S 55 AMG (220.174) V8-5.5L SC (113.991) (2004)
Power Seat Motor: Service and Repair
AR91.29-P-1430M Remove/Install Front Seat (Backrest) Adjusting Motors
AR91.29-P-1430M Remove/Install Front Seat (Backrest) Adjusting Motors
- Backrest adjustment and head restraint adjustment
1
Remove front seat
2
Remove seat-back lining from seat backrest
3
Remove head restraint up/down motor (M27m4/M28m4)
NOTE: Only when replacing. First press head restraint up/down motor (M27m4/M28m4) to right side and then remove downward.
4
Expose upholstery (1) around backrest forward/back motor (M27m5, M28m5) (see arrow)
5
Remove side paneling (9) from seat belt buckle (7)
NOTE: Screws (8, arrow) and retaining clip (see detail).
6
Disconnect head restraint wiring harness (2) from head restraint up/down motor (M27m4, M28m4)
NOTE: Head restraint wiring harness (2) and wiring harness (10) are connected together with the backrest forward/back motor (M27m5,
M28m5).
7
Expose head restraint wiring harness (2) at right side of backrest frame
8
Expose wiring harness (1) of left (N32/1), right (N32/2) front seat adjustment control module with memory as far as backrest forward/back motor
(M27m5, M28m5)
NOTE: Installation: Fix wiring harness (10) to existing cables using tie straps.
9
Unscrew screw (3) from right backrest frame and pull backrest forward/back motor (M27m5, M28m5) out towards rear
-
Internal torx set: See "Special Tools" below.
-
Bolt, backrest adjustment motor: 5 Nm
10
Install in the reverse order