Checking the technical condition
1. Turn on the ignition.
2. By manually changing the position of the control switch, measure the voltage between terminals 1 and 2 of the fan motor.
3. Move the control switch to the position where the voltage rises to the level corresponding to the maximum rotational speed.
4. If the measured voltage is not within specifications, substitute a known-good power transistor and test for proper operation.
5. If the problem is corrected, replace the power transistor.
Replacement
1. Disconnect the negative battery terminal.
2. Disconnect the connector (A) power transistor, unscrew the fastening screws and remove the power transistor (IN).
3. Installation is made in the reverse order of removal.