B2425

DTC B2425

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
DTC B2425 04: Left Seat Back Heater Circuit Open
DTC B2425 0A: Left Seat Back Heater Circuit Rate of Change Below Threshold
DTC B2425 0B: Left Seat Back Heater Circuit Current Above Threshold
DTC B2425 1F: Left Seat Back Heater Circuit Intermittent
DTC B2430 04: Right Seat Back Heater Circuit Open
DTC B2430 0A: Right Seat Back Heater Circuit Rate of Change Below Threshold
DTC B2430 0B: Right Seat Back Heater Circuit Current Above Threshold
DTC B2430 1F: Right Seat Back Heater Circuit Intermittent




DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
When the heated seat function is active, the heated seat module supplies battery voltage through the element supply voltage circuit to the seat heater elements. The module controls the seat temperature by providing a ground through the heated seat element control circuit to the seat heater elements. The module then monitors the current flow through the heating element 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
The following conditions exist for more than 1 second:
B2425/B2430 04: The module does not detect a temperature change within 30 seconds.
B2425/B2430 0A: The module detects that the set point temperature has not been reached within 5 minutes.
B2425/B2430 0B: By measuring output current, the heated seat module calculates that the heating element resistance is below the minimum resistance for more than 300 mS.
B2425/B2430 0C: By measuring output current, the heated seat module calculates that the heating element resistance is above the maximum resistance for more than 300 mS.
B2425/B2430 1F: The temperature sensor voltage is erratic or change suddenly.

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 connector C1.
2. Test for less than 6 ohms of resistance between the heating element supply voltage circuit and the heating element control circuit of the appropriate seat cushion heating element.
- If greater than 6 ohms, test the supply voltage circuit and the control circuit for an open/high resistance. If the circuits/connections test normal, replace the seat cushion heating element.
3. Test the supply voltage circuit of the seat cushion heating element for a short to battery voltage.
4. Test the control circuit of the seat cushion heating element for a short to ground.
5. 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 Cushion Trim Cover and Pad Replacement
- Control Module References for the rear heated seat module replacement, setup, and programming