B2430

DTC B2430

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




DIAGNOSTIC FAULT INFORMATION

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

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 300mS.
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 300mS.
B2425/B2430 1F: The temperature sensor voltage is erratic or changes 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 seat back heating element harness connector.
2. Test for less than 6.0 ohms of resistance between the supply voltage terminal and the control terminal of the heater element.
- If greater than 6.0 ohms, replace the seat back heating element.
3. Connect the seat back heating element harness connector.
4. Disconnect the heated seat module harness connectors C2 and C4.
5. Test for less than 6.0 ohms of resistance between the heating element supply voltage circuit and the heating element control circuit of the seat heating elements.
- If greater than 6.0 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.
6. Test the supply voltage circuit of the seat heating elements for a short to battery voltage.
7. Test the control circuit of the seat heating elements for a short to ground.
8. If all circuits/connections circuits test normal, replace the heated seat module.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic repair varification after completing the diagnostic procedure.

- Seat Back Heater Element Replacement - Front (Impala) Seat Back Heater Element Replacement - Front (Monte Carlo)
- Seat Cushion Heater Element Replacement - Front (Impala) Seat Cushion Heater Element Replacement - Front (Monte Carlo)
- Control Module References for Heated Seat Control Module Replacement-Front.