GF32.33-P-3400FL Rear Axle Level Control System Control Unit, Component Description

GF32.33-P-3400FL Rear Axle Level Control System Control Unit, Component Description
- MODEL 212.2
- except CODE (489) AIRMATIC (air suspension with continuous damper adjustment)
- except CODE (488) Steel/air suspension





N97 Rear-axle electronic level control system control unit

Location
The electronic rear-axle level control system control unit is located below the footwell plate on the passenger-side.

Task
The electronic rear-axle level control system control unit is responsible for the following:
^ Reading in of sensors, pickups and signals
^ Evaluation of input factors
^ Actuation of components

Reading in of sensors, pickups and signals
The input factors are read in with the following connections:
^ Direct line
^ Chassis CAN (CAN E)

Direct line
The signals from the following components are read via a direct line:
- Left rear level sensor (B22/7)
- Right rear level sensor (B22/10)

Chassis CAN
The electronic rear-axle level control system control unit reads in the following information over the chassis CAN:
- Wake-up signal, from front SAM control unit with fuse and relay module (N10/1)
- Front wheel speeds provided by the Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or the Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS).
- Rotation angle, recorded by steering angle sensor (N49) and provided by steering column tube module control unit (N80)
- Atmospheric pressure and intake air temperature by CDI control unit (N3/9) (with diesel engine) or by ME-SFI control unit (N3/10) (with gasoline engine)

Evaluation of input factors
The input factors are evaluated by the microprocessor and the corresponding components are actuated.

Actuation of components
Components are actuated with the following connection:
^ Direct line

Direct line
The following components are actuated via direct lines:
- AIRmatic relay (K67) for actuating AIRmatic compressor (A9/1) with following components:
- Compressor (A9/1m1)
- AIRmatic pressure reduction valve (A9/1y1)
- Electronic level control system level control valve (Y36/8)