Hummer H3. Manual — part 1645

SCAN TOOL DATA DEFINITIONS

4WD High Indicator Light

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

4WD High Lock Indicator Light

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

4WD Low Active

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

4WD Low Lock Indicator Light

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

ATC Application

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

Encoder Circuits A, B, C and P

Data

Neutral Indicator Light

Transfer Case

Data

On/Off

Off

Rear Axle Lock

Transfer Case

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

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

This parameter displays Off if a high voltage is detected at the circuit. The parameter
displays On if the encoder motor grounds the circuit and pulls the voltage low. The encoder
circuits allow the transfer case shift control module to determine what position the transfer
case is in.

Encoder Gear Position

This parameter displays the mode the transfer case is currently in.

Encoder Supply Voltage

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

GM Part Number

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

Ign. Cycles Since Last Current DTC

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

Mode Switch Return Voltage

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

Mode Switch Selected

This parameter displays the transfer case shift control switch button currently depressed by
the driver.

Motor A High Side Driver

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

Motor A Low Side Driver

This parameter displays On when ground is applied to the Motor A Circuit. The scan tool

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

displays On or Off.

Motor B High Side Driver

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

Motor B Low Side Driver

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

Neutral Indicator Light

This parameter displays On when the transfer case shift control module commands the
neutral indicator light On. The scan tool displays On or Off.

Rear Axle Lock

This parameter displays On when the transfer case shift control module commands the rear
axle lock solenoid to be applied. The scan tool displays On or Off.

Rear Axle Lock Indicator Light

This parameter displays On when the transfer case shift control module requests the rear
axle lock indicator On. The scan tool displays On or Off.

Rear Axle Lock Request

This parameter displays On when the transfer case shift control module receives a rear axle
lock request from the transfer case shift control switch or a scan tool. The scan tool displays
On or Off.

Software ID

This parameter displays a numeric value indicating which version of software is currently
installed in the transfer case shift control module.

DIAGNOSTIC TROUBLE CODE (DTC) LIST

Diagnostic Trouble Code (DTC) List

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

DTC B0790

Circuit Description

The Neutral indicator circuit consists of a ignition 3 voltage circuit and a Neutral indicator
control circuit. When the Neutral mode has been selected by the driver, current is supplied to the
Neutral indicator by the ignition 3 voltage circuit, traveling through the Neutral indicator LED at
which time the transfer case shift control module supplies the ground through the Neutral
indicator control circuit. This DTC indicates an open, short to ground or a short to voltage.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B0790 Transfer Case Neutral Indicator Circuit Malfunction

Conditions for Running the DTC

The ignition is ON.

The system voltage is 9-18 volts.

Conditions for Setting the DTC

The system monitors the voltage on the Neutral indicator control circuit.

If the system detects a voltage 3.5 volts or less when the Neutral indicator is not
commanded, the DTC is logged.

If the system detects a voltage 3.5 volts or more when the Neutral indicator is commanded,
the DTC is logged.

Action Taken When the DTC Sets

Description

Module

DTC B0790

FT4WD

DTC B2725

FT4WD

DTC C0306

FT4WD

DTC C0327

FT4WD

DTC C0329

FT4WD

DTC C0359

FT4WD

DTC C0388, refer to DTC C0388

FT4WD

DTC C0550

FT4WD

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3