Component description of rear axle differential lock control unit - GF28.19-P-3500VG

MODEL 164.1 with ENGINE 156, 272, 273, 629, 642 with TRANSMISSION 722.9 as of Model Year 09/Modification Year 08 model refinement package with CODE (430) Off-road package 

MODEL 164.8 with ENGINE 273, 629, 642 with TRANSMISSION 722.9 as of Model Year 09/Modification Year 08 with CODE (430) Off-road package 

View of trunk floor from left 

Location 

The rear axle differential lock control unit is located on the trunk floor on the left in the direction of travel.

Task 

General 

The rear axle differential lock control unit is responsible for actuating the multi-disk clutch (interwheel differential lock) in the rear axle differential in order to guarantee the distribution of the engine torque between the left and right rear wheels.

The following control functions are performed by the rear axle differential lock control unit:

• Torque interface
• Compensation process
• Lock protection function
• Plausibility monitoring
• Diagnosis
• Flash programming
• Run-on function

CAN data bus 

The rear axle differential lock control unit is connected to the CAN system of the vehicle via the engine compartment CAN (CAN-C).

Input and output signals 

The rear axle differential lock control unit evaluates the following input signals and issues the corresponding output signals:

• Direct input signals 
• Direct output signals 
• CAN input signals 
• CAN output signals 

Direct input signals 

• Circuit 15
• Circuit 30
• Circuit 31
• Hall sensor 1 signal - Rear axle differential actuator motor (M70)
• Hall sensor 2 signal - Rear axle differential actuator motor
• Motor temperature - Rear axle differential actuator motor

Direct output signals 

• Sensor supply (5V)
• Hall sensor 1 and 2 sensor ground - Rear axle differential actuator motor
• Temperature sensor ground - Rear axle differential actuator motor
• Actuator motor actuation - Rear axle differential actuator motor
• Engine brake actuation - Rear axle differential actuator motor

CAN input signals 

Central gateway control unit (N93) 

• Diagnosis request

Transfer case control unit (N15/7) 

• Specified locking torque

CAN output signals 

Central gateway control unit (N93) 

• Diagnostic data

Transfer case control unit (N15/7) 

• Actual value of rear differential lock

	Wiring diagram for transfer case control unit	N15/7	PE28.19-P-2101-99MAA
	Wiring diagram for rear differential lock control unit	N15/9	PE35.40-P-2101-99MAA