Power Mirror Control Module: Service and Repair

Rear View Mirror, Replacing

NOTE: A rear view mirror with manual function cannot be replaced with automatic anti-dazzle or vice versa. The car will store diagnostic trouble codes (DTCs).

The upper electronic module (UEM) is integrated in the rear view mirror.

Replacing The Upper Electronic Module (UEM), or Rear View Mirror

Preparations

NOTE: Read off data from the control module before replacing the control module. Program this data back into the new control module. Programmed data is read off via VADIS vehicle communication.

CAUTION: New software can only be ordered after the control module has been installed in the car. VADIS reads off the new control module identity which is required to order the correct software.

Always check that the control module and control module box connectors do not have bent or damaged terminals or socket/sleeves. This may have been the cause of a fault.

Removing the control module







- Remove the lens
- Remove the 2 screws at the front edge
- Press the 2 rear catches forward
- Press two of the catches on one side inwards. Remove the bulb holder
- Disconnect the 2 connectors
- Disconnect the ground lead.

HINT: Only certain versions of the upper electronic module (UEM) have a ground lead.







- Remove the control module connector cover.







- Flip the anti-dazzle button toward the lens. Disconnect the connector in the control module by pressing the catch through the opening. Use a screwdriver
- Remove the screw from the control module
- Remove the control module.

Check
Check that the control module connectors are intact.

Installing the control module
- Screw the control module screw into place
- Connect the connector for the control module
- Reinstall the cover for the control module connector
- Connect the 2 connectors
- Press the bulb holder into place
- Install the ground lead
- Install the 2 screws at the front edge
- Install the lens.

Ordering software
Order software.

Programming the control module
Program the new control module.

Finishing
Program in the data read off from the old control module.