Wednesday, June 19, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 512


Important: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat



unoccupied, then with the seat occupied.



2. Test for 2.0 - 8.0 Ohms between control circuit terminal 6 and control circuit terminal 2.



锟斤拷 If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the seat cushion heater



element.



锟斤拷 If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the seat cushion



heater element.



3. Disconnect the X2, X4 harness connectors at the HSM.



4. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 20 X4 and the low reference circuit terminal 8 X2.



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



cushion heater element/temperature sensor.



锟斤拷 If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits



test normal, replace the seat cushion heater element/temperature sensor.



5. Connect the X1, X2, X4 harness connectors at the HSM.



6. Disconnect the harness connector at the seat cushion heater element/temperature sensor.



7. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



HSM.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.



8. If all circuits test normal, replace the HSM.



Repair Instructions



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



* 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 HSM replacement, setup, and programming



Rear Seat



DTC B2425 or B2430 (Rear Seat)



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 B2425 04



- Left Seat Heater Cushion Circuit Open



DTC B2425 0A



- Left Seat Heater Cushion Circuit Rate of Change Below Threshold



DTC B2425 0B



- Left Seat Heater Cushion Circuit Current Above Threshold



DTC B2425 0C



- Left Seat Heater Cushion Circuit Current Below Threshold



DTC B2425 0D



- Left Seat Heater Cushion Circuit Resistance Above Threshold



DTC B2425 0E



- Left Seat Heater Cushion Circuit Resistance Below Threshold

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