Friday, July 12, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 604


DTC B2725 08



- Active Transfer Case Mode Switch Circuit - Signal Invalid



Diagnostic Fault Information



Circuit/System Description



The transfer case shift control switch (TCSCS) has 3 modes. The transfer case shift control module (TCCM) supplies a regulated 5 V DC to the



switch through the 5-volt reference circuit. The current travels through the specific resistor of the currently selected mode, each mode has its own



resistor. The current is then returned to the TCCM through the switch signal circuit.



The TCCM continuously monitors the switch signal circuit to determine whether a mode change has been requested by the driver.



The NP0 transfer case has the following 3 modes:



* 2 Hi



* 4WD Auto



* 4 Hi



Conditions for Running the DTC



* Ignition ON.



* System voltage 10.5-18 V.



Conditions for Setting the DTC



* The system constantly monitors the voltage on switch signal circuit.



* If the system detects a voltage level under 0.38 volts or greater than 4.86 volts for 60 seconds, the DTC is logged.



Action Taken When the DTC Sets



* All shifting is disabled.



* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.



* Failure Records will be stored.



Conditions for Clearing the DTC



* The TCCM will clear the current DTC once the conditions for setting the DTC are no longer present.



* A history DTC clears after 40 consecutive warm up cycles without a fault present.



* History DTCs can be cleared using a scan tool.



Diagnostic Aids



EL-49742 - harness is a good source for B+ and ground.



Reference Information



Schematic Reference



Transfer Case Control Schematics (See: Transmission and Drivetrain/Transfer Case/Diagrams/Electrical Diagrams/MP 3023/3024-NQH - Transfer



Case)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)

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