GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2009 🢒 G8 🢒 HVAC 🢒 HVAC - Automatic 🢒 DTC B013B

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 B013B: Air Conditioning Compressor Displacement Control Circuit

Circuit/System Description

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.

Conditions for Running the DTC
    • Ignition ON.
    • Ignition voltage is between 9-16 volts.
    • The HVAC module is ON.

Conditions for Setting the DTC

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.

Action Taken When the DTC Sets

The A/C compressor is commanded OFF.

Conditions for Clearing the DTC
    • The DTC becomes history when the HVAC control module no longer detects the condition that set the DTC.
    • The history DTC will clear after 100 fault free ignition cycles.
    •  The DTC can be cleared using a scan tool.

Reference Information

Schematic Reference

HVAC Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic HVAC Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing
  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.
    3. ⇒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.
    4. ⇒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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Recirculation Actuator Replacement
    •  Mode Actuator Replacement
    •  Temperature Valve Actuator Replacement - Left Side
    •  Temperature Valve Actuator Replacement - Right Side
    •  Control Module References for HVAC control module and HVAC auxiliary control module or rear seat audio (RSA) replacement, setup, and programming