125000567 - J33 AUTOMATIC DEMISTING NOT WORKING
The automatic demisting function does not work with the climate control system switched on | In systems where there is the ''automatic demister'' function with the windscreen misted up and the climate control system on automatic operation, the control unit acts by increasing the fan speed - orientating the air distribution to the windscreen and sides |
| Results of the tests | ||||
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
|---|---|---|---|---|
| Connect the (Examiner Plus or Smart) diagnostic equipment to the diagnostic socket and check that there are no errors in the climate control system control unit | Continue to Step 2 | Faults in control unit | Continue according to the instructions for the diagnostic equipment | |
| 2 | CHECK ON SENSOR SUPPLY | All OK | Problems met | Operation |
Check the following, in order:
| Continue to Step 3 | Fuse blown | Replace the fuse and search for the cause of the short circuit | |
| No sensor earth/supply | Restore the correct connections See See E6020 AIR CONDITIONING | |||
| Connection broken | Restore the correct connection See See E6020 AIR CONDITIONING | |||
| 3 | CORRECT OPERATION CHECK | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Replace the climate control system control unit Op. Op. 5040D15 CONTROL UNIT WITH AUTOMATIC DUEL ZONE AIR CONDITIONER KNOBS AND BUTTONS R R | |