B013B

DTC B013B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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 (HVAC - Automatic)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Automatic HVAC Description and Operation (HVAC - Automatic)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) 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.

• 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.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

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