Saturday, April 13, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 559


Before the heated seats are activated, the MSM detects a short to ground on the seat heating element supply voltage circuit or control circuit.



B2508 01



Before the heated seats are activated, the MSM detects a short to battery voltage on the seat heating element supply voltage circuit or control circuit.



Action Taken When the DTC Sets



The heated seat function for both seats will be disabled.



Conditions for Clearing the DTC



* The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.



* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.



Reference Information



Schematic Reference



Heated/Cooled Seat Schematics ()



Connector End View Reference



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



Description and Operation



Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()



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)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Verify the type of vehicle and the heated seat system for which the DTC set.



If the DTC set in a vehicle equipped with memory, refer to Circuit/System Testing below.



If the DTC set in a hybrid vehicle without memory, refer to DTC B2508 or B2509 (HP2 w/o memory).



If the DTC set in a non-hybrid vehicle without memory, refer to DTC B2508 or B2509 (Dealer installed).



If the DTC set in the rear heated seat module, refer to DTC B2508 or B2509 (Rear seat).



Circuit/System Testing



1. Ignition OFF, disconnect the X1, X4 harness connectors at the MSM.



2. Test for infinite resistance between the control circuit terminal 14 X1 and ground.



锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Driver seat cushion and back element terminal 14 X1



* Driver seat cushion element terminal 11 X1



* Driver seat back element terminal 1 X1



3. Test for infinite resistance between the control circuit terminal 6 X1 and ground.



锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Passenger seat cushion and back element terminal 6 X1



* Passenger seat cushion element terminal 14 X4



* Passenger seat back element terminal 4 X1



4. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 X1 and ground.

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