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 Descriptor
DTC B2345 00
- Seat Heater Disable Circuit

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 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 heated seat module is active, and none of the power diagnostic DTCs are current.

Conditions for Setting the DTC

After the heated seat is activated, the heated seat module detects a shorted circuit on the seat heating element supply voltage circuit or control circuit.

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 3 seconds after the reference voltage returns to normal operating range.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Circuit/System Testing

1. Ignition OFF, disconnect the C1 harness connector at the 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 heating 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 heating 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 heating 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 heating element control circuits for a short to voltage.

6. If all circuits test normal, replace the heated seat module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Seat Back Heater Element Replacement - Front (Impala) Seat Back Heater Element Replacement - Front (Monte Carlo)
* Seat Cushion Heater Element Replacement - Front (Impala) Seat Cushion Heater Element Replacement - Front (Monte Carlo)
* Programming and Relearning Programming and Relearning