Removing and Installing Control Unit For Rear Differential Lock

WM 397519 Removing and installing control unit for rear differential lock








Preliminary work

1. Remove side trim panel for rear luggage compartment.

Information:
Only for vehicles with additional air conditioning.

2. Loosen additional air conditioning unit and swivel it to one side with the lines connected.

Removing control unit for rear-differential lock





Installation position of control unit for rear-differential lock

Caution:
Risk of short circuit!

- Before removing the control unit, switch off the ignition.

Information:
- Only for vehicles without auxiliary air conditioner.

Unscrew fastening screws -1- and remove package box -2- ().





Removing package box

1. Unscrew fastening screws -1- and remove control unit for rear-differential lock -2- from the body .





Removing control unit for rear differential lock

2. Release lock -1- on the connector -2- (-arrow A-) and pull off connector -2- (-arrow B-).





Pulling off connector

3. Release holder -1- at the two clips -arrows A-, lift up control unit for rear-differential lock -2- and slide it out -arrow B-.





Removing control unit for rear differential lock

Installing control unit for rear-differential lock

1. Slide control unit for rear-differential lock -2- fully into the holder -1- and press it in -arrow A- until the two clips -arrows B- engage securely.





Installing control unit for rear differential lock

2. Plug in connector -2- (-arrow A-) and close the lock -1- (-arrow B-).





Plugging in connector

3. Fit control unit for rear-differential lock -2- into the body and secure with the fastening screws -1-. - Tightening torque: 4.5 Nm (3.0 ftlb.) ±1 Nm (±0.5 ftlb.)





Securing control unit for rear-differential lock

Information:
- Only for vehicles without auxiliary air conditioner.

Position package box -2- on the body and secure with the fastening screws -1-.





Installing package box

4. A charger with a current rating of at least 40 A must be connected to the vehicle battery.
5. PIWIS Tester 9718 must be connected to the vehicle. Start the PIWIS Tester. Switch on ignition using original key and press - to continue.
6. Select vehicle type and press -.
7. Select the rear-differential lock control unit and press -.
8. Read out fault memory. Erase the fault memory if necessary.
9. Carry out a test drive and read out the fault memory. If faults are present, proceed in accordance with the Guided Fault Finding instructions.

Subsequent work

Information:
Only for vehicles with additional air conditioning.

1. Secure additional air conditioning unit.
2. Install side trim panel for rear luggage compartment.