B2345
DTC B2345
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2345 4B
- Front Seat Heater Current Sensing Calibration Out of Range
DTC B2345 13
- Front Seat Heater Temperature Above Threshold
DTC B2345 42
- Front Seat Heater Current Sensing Calibration Not Present
Diagnostic Fault Information
Circuit/System Description
The heated seat heating elements are controlled by a common high current relay internal to the memory seat module and by individual low side element control circuits. The memory seat module 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 memory 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 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 a circuit.
Conditions for Running the DTC
The memory seat module must be powered.
Conditions for Setting the DTC
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 present.
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 passenger 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 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.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Heated/Vented Seat Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for Scan Tool Information
Circuit/System Testing
B2345 13
1. Ignition OFF, disconnect the X2, X5 harness connector at the memory seat module.
2. Test for greater than 1.9K ohms between the following temperature sensor signal and low reference circuits.
* Driver seat cushion terminal 1 X5 and terminal 3 X2
* Passenger seat cushion terminal 2 X5 and terminal 6 X2.
• 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. If all circuits test normal, replace the memory seat module.
B2345 42 or B2345 4B
If either DTC is set current or history, the only option is module replacement.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Driver Seat and Passenger Seat Back Cushion Heater Replacement (Driver Seat and Passenger Seat Back Cushion Heater Replacement)
* Driver Seat and Passenger Seat Cushion Heater Replacement (Driver Seat and Passenger Seat Cushion Heater Replacement)
* Control Module References (Programming and Relearning) for the memory seat module replacement, setup, and programming