Disconnect the electric fan electronics connector.
Turn the ignition key to position «ON» (IGNITION).
Measure voltage between terminals «1» And «3» disconnected connector.
Rated value: on-board network voltage
Connect the connector of the electronic unit of the electric fan and disconnect the connector of the electric fan (left).
Turn off the air conditioner and start the engine.
Measure voltage between terminals «1» And «2» disconnected connector (on the electronic unit of the electric fan).
Rated value: 1 V or less.
Note. Do not touch the electric fan which may start to work.
Turn on the air conditioner.
Measure voltage between terminals «1» And «2» disconnected connector (on the electronic unit of the electric fan) during operation of the electric fan (right). The voltage should change according to the values below.
- Rated value: 1.1V or less; 8.2±0.7 V.
- On-board network voltage±2.6 V.
If the voltage at the connector does not change according to these values, the electric fan electronics must be replaced.