2013 Mercedes Benz C 63 AMG Coupe Technical Service Bulletin # LI91-10_P-054143 Date: 120913

Interior - Power Seat Fore/Aft Adjustment Inoperative
Electric seat fore/aft adjustment nonfunctional
Topic number LI91.10-P-054143
Version 1
Design group 91.10 Front seats
Date 09-13-2012
Validity Model series 204.3, 207, 212 and 218 with fully electric seat adjustment
Reason for change
Complaint:

1. Noises when operating electric seat fore/aft adjustment


2. Electric fore/aft adjustment nonfunctional

Cause:

1. Frictional vibrations along fore/aft adjustment shaft


2. Motor detached owing to mechanical damage to electric motor retaining plate caused by the customer

2013 Mercedes Benz C 63 AMG Coupe (204.377) V8-6.3L (156.985) Page 17
Remedy:
Replacement of adjustment motor, shafts and electric motor retaining plate of relevant seat.
Contents of parts kit, see Pic above.
Instructions for replacement of electric motor with electric motor retaining plate:
1. Move seat to forwardmost position
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2. Remove seat cushion as per work instructions (Note: you do not have to cut the pneumatic lines as indicated in work instructions (see Pic 10) -
take care not to pinch or kink the lines!)

1. Detach plastic rails used to mount control unit (Pic 1)


2. Disconnect electric motor plug contact

2013 Mercedes Benz C 63 AMG Coupe (204.377) V8-6.3L (156.985) Page 19

1. Remove bolts T40 securing electric motor retaining plate (Pic 2)


2. Push out electric motor upward (Pic 3)


3. Remove electric motor


4. Pull shafts out of rails using pliers

Important:
To ensure the parallelism of the two rails, do not twist the shafts and do not push against the rails mechanically.
9. Remove electric motor retaining plate
10. Position new electric motor retaining plate and screw in new bolts by a few threads
11. Insert shafts all the way into rails
Important:
Do not turn the shafts by hand.
If the electric motor or one of the shafts has become detached as a result of the damage, it is essential to check and, if necessary, to restore the
parallelism.
2013 Mercedes Benz C 63 AMG Coupe (204.377) V8-6.3L (156.985) Page 20
To do so, compare the longitudinal position of the rear edge of the respective rail using a measuring tape (Pic 11) and adjust by turning the
inserted shaft

1. Attach rubber mounts to new electric motor


2. . Attach electric motor to short shaft first (Pic 4)

Note:
The electrical connection must always point upward.
14. Attach rubber cap to long shaft and insert long shaft at electric motor
2013 Mercedes Benz C 63 AMG Coupe (204.377) V8-6.3L (156.985) Page 21

1. Secure shaft and electric motor on retaining plate (Pic 5-7)


2. . Tighten bolts securing electric motor retaining plate to 25Nm

2013 Mercedes Benz C 63 AMG Coupe (204.377) V8-6.3L (156.985) Page 22
17. Assemble remaining components in reverse order
Attachments
Symptoms
Parts
Attachments
Work units
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WIS-References