Sunday, November 3, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 254


锟斤拷 If the indicator does not illuminate when tested or the incorrect indicator illuminates, replace the TCSCS.



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 3023/3024-NQH - Transfer Case



DTC B0775



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 B0775 01



- 4WD HI Indicator Circuit Short to Battery



DTC B0775 06



- 4WD HI Indicator Circuit Short to Ground or Open



Diagnostic Fault Information



Circuit/System Description



The 4WD HI indicator circuit consists of a light emitting diode (LED) feed circuit, a LED and a LED control circuit. The indicator dimming control



circuit is the LED feed circuit and continuously supplies B+ to the 2WD HI, 4WD Auto, 4WD HI and 4WD LO LEDs. When the 4WD HI mode has



been selected by the driver, the transfer case shift control module (TCCM) provides a ground through the 4 HI indicator control circuit illuminating



the LED.



The TCCM tests the 4WD HI indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming control



circuit by grounding the 4WD HI indicator control circuit for 2 seconds during the Bulb Test at key ON.



Conditions for Running the DTC



B0775 01



* Ignition ON



* System voltage 10-18 V



* Instrument panel lights not dimmed.



* Daylight running lights MUST be commanded ON.



* Circuit tested when the 4WD HI indicator is commanded ON.

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