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 Disable Circuit
DTC B2345 4B
- Seat Heater Disable Circuit Calibration Not Learned
DTC B2345 13
- Seat Heater Disable Circuit Voltage Low/High Temperature
DTC B2345 42
- Seat Heater Disable Circuit Calibration Data Set Not Programmed
Diagnostic Fault Information
Circuit/System Description
The heated seat heating elements are controlled by a common high current relay internal to the heated seat module and by individual low side element control circuits. The heated 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 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 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 heated seat module must be powered.
Conditions for Setting the DTC
B2345 00
After the heated seat is activated, the heated seat module detects a short on either the heating element supply voltage circuit or control circuit.
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 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 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.
Circuit/System Testing
B2345 00
1. Ignition OFF, disconnect the X1 harness connector at the heated seat module.
2. Test for infinite resistance between the control circuit terminal 3 and ground.
^ If not the specified value, test the control circuit for a short to ground.
3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 3 and ground.
^ If the test lamp illuminates, test the control circuit for a short to voltage.
4. Test for infinite resistance between the control circuit terminal 6 and ground.
^ If not the specified value, test the control circuit for a short to ground.
5. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 6 and ground.
^ If the test lamp illuminates, test the control circuit for a short to voltage.
6. If all circuits test normal, replace the heated seat module.
B2345 13
1. Ignition OFF, disconnect the X2, X4 harness connectors at the heated seat module.
2. Test for greater than 1.9K ohms between the signal circuits and low reference circuits listed below:
* Driver seat cushion terminal 9 X4 and terminal 6 X2
* Passenger seat cushion terminal 20 X4 and terminal 8 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 heated seat module.
B2345 42 or B2345 4B
If either DTC is set, replace the heated seat module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Driver Seat and Passenger Seat Back Cushion Heater Replacement (Impala)
* Driver Seat and Passenger Seat Cushion Heater Replacement (Impala).