Diagnostic Instructions
DTC Descriptor
DTC B1023 05: Integral Switch Performance Short to Ground
DTC B1023 06: Integral Switch Performance Short to Battery or Open
DTC B1023 61: Integral Switch Performance Signal Invalid
Circuit/System Description
This DTC may be set by an open or shorted 5 volt reference circuit to the auxiliary HVAC control module or an 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 or shorted 5 volt reference circuit.
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
HVAC Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, disconnect the harness connector at the auxiliary HVAC control module, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC Control Module. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the HVAC Control Module. |
- Reprogram the HVAC control module that set DTC B1023. The module should successfully reprogram.
| ⇒ | If the module will not reprogram, replace the HVAC control module that set the DTC. |
- With a scan tool, clear the DTC.
- Ignition OFF.
- Wait 60 seconds, then recheck for DTCs. DTC B1023 should not set.
| ⇒ | 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
