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Hazard Lamps Malfunction

Hazard Lamps Malfunction

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.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Hazard Switch Signal B3596 00 1 1 -
1. Hazard Function Inoperative


Circuit/System Description

When the hazard switch is placed in the ON position, ground is momentarily applied through the hazard switch signal circuit to the body control module (BCM). The BCM will detect this voltage drop and will supply battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard switch is activated, the BCM sends a serial data message to the instrument panel cluster (IPC) requesting both turn signal indicators to be cycled ON and OFF.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior 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

Observe the function of the right and left turn signal lamps while turning the hazard lamp switch ON and OFF. The right and left turn signal lamps should cycle ON and OFF while the hazard lamp switch is ON and remain OFF when the hazard lamp switch is OFF.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the P17 info display module.

2. Ignition ON, test for greater than 10V between the signal circuit terminal 16 and ground.

3. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

4. If all circuits test normal, replace the P17 info display module.


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