Originally Posted by TerminatorX5
the WDS differentiates between comfort seats and other seats.. the comfort ones have the moving headrests, so, couple extra wires...
i would start from simple to more complex... the last resort is to replace the module but before that, i would check the wiring, to see if there are any broken, chaffed, or otherwise compromised wires... the seat is a moving object, with wires under the seat that can be pinched, cut off and what not...
the WDS shows 4 plugs under the seat, 3-, 4-, 12-, and 15-pin connectors... check them out, see what is up with them... if the need be, don't be afraid to remove the seat and flip it upside down, there are only 2 nuts and 2 bolts holding the seat, the front bolts have plastic covers...
Oh, there will be a plug under the seat that has YELLOW cover, and some other YELLOW markings - that is airbag related plug, when the plug is disconnected do NOT turn the ignition on, otherwise you will get the airbag light on the cluster...
so, check for wiring damage first...
A21 Seat/steering column memory (SM/LSM) control unit
Plug connector overview
Number X-pin, colour Description
X650 12-pin, black Plug connector Seat/steering column memory (SM/LSM) control unit
X653 4-pin, natural Plug connector Seat/steering column memory (SM/LSM) control unit
X1465 15-pin, black Plug connector Seat/steering column memory (SM/LSM) control unit
X18840 3-pin, black Plug connector Seat/steering column memory (SM/LSM) control unit
Pin assignments at plug connector X650
Pin Type Description / Signal type Connection / Measuring notes
1 E Switch signal Steering column adjustment motor Steering column adjustment motor
2 A Positive activation Driver's backrest recliner motor Driver's backrest recliner motor
3 A Positive activation Driver's seat height adjustment motor Driver's seat height adjustment motor
4 A Positive activation Driver's seat cushion tilt motor Driver's seat cushion tilt motor
5 A Positive activation Driver's seat movement motor Driver's seat movement motor
6 Not used
7 A Switch signal Steering column inclination motor Steering column inclination motor
8 E Negative activation Driver's backrest recliner motor Driver's backrest recliner motor
9 E Negative activation Driver's seat height adjustment motor Driver's seat height adjustment motor
10 E Negative activation Driver's seat cushion tilt motor Driver's seat cushion tilt motor
11 E Negative activation Driver's seat movement motor Driver's seat movement motor
12 Not used
Pin assignments at plug connector X653
Pin Type Description / Signal type Connection / Measuring notes
1 E Switch signal Steering column adjustment motor Steering column adjustment switch
2 E Switch signal Steering column adjustment motor Steering column adjustment switch
3 E Switch signal Steering column adjustment motor Steering column adjustment switch
4 E Switch signal Steering column adjustment motor Steering column adjustment switch
Pin assignments at plug connector X1465
Pin Type Description / Signal type Connection / Measuring notes
1 A Upward inclination signal Driver's seat Driver's seat cushion tilt motor
2 A Downward inclination signal Driver's seat Driver's seat cushion tilt motor
3 A Slide back signal Driver's seat Driver's seat movement motor
4 A Slide forward signal Driver's seat Driver's seat movement motor
5 A Signal, raise seat height Driver's seat Driver's seat height adjustment motor
6 A Ground Ground point
7 A Signal, seat backrest forward Driver's seat Driver's backrest recliner motor
8 E Pin assignments at plug connector 3 Fuse F26
9 E/A I-bus connector General module
10 A Signal, lower seat height Driver's seat Driver's seat height adjustment motor
11 Plug connector
12 Plug connector
13 Plug connector
14 A Signal, seat backrest back Driver's seat Driver's backrest recliner motor
15 Plug connector
Pin assignments at plug connector X18840
Pin Type Description / Signal type Connection / Measuring notes
1 M Ground Lumbar support switch, driver's seat
2 Not used
3 A Voltage supply terminal 30 Lumbar support switch, driver's seat
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