2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 3 X5 and the low reference circuit terminal 5 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
back 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 back heater element/temperature sensor.
3. Connect the X2, X5 harness connectors at the MSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. 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
MSM.
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 MSM.
6. If all circuits test normal, 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) ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the MSM replacement, setup, and programming
HP2 or Dealer Installed W/O Memory
DTC B2435 or B2440 (HP2 or Dealer Installed w/o 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 B2435 02
- Left Seat Back Heater Sensor Circuit Short to Ground
DTC B2435 05
- Left Seat Back Heater Sensor Circuit Short to Battery or Open
DTC B2440 02
- Right Seat Back Heater Sensor Circuit Short to Ground
DTC B2440 05
- Right Seat Back Heater Sensor Circuit Short to Battery or Open
Diagnostic Fault Information
