Tuesday, April 16, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 487


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



* Passenger seat cushion and seat back 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 control circuit terminal 14 X1 and ground.



锟斤拷 If the test lamp illuminates, test the control circuits listed below for a short to voltage:



* Driver seat cushion and seat back terminal 14 X1



* Driver seat cushion element terminal 11 X1



* Driver seat back element terminal 1 X1



5. Verify that a test lamp does not illuminate between the control circuit terminal 6 X1 and ground.



锟斤拷 If the test lamp illuminates, test the control circuits listed below for a short to voltage:



* Passenger seat cushion and seat back terminal 6 X1



* Passenger seat cushion element terminal 14 X4



* Passenger seat back element terminal 4 X1



6. If all circuits test normal, replace the MSM.



B2345 13



1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.



2. Test for greater than 850 ohms between the signal circuit and the low reference circuits listed below:



* Driver seat cushion terminal 1 X5 and terminal 3 X2



* Passenger seat cushion terminal 2 X5 and terminal 6 X2



锟斤拷 If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the



appropriate seat cushion heater element/temperature sensor.



3. Test for greater than 850 ohms between the signal and the low reference circuits listed below:



* Driver seat back terminal 4 X5 and terminal 2 X2



* Passenger seat back terminal 3 X5 and terminal 5 X2



锟斤拷 If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the



appropriate seat back heater element/temperature sensor.



4. If all circuits test normal, replace the MSM.



B2345 42 or B2345 4B



If either DTC is set, replace the MSM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater



Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()



* Driver or Passenger Seat Cushion Heater Replacement (without HP2) ()Driver or Passenger Seat Cushion Heater Replacement (with HP2)



()



* Control Module References (See: Testing and Inspection/Programming and Relearning) for the MSM replacement, setup, and programming



Dealer Installed



DTC B2345 (Dealer Installed)



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

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