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B2430



DTC B2425 or B2430

DTC DESCRIPTORS

DTC B2425 04: Left Seat Heater Cushion Circuit Open

DTC B2425 0A: Left Seat Heater Cushion Circuit Rate of Change Below Threshold

DTC B2425 0B: Left Seat Heater Cushion Circuit Current Above Threshold

DTC B2425 0C: Left Seat Heater Cushion Circuit Current Below Threshold

DTC B2425 1F: Left Seat Heater Cushion Circuit Intermittent

DTC B2430 04: Right Seat Heater Cushion Circuit Open

DTC B2430 0A: Right Seat Heater Cushion Circuit Rate of Change Below Threshold

DTC B2430 0B: Right Seat Heater Cushion Circuit Current Above Threshold

DTC B2430 0C: Right Seat Heater Cushion Circuit Current Below Threshold

DTC B2430 1F: Right Seat Heater Cushion Circuit Intermittent

DIAGNOSTIC FAULT INFORMATION




Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

CIRCUIT/SYSTEM DESCRIPTION
The left and right heated seats are controlled by the memory seat module (MSM). When active, power is applied to the seat cushion and back heater elements through a common voltage supply circuit. Each individual heater element is grounded by the MSM through separate low side drive control circuits. The heater element control circuits are pulse width modulated to ground by the module in order to control the seat temperature by regulating the current flow through the heater elements. The module then monitors the current flow through the heating elements and the of rate change of the temperature sensors to verify correct heated seat operation.

CONDITIONS FOR RUNNING THE DTC
The memory seat module must be powered.

CONDITIONS FOR SETTING THE DTC

B2425/B2430 04
The module does not detect a temperature change for up to 210 seconds.

B2425/B2430 0A
The module detects that the set point temperature has not been reached for up to 8.5 minutes.

B2425/B2430 0B
By measuring the current and voltage output to the seat cushion heating element every 10 seconds, the memory seat module calculates that the heating element resistance is below the minimum resistance value of 2.0 ohms.

B2425/B2430 0C
By measuring the current and voltage output to the seat cushion heating element every 10 seconds, the memory seat module calculates that the heating element resistance is above the maximum resistance value of 6.5 ohms.

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 will clear and set the code to history, 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

B2425 Driver Seat Cushion
1. Ignition OFF, disconnect the (C1) harness connector at the memory seat module.
2. Test for less than 6.5 ohms of resistance between the seat cushion heater element supply voltage circuit terminal 14 and the control circuit terminal 11.
- If greater than 6.5 ohms, test the supply voltage circuit and the control circuit for an open/high resistance. If the circuits test normal, replace the seat cushion heating element.
3. Ignition OFF, disconnect the (C2, C5) harness connectors at the memory seat module.
4. Test for 3.0K-300K ohms of resistance between the seat cushion temperature sensor signal circuit terminal 1 (C5) and the low reference circuit terminal 3 (C2).
- If greater than 300K ohms, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion temperature sensor.
- If less than 3.0K ohms, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat cushion temperature sensor.
5. Ignition OFF, connect the (C1, C2, C5) harness connectors at the memory seat module.
6. Disconnect the harness connector at the seat cushion heating element/temperature sensor.
7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal C and ground.
- If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the memory seat module.
- If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the memory seat module.
8. If all circuits test normal, replace the memory seat module.

B2430 Passenger Seat Cushion
1. Ignition OFF, disconnect the (C1, C4) harness connectors at the memory seat module.
2. Test for less than 6.5 ohms of resistance between the seat cushion heater element supply voltage circuit terminal 6 (C1) and the control circuit terminal 14 (C4).
- If greater than 6.5 ohms, test the supply voltage circuit and the control circuit for an open/high resistance. If the circuits test normal, replace the seat cushion heating element.
3. Ignition OFF, disconnect the (C2, C5) harness connectors at the memory seat module.
4. Test for 3.0K-300K ohms of resistance between the seat cushion temperature sensor signal circuit terminal 2 (C5) and the low reference circuit terminal 6 (C2).
- If greater than 300K ohms, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion temperature sensor.
- If less than 3.0K ohms, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat cushion temperature sensor.
5. Ignition OFF, connect the (C1, C2, C4, C5) harness connectors at the memory seat module.
6. Disconnect the harness connector at the seat cushion heating element/temperature sensor.
7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor signal circuit terminal C and ground.
- If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the memory seat module.
- If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the memory seat module.
8. If all circuits test normal, replace the memory seat module.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Seat Cushion Heater Element Replacement - Front
- Control Module References for the memory seat module replacement, setup, and programming. Programming and Relearning
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