Transfer Case Shift Control Module Scan Tool Information. HUMMER H2 2008

For 1990-2009 cars only

Makes 🢒 HUMMER 🢒 2008 🢒 H2 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Transfer Case Shift Control Module Scan Tool Information

Table 1:	Scan Tool Data Parameters
Table 2:	Scan Tool Output Controls

Scan Tool Data Parameters

Parameter	Expected Value	Description
Operating Conditions: 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	Off	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	Off	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	No	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	Off	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	Number	This parameter displays the model number assigned to the transfer case. The scan tool displays a numeric value.
Encoder Circuit A	On	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 Circuit B	On
Encoder Circuit C	On
Encoder Circuit P	On
Encoder Gear Position	4WD High	This parameter displays the mode the transfer case is currently in.
Encoder Supply Voltage	2.55	This parameter displays the voltage supplied to the encoder motor. The scan tool displays a range of 0-25 volts.
Ign. Cycles Since Last Current DTC	Varies	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	0-5 V	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	Inactive	This parameter displays the transfer case shift control switch button currently depressed by the driver.
Motor A High Side Driver Status	Off	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 Status	Off	This parameter displays On when ground is applied to the Motor A Circuit. The scan tool displays On or Off.
Motor B High Side Driver Status	Off	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 Status	Off	This parameter displays On when ground is applied to the Motor B Circuit. The scan tool displays On or Off.
Neutral Indicator Light	Off	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	Off	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 Lamp	Off	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	Off	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	Part Number	This parameter displays a numeric value indicating which version of software is currently installed in the transfer case shift control module.

Scan Tool Output Controls

Output Control	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.