Hummer H2. Manual - part 2651

 

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Hummer H2. Manual - part 2651

 

 

SCAN TOOL OUTPUT CONTROLS 

Scan Tool Output Controls 

SCAN TOOL DATA LIST 

Does the scan tool display any 
DTCs?

Go to Step 8

Go to Symptoms - Transfer 

Case

8

Does the scan tool display any 
DTCs which begin with a "U"?

Go to Scan Tool Does Not 

Communicate with Class 2 

Device in Data Link 

Communications

Go to Step 9

9

Does the scan tool display DTC 
P0502 or P0503?

Go to Applicable Powertrain 

OBD Diagnostic System Check

Go to Diagnostic Trouble 

Code (DTC) List

Scan Tool 

Output Control

Additional 

Menu 

Selections

Description

Refer to the scan tool manual for complete scan tool operating instructions.

4WD High 

Indicator Light

-

This function allows the technician to command the 4WD high 
indicator light, within the transfer case shift control switch, on or off.

4WD High Lock 

Indicator Light

-

This function allows the technician to command the 4WD high lock 
indicator light, within the transfer case shift control switch, on or off.

4WD Low Lock 

Indicator Light

-

This function allows the technician to command the 4WD low lock 
indicator light, within the transfer case shift control switch, on or off.

Differential 

Lock Indicator 

Light

-

This function allows the technician to command the differential 
indicator light, within the transfer case shift control switch, on or off.

Motor A Driver 

- High

-

This function allows the technician to request the high side driver for 
the motor control A circuit, thus allowing the technician to test the 
circuit and the transfer case shift control module for their ability to 
provide battery voltage to the motor.

Motor A Driver 

- Low

-

This function allows the technician to request the low side driver for 
the motor control A circuit, thus allowing the technician to test the 
circuit and the transfer case shift control module for their ability to 
provide a ground path for the motor.

Motor B Driver - 

High

-

This function allows the technician to request the high side driver for 
the motor control B circuit, thus allowing the technician to test the 
circuit and the transfer case shift control module for their ability to 
provide battery voltage to the motor.

Motor B Driver - 

Low

-

This function allows the technician to request the low side driver for 
the motor control B circuit, thus allowing the technician to test the 
circuit and the transfer case shift control module for their ability to 
provide a ground path for the motor.

Neutral Indicator 

Light

-

This function allows the technician to command the neutral indicator 
light, within the transfer case shift control switch, on or off.

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

Scan Tool Data List 

Scan Tool Parameter

Data List

Units Displayed

Typical Data 

Value

Engine is at Idle, Upper Radiator Hose is Hot, Closed Throttle, Gear is in Park or Neutral, and 

Accessories are OFF.

4WD High Indicator Light

Transfer Case 

Data

On/Off

Off

4WD High Lock Indicator Light

Transfer Case 

Data

On/Off

Off

4WD Low Active

Transfer Case 

Data

Yes/No

No

4WD Low Lock Indicator Light

Transfer Case 

Data

On/Off

Off

ATC Application

Transfer Case 

Data

Number

Number

Encoder Circuit A

Transfer Case 

Data

On/Off

On

Encoder Circuit B

Transfer Case 

Data

On/Off

On

Encoder Circuit C

Transfer Case 

Data

On/Off

On

Encoder Circuit P

Transfer Case 

Data

On/Off

On

Encoder Gear Position

Transfer Case 

Data

4WD High/4WD 

Low/AWD

4WD High

Encoder Supply Voltage

Transfer Case 

Data

Volts

2.55

Ign. Cycles Since Last Current 
DTC

Transfer Case 

Data

Count

Varies

Mode Switch Return Voltage

Transfer Case 

Data

Volts

0-5 V

Mode Switch Selected

Transfer Case 

Data

Transfer Case Mode

Inactive

Motor A High Side Driver Status

Transfer Case 

Data

On/Off

NO

Motor A Low Side Driver Status

Transfer Case 

Data

On/Off

NO

Motor B High Side Driver Status

Transfer Case 

Data

On/Off

NO

Motor B Low Side Driver Status

Transfer Case 

Data

On/Off

NO

Neutral Indicator Light

Transfer Case 

Data

On/Off

Off

Transfer Case 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

SCAN TOOL DATA DEFINITIONS 

4WD High Indicator Light  

The scan tool displays On or Off. This parameter indicates On when the transfer case shift control module 
commands the rear 4WD high indicator light On. 

4WD High Lock Indicator Light  

The scan tool displays On or Off. This parameter indicates On when the transfer case shift control module 
commands the rear 4WD high lock indicator On. 

4WD Low Active  

The scan tool displays Yes or No. This parameter indicates Yes when the transfer case is currently in the 
4WD low lock mode. 

4WD Low Lock Indicator Light  

The scan tool displays On or Off. This parameter indicates On when the transfer case shift control module 
commands the rear 4WD low lock indicator light On. 

ATC Application  

The scan tool displays a numeric value. This parameter indicates the model number assigned to the 
transfer case. 

Encoder Circuits A, B, C, and P  

The scan tool displays On or Off. If a high voltage is detected then the circuit is Off. If the encoder motor 
grounds the circuit and pulls the voltage low then the circuit is On. The encoder circuits allow the transfer 
case shift control module to determine what position the transfer case is in. 

Encoder Gear Position  

The scan tool displays the mode the transfer case is currently in. 

Encoder Supply Voltage  

Rear Axle Lock

Data

On/Off

Off

Rear Axle Lock Indicator Lamp

Transfer Case 

Data

On/Off

Off

Rear Axle Lock Request

Transfer Case 

Data

On/Off

Off

Software ID

Transfer Case 

Data

Part Number

Part Number

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

The scan tool displays a range from 0-25 volts. This parameter indicates the voltage supplied to the 
encoder motor. 

GM Part Number  

The scan tool displays a numeric value. This parameter indicates the GM part number assigned to the 
module package (module, software, and calibrations). 

Ign. Cycles Since Last Current DTC  

The scan tool displays a numeric value. This parameter indicates how many ignition cycles have occurred 
since last current DTC was set. 

Mode Switch Return Voltage  

The scan tool displays a range of 0-5 volts. This parameter indicates the return voltage from the transfer 
case shift control switch. 

Mode Switch Selected  

The scan tool displays the current mode selected. This parameter indicates the transfer case shift control 
switch button currently depressed by the driver. 

Motor A High Side Driver  

The scan tool displays On or Off. This parameter indicates On when battery voltage is applied to the 
Motor A circuit. 

Motor A Low Side Driver  

The scan tool displays On or Off. This parameter indicates On when ground is applied to the Motor A 
circuit. 

Motor B High Side Driver  

The scan tool displays On or Off. This parameter indicates On when battery voltage is applied to the 
Motor B circuit. 

Motor B Low side Driver  

The scan tool displays On or Off. This parameter indicates On when ground is applied to the Motor B 
circuit. 

Neutral Indicator Light  

The scan tool displays On or Off. This parameter indicates On when the transfer case shift control module 

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

 

 

 

 

 

 

 

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