B2345
DTC B2345
DTC Descriptor
DTC B2345 00
- Seat Heater Disable Circuit
DTC B2345 13
- Seat Heater Elements Temperature Above Threshold
DTC B2345 42
- Seat Heater Elements Current Sensing Calibration Not Programmed
DTC B2345 4B
- Seat Heater Elements Current Sensing Calibration Out of Range
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
Circuit/System Description
The rear heated seat heating elements are controlled by a common high current relay internal to the rear heated seat module and on the low side by individual element control circuits. Before the heated seat module 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 heated seat system is active.
Conditions for Setting the DTC
B2345 00
After the heated seat is activated, the heated seat module detects a shorted circuit on the seat heating element supply voltage circuit or control circuit.
B2345 13
Any temperature sensor input that remains below 1.5 volts for more than 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 rear passenger seats will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range 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 (C1) harness connector at the rear heated seat module.
2. Test for infinite resistance between the left seat heating element supply voltage circuit terminal 3 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 3 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 rear heated seat module.
B2345 13
1. Ignition OFF, disconnect the (C2, C4) harness connectors at the rear heated seat module.
2. Test for greater than 2.0K ohms of resistance between the following temperature sensor signal circuits and the low reference circuits:
* Left rear seat cushion terminal 6 (C2) and terminal 9 (C4)
* Left rear seat back terminal 5 (C2) and terminal 19 (C4)
* Right rear seat cushion terminal 8 (C2) and terminal 20 (C4)
* Right rear seat back terminal 7 (C2) and terminal 10 (C4)
• If less than 2.0K ohms, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate temperature sensor.
3. If all circuits test normal, replace the rear heated seat module.
B2345 42 or B2345 4B
If either DTC is set, the only option is module replacement.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Rear Seat Cushion Heater Replacement
* Seat Back Heater Replacement - Rear
* Programming and Relearning for the rear heated seat module setup, and programming. Programming and Relearning