Mercedes-Benz A220 2020 Technical Service Bulletin # LI72-40_P-0550452 Date: 130107

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

Mercedes-Benz A220 2020 Page 429

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)

Mercedes-Benz A220 2020 Page 430

Symptoms

Mercedes-Benz A220 2020 Page 431

Control unit/fault code