1 | Driver seat frame |
N45 | All-wheel drive control unit |
D28.19-A008-05
Location
The all-wheel drive control unit is located in the driver seat frame.
Task
The all-wheel drive control unit receives information from the following component parts over discrete lines:
All-wheel drive activation button (S76/11), status on vehicles with code ZG1 (All-wheel drive, engageable) and on vehicles with code ZG3 (Engageable all-wheel drive with transmission ratio)
All-wheel drive reduction switch (S76/12), status on vehicles with code ZG3 (Engageable all-wheel drive with transmission ratio)
Transfer case absolute sensor (B57), actual position of selector drum
Transfer case actuator motor (M46/2), turn rate and direction of rotation of transfer case actuator motor
The all-wheel drive control unit actuates the transfer case actuator motor over a discrete line by means of a pulse width modulated signal (PWM).
The all-wheel drive control unit receives information over the suspension FlexRay (Flex E) on the following component parts:
Status of clutch pedal switch (S40/6)
Status of Electronic Stability Program (ESP®)
Status of brake light switch (S9/1)
The all-wheel drive control unit sends information over the suspension FlexRay (Flex E) to the following component parts:
Instrument cluster (A1), status of transfer case, step-down ratio switched on or off, on vehicles with code ZG3 (Engageable all-wheel drive with transmission ratio)
ESP® control unit, status of transfer case, transmission ratio switched on or off, on vehicles with code ZG3 (Engageable all-wheel drive with transmission ratio)
ESP® control unit, status of transfer case, all-wheel drive switched on or off, on vehicles with code ZG3 (Engageable all-wheel drive with transmission ratio) and on vehicles with code ZG1 (All-wheel drive, engageable)
If the transmission ratio is switched on and engaged in vehicles with code ZG3 (Engageable all-wheel drive with transmission ratio), the LOW RANGE indicator lamp (A1e37) is actuated in the instrument cluster.
If, on vehicles with code ZG3 (Engageable all-wheel drive with transmission ratio) or with code ZG1 (All-wheel drive, engageable), the all-wheel drive is switched on successfully in the all-wheel drive activation button (S76/11), an LED is illuminated to confirm that the all-wheel drive is activated.