DTC B2425 or B2430 (With Memory A45)
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DTC B2425 or B2430 (With Memory A45)
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DTC B2425 0B
Driver Seat Cushion Heater Circuit High Current
DTC B2425 0D
Driver Seat Cushion Heater Circuit High Resistance
DTC B2425 0E
Driver Seat Cushion Heater Circuit Low Resistance
DTC B2430 0B
Passenger Seat Cushion Heater Circuit High Current
DTC B2430 0D
Passenger Seat Cushion Heater Circuit High Resistance
DTC B2430 0E
Passenger Seat Cushion Heater Circuit Low Resistance
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Seat Memory Control Module B+ Terminal 5 X4
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B242A 02, B2425 0D, B2430 0D, 1, 2
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B242A 02, B2425 0D, B2430 0D, 1, 2
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-
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-
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Driver Heated Seat Element Control Terminal 11 X3
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B242A 02
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B2425 0D
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B242A 01
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B2425 0B, B2425 0E
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Driver Heated Seat Element Control Terminal 6 X3
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B242A 02
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B2425 0D
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B242A 01
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B2425 0B, B2425 0E
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Driver Heated Seat Temperature Sensor Signal
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B1925 02
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B1925 05
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B1925 05
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B2345 13
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Driver Heated Seat Temperature Sensor Low Reference
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-
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B1925 05
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-
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B2345 13
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Passenger Heated Seat Element Control Terminal 10 X3
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B242A 02
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B2430 0D
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B242A 01
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B2430 0B, B2430 0E
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Passenger Heated Seat Element Control Terminal 4 X3
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B242A 02
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B2430 0D
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B242A 01
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B2430 0B, B2430 0E
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Passenger Heated Seat Temperature Sensor Signal
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B2170 02
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B2170 05
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B2170 05
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B2345 13
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Passenger Heated Seat Temperature Sensor Low Reference
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-
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B2170 05
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-
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B2345 13
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1. Power seats inoperative
2. Heated seats inoperative
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Circuit/System Description
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The driver and front passenger heated seats are controlled by the seat memory control module that is located under the driver seat cushion. When the heated seat is active, the module applies power through a common voltage supply circuit to the seat heater elements. The module controls the seat temperature by providing a pulse width modulation (PWM) ground through the seat heater element control circuit to the heater elements. The module then monitors the current flow through the heating elements and the rate of change of the temperature sensor to verify correct heated seat operation.
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Conditions for Running the DTC
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DTC B1325 must not be present.
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•
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The engine must be running.
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The seat memory control module must be powered and the heated seat must be enabled.
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Conditions for Setting the DTC
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B2425 0D or B2430 0D
By measuring current and voltage output to the seat heating elements every 10 seconds, the seat memory control module calculates that the heating element resistance is above the maximum resistance.
B2425 0B, B2425 0E, B2430 0B, or B2430 0E
By measuring current and voltage output to the seat heating elements every 10 seconds, the seat memory control module calculates that the heating element resistance is below the minimum resistance.
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Action Taken When the DTC Sets
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The heated seat function for the affected seat will be disabled.
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Conditions for Clearing the DTC
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The current DTC clears when the malfunction is no longer present, and the power mode changes to OFF then back to ACC or RUN.
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•
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The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.
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Schematic Reference
Heated/Cooled Seat Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Heated/Vented Seat Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
B2425 0B, B2425 0D, or B2425 0E
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1.
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Ignition OFF, disconnect the X4 harness connector at the K40 seat memory control module.
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2.
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Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
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3.
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If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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4.
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Ignition OFF, connect the X4 harness connector at the K40 seat memory control module and disconnect the harness connector at the E14A seat back heating element.
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5.
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Note
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Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
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Test for 0.5 - 5 Ω between terminal A and terminal B.
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6.
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If not within the specified range, replace the E14A seat back heating element.
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7.
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Connect the harness connector at the E14A seat back heating element and disconnect the X3 harness connector at the K40 seat memory control module.
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8.
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Note
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Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
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Test for 1 - 7 Ω between control circuit terminals 11 and 6.
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9.
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If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14B seat cushion heating element.
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10.
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If greater than the specified range, test the control circuits for an open circuit/high resistance. If the circuits test normal, replace the E14B seat cushion heating element.
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11.
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If all circuits test normal, replace the K40 seat memory control module.
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B2430 0B, B2430 0D, or B2430 0E
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1.
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Ignition OFF, disconnect the X4 harness connector at the K40 seat memory control module.
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2.
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Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
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3.
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If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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4.
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Ignition OFF, connect the X4 harness connector at the K40 seat memory control module and disconnect the harness connector at the E14C seat back heating element.
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5.
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Note
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Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
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Test for 0.5 - 5 Ω between terminal A and terminal B.
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6.
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If not within the specified range, replace the E14C seat back heating element.
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7.
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Connect the harness connector at the E14C seat back heating element and disconnect the X3 harness connector at the K40 seat memory control module.
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8.
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Note
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Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
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Test for 1 - 7 Ω between control circuit terminals 10 and 4.
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9.
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If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14D seat cushion heating element.
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10.
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If greater than the specified range, test the control circuits for an open circuit/high resistance. If the circuits test normal, replace the E14D seat cushion heating element.
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11.
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If all circuits test normal, replace the K40 seat memory control module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
