Tuesday, April 9, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 471


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.



6. 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 Heated Seat Module



DTC B1925 or B2170 (w/o HP2 with Memory)



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 B1925 02



- Left Seat Cushion Heater Sensor Circuit Shorted to Ground



DTC B1925 05



- Left Seat Cushion Heater Sensor Circuit Shorted to Battery or Open



DTC B2170 02



- Right Seat Heater Cushion Sensor Circuit Shorted to Ground



DTC B2170 05



- Right Seat Heater Cushion Sensor Circuit Shorted to Battery or Open



Diagnostic Fault Information



Circuit/System Description



The heated seat temperature sensor that set this diagnostic trouble code (DTC) is located in the seat cushion just under the seat cover with the seat



heating element. The rear heated seat module (RHSM) supplies a 5 V reference voltage through the temperature sensor signal circuit and a ground



through the low reference circuit to the sensor. The RHSM monitors the voltage of the sensor signal circuit to determine the temperature of the seat.



The temperature sensor varies in resistance based on the temperature of the heating element causing the signal voltage to change. Once the seat



reaches the set temperature, the RHSM will then cycle the control circuit of the heating elements ON and OFF in order to maintain the desired seat



temperature based on the feedback voltage from the sensor.

No comments:

Post a Comment