Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Transfer Case Shift Control Switch Replacement (Without SLT) (See: Powertrain Management/Transmission Control Systems/Sensors and
Switches - Transmission and Drivetrain/Sensors and Switches - Transfer Case/Four Wheel Drive Selector Switch/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for TCSCM replacement, setup, and programming
* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related Diagnostic
Procedures/MP 3023/3024-NQH - Transfer Case/Transfer Case High/Low Clutch Reset)
MP 3010-NP0 - Transfer Case
DTC B0785
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0785 01
- 2 High Indicator Circuit Short to Battery
DTC B0785 06
- 2 High Indicator Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit/System Description
The 2 High indicator circuit consists of a light emitting diode (LED), a LED feed circuit and a LED control circuit. The indicator dimming control
circuit is the LED feed circuit and continuously supplies voltage to the 2 High, Auto 4WD, and 4 High LEDs. When the 2 High mode has been
selected by the driver, the transfer case shift control module (TCCM) provides a ground through the 2 High indicator control circuit illuminating the
LED. The TCCM tests the 2 High indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming
control circuit by grounding the 2 High indicator control circuit for 2 seconds during the bulb test at key ON.
Conditions for Running the DTC
B0785 01
* Ignition ON
* System voltage 10-18 V
* Instrument panel lights not dimmed.
* Daylight running lights MUST be commanded ON.
* Circuit tested when the 2 High indicator is commanded ON.
B0785 06
* Ignition ON
* System voltage 10-18 V
* Instrument panel lights not dimmed.
* Daylight running lights MUST be commanded ON.
* Circuit tested when the 2 High indicator is commanded OFF.
Conditions for Setting the DTC
