Troubleshooting the Air Blower (Focus Turnier 1)

If the supercharger does not operate in any of the switch positions, first check fuse 64 (auxiliary fuse box in the engine compartment).

If the fuse is OK, check the blower switch by removing the control module as described above.

Check if there is voltage at the contacts of the multi-pin connector. If not, also check the supply wire starting from the fuse box.

The next step is to check the switch for conductivity in all positions. To do this, connect a multimeter.

It is better to replace a faulty switch; from experience, repair makes no sense.

But if the switch is OK, then the next step is to check the ground connection of the supercharger motor.

If there is no defect there, then the supercharger motor itself is faulty (the graphite contacts are burnt, the armature windings are baked).