B2435

DTC B2435

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
DTC B2435 02: Left Seat Heater Cushion Sensor Circuit Shorted to Ground
DTC B2435 05: Left Seat Heater Cushion Sensor Circuit Shorted to Battery or Open
DTC B2440 02: Right Seat Heater Cushion Sensor Circuit Shorted to Ground
DTC B2440 05: Right Seat Heater Cushion Sensor Circuit Shorted to Battery or Open




DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the prior to using this diagnostic procedure.

CIRCUIT/SYSTEM DESCRIPTION
The heated seat module controls the seat temperature by providing a ground for the seat heater elements. The module then monitors the current flow through the heating elements and the temperature sensor rate of change to verify correct operation.

CONDITIONS FOR RUNNING THE DTC
The heated seat module is active, and none of the power diagnostic DTCs are current.

CONDITIONS FOR SETTING THE DTC
B2435/B2440 02: The temperature sensor voltage drops below 0.80 volts for more than 1 second.
B2435/B2440 05: The temperature sensor voltage exceeds 5 volts for more than 1 second.

ACTION TAKEN WHEN THE DTC SETS
The heated seat function for the affected seat 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.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the heated seat module harness connectors C2 and C4.
2. Test for 850-12.0K ohms of resistance between the signal circuit and the low reference circuit of the seat back temperature sensor.
- If greater than 12.0K ohms, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits/connections test normal, replace the heated seat back temperature sensor/heating element.
- If less than 850 ohms, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the heated seat back temperature sensor/heating element.
3. If all circuits/connections test normal, replace the heated seat module.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Seat Back Cover and Pad Replacement - Front
- Control Module References for the rear heated seat module replacement, setup, and programming