Removal and Replacement
WM 456019 Removing and installing steering-angle sensor for PSM
Information
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
A - Direction indicator switch
B - On-board computer switch
C - Wiper switch
D - Cruise control switch
E - Airbag contact unit (spring)/steering-angle sensor
F - Electronic unit
Preliminary work
Preliminary work
1. Remove airbag unit.
2. Remove steering wheel.
Removing
Caution: Malfunction
^ Fault in airbag contact unit (spring)!
--> Airbag contact unit (spring) must not be twisted.
1. Remove steering-column panels.
1.1. Remove lower steering-column panel -3-.
Unscrew screws -1- and unclip cable clamp -2-.
Move steering-wheel adjustment lever to a vertical position and remove lower steering-column panel -3-.
Steering-column panels
1.2. Remove upper steering-column panel -4-.
Unclip upper steering-column panel -4-, see -Arrows-, and disconnect electric plug connection.
Steering-column switch
2. Remove steering-column switch.
Unscrew screw -1-, unclip cable guide -2-, pull out electric plug connections and remove steering-column switch.
Steering-column switch, bottom
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
A - Direction indicator switch
B - On-board computer switch
C - Wiper switch
D - Cruise control switch
E - Airbag contact unit (spring)/steering-angle sensor
F - Electronic unit
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
Subsequent work
1. Install steering wheel.
2. Install airbag unit.
3. Initialize and calibrate steering-angle sensor.