The heating ventilation and air conditioning (HVAC) control module supplies a 12-volt reference voltage and a control circuit to the air conditioning compressor. The HVAC control module continuously monitors the control circuit for an open circuit or short to voltage or ground.

This DTC will set when the HVAC control module detects a short to ground or open/high resistance in the A/C compressor control circuit for 1 second or greater.

The A/C compressor is commanded OFF.

Schematic Reference

HVAC Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic HVAC Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the A/C compressor.
2. Ignition ON, test for 12 volts between the 12-volt reference circuit harness connector terminal 2 and ground.

⇒	If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.

3. Ignition OFF, test for less than 5 ohms between the low reference circuit harness connector terminal 1 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC control module.

4. If all circuits test normal, replace the HVAC control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.