For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1023 05: Integral Switch Performance Short to GroundDTC B1023 06: Integral Switch Performance Short to Battery or Open
DTC B1023 61: Integral Switch Performance Signal Invalid
Circuit/System Description
This DTC will be set by internal fault inside the HVAC control module for a stuck or shorted control button.
Conditions for Running the DTC
Battery voltage is between 9-16 volts and data link communications operate normally.
Conditions for Setting the DTC
The HVAC control module has internal fault inside the HVAC control module for a stuck or shorted control button.
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
| • | Air Delivery Description and OperationAir Temperature Description and Operation |
| • | Air Temperature Description and OperationAir Delivery Description and Operation |
Electrical Information Reference
| • | Circuit Testing |
| • | Wiring Repairs |
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Reprogram the HVAC control module. The module should successfully reprogram.
- With a scan tool, clear the DTC.
- Ignition OFF.
- Wait 60 seconds, then recheck for DTCs. DTC B1023 should not set.
| ⇒ | If the module will not reprogram, replace the HVAC control module that set the DTC. |
| ⇒ | If DTC B1023 sets, replace the module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module ReferencesControl Module References for control module replacement, setup, and programming
