Left Rear Seat Control Unit, Component Description - GF91.29-P-5285LF
Model 222 With Code 223 (Electric backrest adjustment and head restraints)
Shown model 222.0
Location
The left rear seat control unit is located in the left rear in the trunk.
Task
The left rear seat control unit has the following tasks:
- Control of the seat adjustment
- Storing of the memory settings for the rear seat
- Actuation of collision avoidance
The tasks are subdivided as follows:
- Read in sensors and signals
- Evaluation of input factors
- Actuation of components
Read in sensors and signals
The input factors are read in via the following connections:
- Direct line
- Interior CAN (CAN B)
Direct line
The left rear seat control unit reads in the signals of the following component parts via direct lines:
- Left rear seat head restraint height adjustment Hall sensor (M18/13b1)
- Left rear seat head restraint inclination adjustment Hall sensor (M18/15b1)
- Left rear seat cushion inclination adjustment Hall sensor (M18/19b1)
- Left rear seat leg rest inclination adjustment Hall sensor (M18/23b1) (with code 453 (Rear reclining seats))
- Left rear seat leg rest fore/aft adjustment Hall sensor (M18/25b1) (with code 453 (Rear reclining seats))
- Left rear seat backrest inclination adjustment Hall sensor (M27/11b1)
Interior CAN
The signals read in by the left rear seat control unit via the interior CAN include the following:
- Seat adjustment request
- Request for storing/moving to memory position
- Request for seat heater (with code 402 (Rear comfort seats, incl. seat heating and seat ventilation) or code P43 (Rear seat comfort package))
- Request for seat ventilation (with code 402 (Rear comfort seats, incl. seat heating and seat ventilation))
- Request for PRE-SAFE® positioning function (with code 305 (Rear PRE-SAFE))
Evaluation of input factors
The read in input factors are evaluated by the left rear seat control unit. The motors for seat adjustment are actuated via integrated relays.
Actuation of components
The actuation of the components takes place via the following connections:
- Direct line
- Left rear seat LIN (LIN B20) (With Code P43 (Rear seat comfort package))
- Interior CAN
Direct line
The left rear seat control unit actuates the following component parts via direct lines:
- Left rear seat head restraint height adjustment motor (M18/13)
- Left rear seat head restraint inclination adjustment motor (M18/15)
- Left rear seat cushion inclination adjustment motor (M18/19)
- Left rear seat leg rest inclination adjustment seat adjustment motor (M18/23) (with code 453 (Rear reclining seats))
- Left rear seat leg rest fore/aft adjustment seat adjustment motor (M18/25) (with code 453 (Rear reclining seats))
- Left rear seat backrest inclination adjustment motor (M27/11)
- With code 402 (Rear comfort seats, incl. seat heating and seat ventilation):
- Left rear seat backrest ventilation motors (M18/7)
- Left rear seat cushion ventilation motors (M18/8)
- With code 402 (Rear comfort seats, incl. seat heating and seat ventilation) or code P43 (Rear seat comfort package):
- Left rear seat surface heater pad (R13/5)
- Left rear backrest heater pad (R13/6)
Left rear seat LIN (With Code P43 (Rear seat comfort package))
The left rear seat control unit communicates via the left rear seat LIN with the left rear seat, seat heating control unit (N25/11).
Interior CAN
The signals sent by the left rear seat control unit via the interior CAN include the following:
- Request for acknowledge tone after storage in memory
- Seat position status
- Seat heater status (with code 402 (Rear comfort seats, incl. seat heating and seat ventilation) or code P43 (Rear seat comfort package))
- Seat ventilation status (with code 402 (Rear comfort seats, incl. seat heating and seat ventilation))
Variants
There are no variants for the hardware of the left rear seat control unit. The country or left-hand drive vehicle/right hand drive vehicle allocation is software coded.
| Wiring diagram for left rear seat control unit | Model 222 up to model year 2018 with code 223 (Electric backrest adjustment and head restraints) | PE91.29-P-2106-97SEA | |
| Model 222 as of model year 2018 with code 223 (Electric backrest adjustment and head restraints) | PE91.29-P-2106-97SEB |