For 1990-2009 cars

### 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 Descriptors

DTC B1395 02: Device Voltage Reference Output Circuit Short to Ground
DTC B1395 05: Device Voltage Reference Output Circuit Short to Battery or Open

### Description

This diagnostic applies to internal microprocessor integrity conditions within the HSM (HSM).

### Conditions for Running the DTC

The HSM must be powered.

### Conditions for Setting the DTC

The voltage sensing calibration data is out of range.

### Action Taken When the DTC Sets

The heated seat function for both front seats will be disabled.

### Conditions for Clearing the DTC

• | The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to RUN or ACC.

• | The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

### Reference Information

#### Schematic Reference

Heated/Cooled Seat Schematics

#### Connector End View Reference

Heated/Cooled Seat Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

• | Scan Tool Data List

• | Scan Tool Data Definitions

### Circuit/System Verification

If either DTC is set history or current, replace the HSM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for HSM replacement, programming and setup