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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 has overviews of all diagnostic categories.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Hazard Switch Signal

2

1

1

-

Hazard Switch Indicator Signal

3

3

4

-

Hazard Switch Ground

-

1, 2

-

-

1. Hazard Lamps Inoperative

2. Hazard Lamps Always ON

3. Hazard Switch Indicator Inoperative

4. Hazard Switch Always ON



Circuit/System Description

The hazard flashers may be activated in any power mode. The hazard warning switch is permanently grounded. When the hazard switch is placed in the ON position, ground is applied through the hazard switch signal circuit to the body control module (BCM). The BCM supplies battery voltage to all 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 cluster 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 information on diagnostic tools

Circuit/System Testing


Hazard Lamps Malfunction

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

2. Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal 1.

3. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.

4. Ignition ON, verify the scan tool Hazard Lamp Switch parameter is INACTIVE.

5. If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Hazard Lamp Switch parameter is ACTIVE.

7. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

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



Hazard Switch Indicator Malfunction

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

2. Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal 1.

3. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.

4. Ignition ON, test for greater than 11 V between the circuit terminal 5 and the ground.

5. If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

6. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 4 and ground.

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


Hazard Lamp Indicators Malfunction

Ignition ON, command the All Indicators test ON and OFF with the scan tool, verify both turn signal indicators changes between turn ON and OFF.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Hazard Warning Switch Replacement

• Control Module References for BCM or instrument cluster replacement, setup, and programming