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| • | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Heated Seat Cushion Temperature Sensor Signal | B1925 02 | B1925 05 | B1925 05 | B2345 13 |
Passenger Heated Seat Cushion Temperature Sensor Signal | B2170 02 | B2170 05 | B2170 05 | B2345 13 |
Driver Heated Seat Element Control Terminal 3 X2 | B242A 02 | B2425 0D | B242A 01 | B2425 0B, B2425 0E |
Driver Heated Seat Element Control Terminal 1 X2 | B242A 02 | B2425 0D | B242A 01 | B2425 0B, B2425 0E |
Passenger Heated Seat Element Control Terminal 5 X2 | B242A 02 | B2430 0D | B242A 01 | B2430 0B, B2430 0E |
Passenger Heated Seat Element Control Terminal 2 X2 | B242A 02 | B2430 0D | B242A 01 | B2430 0B, B2430 0E |
Driver Heated Seat Cushion Temperature Sensor Low Reference | - | B1925 05 | - | B2345 13 |
Passenger Heated Seat Cushion Temperature Sensor Low Reference | - | B2170 05 | - | B2345 13 |
The driver and front passenger heated seats are controlled by the seat heating 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.
| • | DTC B1325 must not be present. |
| • | Engine must be running. |
| • | The seat heating control module must be powered and the heated seat must be enabled. |
By measuring current and voltage output to the seat heating elements every 10 s, the seat heating control module calculates that the heating element resistance is above the maximum resistance.
By measuring current and voltage output to the seat heating elements every 10 s, the seat heating control module calculates that the heating element resistance is below the minimum resistance.
The heated seat function for the affected seat will be disabled.
| • | The current DTC clears when the malfunction is no longer present, and the power mode changes to OFF then back to ACCESSORY or RUN. |
| • | The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred. |
Heated Seats Description and Operation
Control Module References for scan tool information
Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
| ⇒ | If not within the specified range, replace the E14A Seat Heating Element - Driver Back. |
Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
| ⇒ | If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14B Seat Heating Element - Driver Cushion. |
| ⇒ | If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14B Seat Heating Element - Driver Cushion. |
Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
| ⇒ | If not within the specified range, replace the E14C Seat Heating Element - Passenger Back. |
Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.
| ⇒ | If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14D Seat Heating Element - Passenger Cushion. |
| ⇒ | If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14D Seat Heating Element - Passenger Cushion. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for seat heating control module replacement, setup, and programming |
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