CEM-8F21

Condition
If windscreen wiper is in its rest position (home position) but wiper switch is in an activated position (that is, one of the positions for full/half-speed, intermittent or single sweep wipe), diagnostic trouble code CEM 8F21 is displayed.

Condition
Only low wiper speed works.

Possible source
- Short circuit to voltage supply or open circuit on switch which indicates operation/ rest position
- Defective windscreen wiper lever
- Defective fuse 11C/22.

Condition
- Wiper only works on lowest speed.