DTC B2425 or B2430 With Memory - A45
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B2425 0B: Left Seat Cushion Heater Circuit High CurrentDTC B2425 0D: Left Seat Cushion Heater Circuit High Resistance
DTC B2425 0E: Left Seat Cushion Heater Circuit Low Resistance
DTC B2430 0B: Right Seat Cushion Heater Circuit High Current
DTC B2430 0D: Right Seat Cushion Heater Circuit High Resistance
DTC B2430 0E: Right Seat Cushion Heater Circuit Low Resistance
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Memory Seat Module B+ Terminal 5 | B2425 0D, B2430 0D, 1, 2 | B2425 0D, B2430 0D, 1, 2 | -- | -- |
Driver Heated Seat Element Control Terminal 11 X3 | B242A 02 | B2425 0D | B242A 01 | B2425 0E |
Driver Heated Seat Element Control Terminal 6 X3 | B242A 02 | B2425 0D | B242A 01 | B2425 0E |
Driver Heated Seat Temperature Sensor Signal | B1925 02 | B1925 05 | B1925 05 | -- |
Driver Heated Seat Temperature Sensor Low Reference | -- | B1925 05 | -- | -- |
Passenger Heated Seat Element Control Terminal 10 X3 | B242A 02 | B2430 0D | B242A 01 | B2430 0E |
Passenger Heated Seat Element Control Terminal 4 X3 | B242A 02 | B2430 0D | B242A 01 | B2430 0E |
Passenger Heated Seat Temperature Sensor Signal | B2170 02 | B2170 05 | B2170 05 | -- |
Passenger Heated Seat Temperature Sensor Low Reference | -- | B2170 05 | -- | -- |
1. Power seats inoperative 2. Heated seats inoperative | ||||
Circuit/System Description
The driver and front passenger heated seats are controlled by the memory seat 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.
Conditions for Running the DTC
| • | DTC B1325 must not be present. |
| • | The memory seat module must be powered and the heated seat must be enabled. |
Conditions for Setting the DTC
B2425 0D or B2430 0D
By measuring current and voltage output to the seat heating elements every 10 seconds, the memory seat 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 memory seat module calculates that the heating element resistance is below the minimum resistance.
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 40 consecutive fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Heated/Vented Seat Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
B2425 0B, B2425 0D, or B2425 0E
- Ignition OFF, disconnect the X4 harness connector at the K40 memory seat module.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
- Ignition OFF, connect the X4 harness connector at the K40 memory seat module and disconnect the harness connector at the E14A seat back heating element.
- Test for 1.7 - 7.0 Ω between terminal 1 and terminal 2.
- Connect the harness connector at the E14A seat back heating element and disconnect the X3 harness connector at the K40 memory seat module.
- Test for 1.7 - 7.0 Ω between control circuit terminal 11 and control circuit terminal 6.
- If all circuits test normal, replace the K40 memory seat module.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If not within the specified range, replace the E14A seat back heating element. |
| ⇒ | 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. |
| ⇒ | If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14B seat cushion heating element. |
B2430 0B, B2430 0D, or B2430 0E
- Ignition OFF, disconnect the X4 harness connector at the K40 memory seat module.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
- Ignition OFF, connect the X4 harness connector at the K40 memory seat module and disconnect the harness connector at the E14C seat back heating element.
- Test for 1.7 - 7.0 Ω between terminal 1 and terminal 2.
- Connect the harness connector at the E14C seat back heating element and disconnect the X3 harness connector at the K40 memory seat module.
- Test for 1.7 - 7.0 Ω between control circuit terminal 10 and control circuit terminal 4.
- If all circuits test normal, replace the K40 memory seat module.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If not within the specified range, replace the E14C seat back heating element. |
| ⇒ | 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. |
| ⇒ | If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14D seat cushion heating element. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for memory seat module replacement, setup, and programming |
DTC B2425 or B2430 Without Memory - A45
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B2425 0B: Left Seat Cushion Heater Circuit High CurrentDTC B2425 0D: Left Seat Cushion Heater Circuit High Resistance
DTC B2425 0E: Left Seat Cushion Heater Circuit Low Resistance
DTC B2430 0B: Right Seat Cushion Heater Circuit High Current
DTC B2430 0D: Right Seat Cushion Heater Circuit High Resistance
DTC B2430 0E: Right Seat Cushion Heater Circuit Low Resistance
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Heated Seat Element Control Terminal 3 X2 | B242A 02 | B2425 0D | B242A 01 | B2425 0E |
Driver Heated Seat Element Control Terminal 1 X2 | B242A 02 | B2425 0D | B242A 01 | B2425 0E |
Driver Heated Seat Temperature Sensor Signal | B1925 02 | B1925 05 | B1925 05 | -- |
Driver Heated Seat Temperature Sensor Low Reference | -- | B1925 05 | -- | -- |
Passenger Heated Seat Element Control Terminal 5 X2 | B242A 02 | B2430 0D | B242A 01 | B2430 0E |
Passenger Heated Seat Element Control Terminal 2 X2 | B242A 02 | B2430 0D | B242A 01 | B2430 0E |
Passenger Heated Seat Temperature Sensor Signal | B2170 02 | B2170 05 | B2170 05 | -- |
Passenger Heated Seat Temperature Sensor Low Reference | -- | B2170 05 | -- | -- |
Circuit/System Description
The driver and front passenger heated seats are controlled by the heated seat 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.
Conditions for Running the DTC
| • | DTC B1325 must not be present. |
| • | The heated seat module must be powered and the heated seat must be enabled. |
Conditions for Setting the DTC
B2425 0D or B2430 0D
By measuring current and voltage output to the seat heating elements every 10 seconds, the heated seat 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 heated seat module calculates that the heating element resistance is below the minimum resistance.
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 40 consecutive fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Heated/Vented Seat Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
B2425 0B, B2425 0D, or B2425 0E
- Ignition OFF, disconnect the harness connector at the E14A seat back heating element.
- Test for 1.7 - 7.0 Ω between terminal 1 and terminal 2.
- Connect the harness connector at the E14A seat back heating element and disconnect the X2 harness connector at the K29 heated seat module.
- Test for 1.7 - 7.0 Ω between control circuit terminal 3 and control circuit terminal 1.
- If all circuits test normal, replace the K29 heated seat module.
| ⇒ | If not within the specified range, replace the E14A seat back heating element. |
| ⇒ | 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. |
| ⇒ | If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14B seat cushion heating element. |
B2430 0B, B2430 0D, or B2430 0E
- Ignition OFF, disconnect the harness connector at the E14C seat back heating element.
- Test for 1.7 - 7.0 Ω between terminal 1 and terminal 2.
- Connect the harness connector at the E14C seat back heating element and disconnect the X2 harness connector at the K29 heated seat module.
- Test for 1.7 - 7.0 Ω between control circuit terminal 5 and control circuit terminal 2.
- If all circuits test normal, replace the K29 heated seat module.
| ⇒ | If not within the specified range, replace the E14C seat back heating element. |
| ⇒ | 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. |
| ⇒ | If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14D seat cushion heating element. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for heated seat module replacement, setup, and programming |
