Diagnostic Instructions

DTC Descriptors

DTC B2345 00: Seat Heater Disable Circuit

DTC B2345 4B: Seat Heater Disable Circuit Calibration Not Learned

DTC B2345 13: Seat Heater Disable Circuit Voltage Low/High Temperature

DTC B2345 42: Seat Heater Disable Circuit Calibration Data Set Not Programmed

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Driver Heated Seat Element Supply Voltage	B2508 02	B2425 0C, B2425 0D	B2508 01	--
Driver Heated Seat Element Control	B2508 02	B2425 0C, B2425 0D	B2508 01	--
Driver Heated Seat Temperature Sensor Signal	B1925 02	B1925 05, B2425 04, B2425 1F	B1925 05, B2425 04, B2425 1F	B2345 13, B2345 42, B2345 4B
Driver Heated Seat Temperature Sensor Low Reference	--	B1925 05, B2425 04, B2425 1F	--	B2345 13, B2345 42, B2345 4B
Passenger Heated Seat Element Supply Voltage	B2508 02	B2430 0C, B2430 0D	B2508 01	--
Passenger Heated Seat Element Control	B2508 02	B2430 0C, B2430 0D	B2508 01	--
Passenger Heated Seat Temperature Sensor Signal	B2170 02	B2170 05, B2430 04, B2430 1F	B2170 05, B2430 04, B2430 1F	B2345 13, B2345 42, B2345 4B
Passenger Heated Seat Temperature Sensor Low Reference	--	B2170 05, B2430 04, B2430 1F	--	B2345 13, B2345 42, B2345 4B

Circuit/System Description

The heated seat heating elements are controlled by a common high current relay internal to the heated seat module (HSM) and by individual low side element control circuits. The HSM connects the heater element supply voltage circuits for both seats to a common reference point. This reference point is biased to approximately 2 volts. Before the HSM will allow heated seat operation, it checks to see if the heating element supply voltage circuits and control circuits are shorted to ground or voltage. Once the HSM verifies that it is not closing into a shorted heating element, it allows heated seat operation. After which it continues to monitor for a shorted a circuit.

Conditions for Running the DTC

The HSM must be powered.

Conditions for Setting the DTC

B2345 00

After the heated seat is activated, the HSM detects a short on either the heating element supply voltage circuit or control circuit.

B2345 13

Any temperature sensor input that remains below 1.5 volts for more that 1 second.

B2345 42

This DTC will set if the module calibration is not programmed.

B2345 4B

This DTC will set if the module calibration is out of range.

Action Taken When the DTC Sets

The heated seat function for both seats will be disabled.

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Connector End View Reference

Power Seat Connector End Views

Electrical Information Reference

Scan Tool Reference

Circuit/System Testing

B2345 00

1. Ignition OFF, disconnect the C1 harness connector at the HSM.
2. Test for infinite resistance between the supply voltage circuit terminal 3 and ground.

⇒	If less than the specified range, test the supply voltage circuit and the control circuit for a short to ground.

3. Test for infinite resistance between the supply voltage circuit terminal 6 and ground.

⇒	If less than the specified range, test the supply voltage circuit and the control circuit for a short to ground.

4. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 3 and ground.

⇒	If the test lamp illuminates, test the supply voltage circuit and the control circuit for a short to voltage.

5. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 and ground.

⇒	If the test lamp illuminates, test the supply voltage circuit and the control circuit for a short to voltage.

6. If all circuits test normal, replace the HSM.

B2345 13

1. Ignition OFF, disconnect the X2, X4 harness connector at the HSM.
2. Test for greater than 1.9K ohms between the signal and low reference circuits listed below:

•	Driver seat cushion terminal 9 X4 and terminal 6 X2

•	Passenger seat cushion terminal 20 X4 and terminal 8 X2

⇒	If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate seat temperature sensor.

3. If all circuits test normal, replace the HSM.

B2345 42 or B2345 4B

If either DTC is set, replace the HSM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.