B2345 (Front Seat)

DTC B2345 (FRONT SEAT)

DTC DESCRIPTOR

DTC B2345 00
Seat Heater Disable Circuit

DTC B2345 13
Seat Heater Disable Circuit High Temperature

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

DTC B2345 4B
Seat Heater Disable Circuit Calibration Not Learned

DIAGNOSTIC FAULT INFORMATION




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

CIRCUIT/SYSTEM DESCRIPTION
The front seat heating elements are controlled by a common high current relay internal to the Memory Seat Module (MSM) and on the low side by individual element control circuits. Before the MSM will allow heated seat operation, it checks to see if the heating element supply voltage circuits and control circuits are shorted to ground or battery voltage. Once the module 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 circuit.

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

CONDITIONS FOR SETTING THE DTC

B2345 00
After a heated seat is activated, the MSM detects a shorted circuit on the seat heating element supply voltage circuit or control circuit.

B2345 13
Any of the temperature sensor inputs remains below 1.5 volts for a seat back or 0.95 volts for a seat cushion more than 1 second.

B2345 42
The current sensing calibration data is out of range.

B2345 4B
The current sensing calibration data is not programmed.

ACTION TAKEN WHEN THE DTC SETS
The heated seat functions for both front seats 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 50 consecutive fault-free ignition cycles have occurred.

CIRCUIT/SYSTEM TESTING
B2345 00
1. Ignition OFF, disconnect the MSM connectors C1 and C4.
2. Test for infinite resistance between the left seat heating element supply voltage circuit terminal 14 and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
3. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 and ground.
- If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
4. Test for infinite resistance between the right seat heating element supply voltage circuit terminal 6 and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
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 seat cushion and seat back heating element control circuits for a short to voltage.
6. If all circuits test normal, replace the MSM.

B2345 13
1. Disconnect the MSM connectors C2 and C5.
2. Verify the resistance through the faulted seat heat sensor is 850-300K ohms from the signal circuit terminal to the low reference circuit terminal in the harness connectors.
- If less than 850 ohms, replace the seat heater element.
3. If the circuits test normal replace the MSM.

B2345 42 or B2345 4B
If this DTC is retrieved as a current DTC, replace the MSM.

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