Diagnostic Trouble Code Information

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.

Substitute Value 

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.

Fault symptom[s] 

• Wiper only works on lowest speed