Central Electronics Box: Service and Repair

12 90 ... - Removing and installing/replacing electronics box





Important!
Read and comply with notes on protection against electrostatic damage (ESD protection) 61 35 ... Notes on ESD Protection (Electro Static Discharge).

Note:
Follow instructions for removing and installing electronic control units Service and Repair





Necessary preliminary tasks:
- Read fault memory.
- Disconnect negative battery cable 61 20 900 Disconnecting and Connecting Battery Negative Lead
- Remove microfilter housing 64 31 092 Removing and Installing/Replacing Microfilter Housing (Lower Section)
- Remove tension strut on spring strut dome Service and Repair on right





Release screws (1).
Slacken nut (2).
Lift out right heater end plate (3).

Installation Note:
Ensure gasket (4) is correctly seated.





Unlock fasteners (1) from below and slide upwards approx. 10 mm.
Unlock locks (2) in direction of arrow.
Remove cover (3).





Disconnect plug connection (1).
Unlock plug connection (2) in direction of arrow and disconnect.
Pull wiring harness grommet (5) out of electronics box and remove wiring harness (4).
Pull wiring harness grommet (3) out of electronics box and remove wiring harness with equipment carrier (6).

Installation Note:
Make sure wiring harness grommets (3, 5) are correctly seated in electronics box.





If necessary, press locking tabs (1) in direction of arrow and pull contact carrier (2) out of housing.





If necessary, press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.





Release screws (1).
Replacement:
Modify water drain valve (2) and bump stop (3).






Installation Note:
Make sure gasket (1) is correctly seated on electronics box.