456019 Removing and installing steering-angle sensor for PSM
WM 456019 Removing and installing steering-angle sensor for PSM
Technical values
Information
The steering-angle sensor is integrated into the steering-column switch. The steering angle is recorded in the airbag contact unit (spring).
Only replace the steering-angle sensor together with the airbag contact unit (spring) and electronic unit.
Steering-angle sensor
Diagram of steering-column switch
Preliminary work
1. Remove airbag unit => Removing and installing driver's airbag unit
2. Remove steering wheel => Removing and installing steering wheel
Removing
WARNING
Airbag contact unit not set correctly
- Malfunction in driver's airbag unit
-> When removing and installing the steering column switch, turn the steering wheel so that the wheels are in straight-ahead position. This ensures that the airbag contact unit is locked in the central position.
-> Do not trap the cable of the airbag contact unit.
-> Check that the cable is routed correctly.
Information
If the airbag contact unit setting was changed accidentally, it must be adjusted. To position the airbag contact unit in the central position, press the locking element and turn the rotor carefully to the left as far as it will go. Then turn the rotor carefully to the right, approx. 3.5 to 3.75 revolutions, until the lock engages. The arrow marking on the rotor must be positioned between the arrow markings on the contact unit.
1. Remove steering-column panels.
1.1. Remove lower steering-column panel -3-.
Steering-column panels
Unscrew screws -1- and unclip cable clamp -2-.
Move steering-wheel adjustment lever to a vertical position and remove lower steering-column panel -3-.
1.2. Remove upper steering-column panel -4-.
Steering-column switch
Unclip upper steering-column panel -4- , see -arrows- , and disconnect electric plug connection.
2. Remove steering-column switch.
Steering-column switch, bottom
Unscrew screw -1- , unclip cable guide -2- , pull out electric plug connections and remove steering-column switch.
3. Remove airbag contact unit (spring) from steering-column switch.
Information
Ensure that arrow -A- on the rotor is positioned between the markings -B- of the arrows -C- on the airbag contact unit and that the locking element -D- is engaged.
Airbag contact unit marking
Unclip airbag contact unit (spring) -arrows- and carefully remove it.
Airbag contact unit
Replacing steering-angle sensor for PSM
Replacing
The steering-angle sensor can only be replaced together with the airbag contact unit -E- and electronic unit -F-.
Diagram of steering-column switch
1. Replace the steering-angle sensor.
Replace the airbag contact unit (spring)/steering-angle sensor -E- and electronic unit -F-.
Installing steering-angle sensor for PSM
Installing
Steering-angle sensor
1. Install in reverse order.
2. Install steering-column switch.
Subsequent work
1. Install steering wheel => Removing and installing steering wheel.
2. Install airbag unit => Removing and installing driver's airbag unit.
3. Initialise and calibrate steering-angle sensor -> 456000 Initialising and calibrating steering-angle sensor Testing and Inspection.