Body/Electrical - Various Door Control Function Failures

Various function failures in the door control

Topic number LI72.40-P-055045

Version 2

Design group 72.40 Door control

Date 01-07-2013

Validity MODEL 166 with code 803 up to VIN end number A168336
MODEL 172 with code 803 up to VIN end number F062354
MODEL 176 with code 803 up to VIN end number J038712
MODEL 204 with code 803 up to VIN end number A824928
MODEL 204 with code 803 up to VIN end number G062313
MODEL 204 with code 803 up to VIN end number L218393
MODEL 204 with code 803 up to VIN end number R273380
MODEL 207 with code 803 up to VIN end number F209913
MODEL 212 with code 803 up to VIN end number A731976
MODEL 212 with code 803 up to VIN end number L093279
MODEL 218 with code 803 up to VIN end number A081880
MODEL 231 with code 803 up to VIN end number F014916
MODEL 246 with code 803 up to VIN end number J132310
MODEL 246 with code 803 up to VIN end number N037020

Reason for change Validity, complaint and symptom supplemented

Complaint:
Various function failures in the door control (only front doors affected):

^ Automatic window raising not possible

^ Power window cannot be normalized

^ Automatic fold in/out function of outside mirror faulty

^ Malfunction of central locking

^ Actuation of illumination in doors faulty

^ Malfunction of seat adjustment

Notes:
^ The fault memory of the door control unit (DCU-xF) may contain stored fault codes that are listed under "Control unit/fault code" (see below).

^ In the event of a complaint, the fault is continuously present.

Cause:
Waking of the door control units with a simultaneous voltage dip in the power supply (< 5 V) can cause the above function failures under certain circumstances.

Remedy:

1. Perform reset of affected door control unit (unplug connector 3 at DCU-xF for approx. 20 seconds)

2. Perform normalization of power window system.

3. Erase fault memory.

4. Check whether the fault was rectified by the reset.

=> Fault not rectified: Continue with step 5.

=> Fault rectified: Continue with step 6.

5. Replace door control unit (DCU-xF).

6. Perform initial startup of door control unit: (Xentry Diagnostics => Control unit view => DCU-xF => Adaptations => Initial startup)





Symptoms








Control unit/fault code