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DTC B096A

DTC B096A

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 B096A 02

Hazard Lamps Switch Backlight Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Interior Backlighting Control B096A 02 2 1 -
1. Hazard Backlighting at Full Intensity and Cannot be Dimmed 2. Hazard Backlighting do Not Illuminate


Circuit/System Description

The body control module (BCM) supplies a voltage reference through the instrument panel cluster dimming voltage reference circuit to the instrument panel cluster lamps dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the cluster lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage to the LED dimming supply circuit to all related interior lamps, illuminating them to the desired level of brightness.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

B096A 02

The BCM detects a short to ground on the LED backlight lamp control circuit.

Action Taken When the DTC Sets

The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp control circuits.

Conditions for Clearing the DTC


• The condition responsible for setting the DTC no longer exists.

• A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.


Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Interior Lighting Systems 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 Verification

Ignition ON, vary the interior backlighting from dim to full bright by using the dimmer switch. The interior backlighting should dim and then become full bright.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the S26 Hazard Lamps Switch.

2. Test for less than 5 Ω between the ground circuit terminal 1 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Connect a test lamp between the backlight control circuit of the S26 Hazard Lamps Switch terminal 5 and ground.

5. Ignition ON, vary the interior lamp dimming switch from dim to full bright. The test lamp should dim and then become full bright.

6. If the test lamp cannot be dimmed, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.

7. If the test lamp is always OFF, test the control circuit for open/high resistance or short to ground. If the circuit tests normal, replace the K9 body control module.

8. If all circuits test normal, replace the S26 Hazard Lamps Switch.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Radio Control Assembly Replacement

• Control Module References for BCM replacement, setup, and programming