fan and power unit for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If cables are OK, try a new power unit.
Remedy as necessary.

Other information:
- To access/replace the control module, refer to Replacing ECC control module Removal and Replacement.
- To access/replace the power unit, refer to Replacing the power unit (Electronic climate control) Replacing the Power Unit (Electronic Climate Control).
- To access/replace the blower fan, refer to Replacing blower fan motor Replacing Blower Fan Motor.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.
- For information on signals, refer to Signal specification ECC Signal Specification ECC.














Continue - Verification


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Verification

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












- Ignition off.
- Reconnect connectors, reinstall components.
- Ignition on.
- Activate the blower fan by turning blower fan control switch to the different manual speed settings.
Check the blower fan is operating correctly.

Is the fan working?

Yes - Fault has been remedied

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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