B1395

DTC B1395

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1395 03
- Control Module Voltage Reference Output Circuit Low Voltage

DTC B1395 07
- Control Module Voltage Reference Output Circuit High Voltage

Circuit/System Description

The HVAC control module monitors the supply voltage to ensure that the voltage stays within the proper range. Damage to components or incorrect operation can occur if the voltage is out of range.

Conditions for Running the DTC

* Ignition ON.

* The HVAC control module is ON.

Conditions for Setting the DTC

The HVAC control module detects a low or high voltage on the supply voltage circuit.

Action Taken When the DTC Sets

The HVAC control module is inoperative.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information

Schematic Reference

HVAC Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Manual HVAC Description and Operation HVAC - Manual

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC control module, engine running.

2. Test for 11-14.2 V between the B+ circuit terminal 1 and ground.

• If less than 11 V and the circuit fuse is good

1. Ignition OFF.

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.

• If less than 11 V and the circuit fuse is open

1. Ignition OFF.

2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K33 HVAC control module.

• If greater than 14.2 V
Refer to Charging System Test Testing and Inspection.

• If between 11-14.2 V

3. Replace the K33 HVAC control module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for HVAC control module replacement, programming, and setup