Component Description Of Transfer Case Control Unit - GF28.19-P-3200VGE

Transmission 722.9 in model 463 

as of model year 2013 

View of transfer case control unit (except code 990 (AMG vehicles)) 

Location 

The transfer case control unit is located under the center console cover.

On CODE 990 (AMG vehicles), the "E" (Economy) transmission mode is replaced by the "C" (Controlled Efficiency) transmission mode.

Tasks in general 

The transfer case control unit monitors and shifts the transfer case according to:

• Vehicle speed
• Selector lever status
• Low Range button (N72s31) actuated
• Wheel speeds
• Automatic transmission oil temperature

The following control functions are performed by the transfer case control unit:

• Actuation of differential lock, transfer case
• Actuation of differential lock, front axle
• Actuation of differential lock, rear axle
• High/Low shift mechanism

CAN bus 

The transfer case control unit is connected to the CAN system of the vehicle through the drive train CAN (CAN-C).

Input and output signals 

The transfer case 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 

• Terminal 15
• Circuit 30
• Circuit 31
• Indicator switch for differential lock, longitudinal equalization (S76/7)
• Indicator switch for differential lock, rear axle (S76/8)
• Indicator switch for differential lock, front axle (S76/9)
• Differential lock button group (S76)

Direct output signals 

• Control solenoid valve for differential lock, transfer case (Y68)
• Control solenoid valve for differential lock, rear axle (Y68/1)
• Control solenoid valve for differential lock, front axle (Y68/2)
• Transfer case actuator motor (M46/2)
• Differential lock vacuum pump (M40)

CAN input signals 

Instrument cluster (A1) 

• Status of displayed vehicle speed

DIRECT SELECT INTERFACE (N150) 

• Status of DIRECT SELECT INTERFACE

CDI control unit (N3/9) or ME-SFI [ME] control unit (N3/10) 

• Engine speed
• Engine torque
• Pedal value

Steering column tube module control unit (N80) 

• Steering wheel angle status

Electronic Stability Program control unit (N30/4) 

• ABS request
• ESP® request
• Wheel speeds and direction of rotation

Fully integrated transmission control unit (Y3/8n4) 

• Actual/target gear
• Transmission mode request

Electronic ignition lock control unit (N73) 

• Drive authorization system (DAS) enable

SAM control unit (N10) 

• Diagnosis request

Trailer recognition control unit (N28/1) 

• Trailer recognition signal

CAN output signals 

Instrument cluster 

• Status of transfer case for multifunction display (A1p13)

CDI control unit or ME-SFI [ME] control unit 

• Transfer case status

Electronic Stability Program control unit 

• Transfer case status
• Differential lock status

SAM control unit 

• Differential lock status
• Transfer case LED status
• Diagnostic data

Fully integrated transmission control unit 

• Transfer case status
• Status, shift to "N"

	Wiring diagram for transfer case control unit	Transmission 722.9 in model 463 as of model year 2013	PE28.19-P-2101-97ZGA
		Transmission 722.9 in model 463.342 as of model year 2017	PE28.19-P-2101-97ZBA