B2345 (Rear Seat)
DTC B2345 (Rear Seat)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
DTC Descriptors
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
Circuit/System Description
The rear seat cushion 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 memory seat module must be powered.
Conditions for Setting the DTC
B2345 00
After a heated seat is activated, the rear heated seat module 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 1.45 volts for 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 function for both rear passenger 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.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Component Connector End Views)
Description and Operation
Heated Seats Description and Operation (KA1) (Heated Seats Description and Operation (KA1))Heated Seats Description and Operation (KA6) (Heated Seats Description and Operation (KA6))
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
Programming and Relearning (Programming and Relearning)for Scan Tool Information
Circuit/System Testing
B2345 00
1. Ignition OFF, disconnect the X1 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 element control circuit 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 element control circuit 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 element control circuit 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 element control circuit for a short to voltage.
6. If all circuits test normal, replace the rear heated seat module.
B2345 13
1. Disconnect the rear heated seat module connectors X2 and X4.
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 rear heated seat module.
B2345 42 or B2345 4B
If this DTC is retrieved as a current DTC, replace the rear heated seat module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Rear Seat Cushion Heater Replacement (Rear Seat Cushion Heater Replacement)
* Programming and Relearning (Programming and Relearning)for the rear heated seat module replacement, setup, and programming