B2345
DTC B2345
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B2345 00
- Seat Heater Elements Short to Ground or Short to Battery
DTC B2345 4B
- Seat Heater Elements Current Sensing Calibration Out of Range
DTC B2345 13
- Seat Heater Elements Temperature Above Threshold
DTC B2345 42
- Seat Heater Elements Current Sensing Calibration Not Programmed
Diagnostic Fault Information
Circuit/System Description
The driver and passenger heated seat heating elements are controlled by a common high current relay internal to the memory seat module (MSM) and the low side by individual element control circuits. The MSM connects the heated seat heater element supply voltage circuits for both seats to a common reference point. This reference point is biased to approximately 2.0 volts. Before the memory seat module will allow heated seat operation, it checks to see if this reference voltage is shorted to ground or battery voltage. Once the module verifies that it is not closing to 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 (MSM) must be powered.
Conditions for Setting the DTC
B2345 00
After the heated seat is activated, the MSM 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 seats will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear and set the code to history 3 seconds after the reference voltage returns to the normal operating range and the ignition is cycled 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, C4) harness connectors at the MSM.
2. Test for infinite resistance between the driver seat heating element supply voltage circuit terminal 6 (C1) and ground.
• If less than the specified range, 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 6 (C1) 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 passenger seat heating element supply voltage circuit terminal 14 (C1) and ground.
• If less than the specified range, 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 14 (C1) 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 memory seat module.
B2345 13
1. Ignition OFF, disconnect the (C2, C4) harness connectors at the memory seat module.
2. Test for greater than 2.2K ohms of resistance between the following seat cushion temperature sensor signal circuits and the low reference circuits:
* Driver seat cushion terminal 1 (C5) and terminal 3 (C2)
* Passenger seat cushion terminal 2 (C5) and terminal 6 (C2)
• If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate temperature sensor.
3. Test for greater than 3.2K ohms of resistance between the following seat back temperature sensor signal circuits and the low reference circuits:
* Driver seat back terminal 4 (C5) and terminal 2 (C2)
* Passenger seat back terminal 3 (C5) and terminal 6 (C2)
• If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate temperature sensor.
4. If all circuits test normal, replace the memory 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
* Driver Seat Back Cushion Heater and Passenger Seat Back Cushion Heater Replacement
* Driver Seat Cushion Heater and Passenger Seat Cushion Heater Replacement (Passenger Seat) Driver Seat Cushion Heater and Passenger Seat Cushion Heater Replacement (Driver Seat)
* Control Module References for the memory seat module replacement, setup, and programming. Programming and Relearning