Factory Installed
DTC B2345 (Factory Installed)
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 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
Circuit/System Description
The driver and front passenger 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 MSM 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 MSM 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
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 functions for both 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 (Connector Views)
Description and Operation
Heated Seats Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
B2345 00
1. Ignition OFF, disconnect the X1, X4 harness connectors at the MSM.
2. Test for infinite resistance between the control circuit terminal 14 X1 and ground.
• If not the specified value, test the control circuits listed below for a short to ground:
* Driver seat cushion and seat back terminal 14 X1
* Driver seat cushion element terminal 11 X1
* Driver seat back element terminal 1 X1
3. Test for infinite resistance between the control circuit terminal 6 X1 and ground.
• If not the specified value, test the control circuits listed below for a short to ground:
* Passenger seat cushion and seat back terminal 6 X1
* Passenger seat cushion element terminal 14 X4
* Passenger seat back element terminal 4 X1
4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 14 X1 and ground.
• If the test lamp illuminates, test the control circuits listed below for a short to voltage:
* Driver seat cushion and seat back terminal 14 X1
* Driver seat cushion element terminal 11 X1
* Driver seat back element terminal 1 X1
5. Verify that a test lamp does not illuminate between the control circuit terminal 6 X1 and ground.
• If the test lamp illuminates, test the control circuits listed below for a short to voltage:
* Passenger seat cushion and seat back terminal 6 X1
* Passenger seat cushion element terminal 14 X4
* Passenger seat back element terminal 4 X1
6. If all circuits test normal, replace the MSM.
B2345 13
1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
2. Test for greater than 850 ohms between the signal circuit and the low reference circuits listed below:
* 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 seat cushion heater element/temperature sensor.
3. Test for greater than 850 ohms between the signal and the low reference circuits listed below:
* Driver seat back terminal 4 X5 and terminal 2 X2
* Passenger seat back terminal 3 X5 and terminal 5 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 seat back heater element/temperature sensor.
4. If all circuits test normal, replace the MSM.
B2345 42 or B2345 4B
If either DTC is set, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Driver or Passenger Seat Back Cushion Heater Replacement (Driver or Passenger Seat Back Cushion Heater Replacement)
* Driver or Passenger Seat Cushion Heater Replacement (Driver or Passenger Seat Cushion Heater Replacement)
* Control Module References (Programming and Relearning) for the MSM replacement, setup, and programming