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DTC B3596

DTC B3596

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.


DTC Descriptor

DTC B3596 00

Hazard Lamps Request Circuit Malfunction

Diagnostic Fault Information

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

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B3596 00



Circuit/System Description

The hazard flashers may be activated in any power mode. The hazard warning switch is permanently grounded. When the hazard warning switch is placed in the ON position, ground is applied through the hazard warning 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.

Conditions for Running the DTC

Hazard warning switch activated.

Conditions for Setting the DTC

Hazard warning switch stuck.

Action Taken When the DTC Sets

Hazard flashers malfunction.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

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 Verification

Ignition ON, observe the scan tool Hazard Lamps Switch parameter, that when the S26 Hazard Lamps Switch is pressed and released the scan tool parameter toggle between Active and Inactive.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.

2. Test for less than 5 Ω between the S48D Multifunction Switch 2 - Instrument Panel harness connector ground circuit terminal 1 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the S48D Multifunction Switch 2 - Instrument Panel.

4. Connect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.

5. Disconnect the X2 harness connector at the K9 Body Control Module.

6. Test for less than 0.3 V at the K9 Body Control Module signal circuit harness terminal 26 X2 and ground.

7. If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the S48D Multifunction Switch 2 - Instrument Panel.

8. Test for infinite resistance between the K9 Body Control Module signal circuit harness terminal 26 X2 and ground.

9. If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the S48D Multifunction Switch 2 - Instrument Panel.

10. Press and hold the S48D Multifunction Switch 2 - Instrument Panel, test for less than 5 Ω of resistance between the K9 Body Control Module signal circuit harness terminal 26 X2 and ground.

11. If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the S48D Multifunction Switch 2 - Instrument Panel.

12. If all circuits test normal, replace the K9 Body Control Module.


Component Testing


Static Test

1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.

2. Test for infinite resistance between the S48D Multifunction Switch 2 - Instrument Panel terminal 4 and terminal 1.

3. If less than the specified value, replace the S48D Multifunction Switch 2 - Instrument Panel.

4. Press and hold the S48D Multifunction Switch 2 - Instrument Panel, test for less than 5 Ω of resistance between the S48D Multifunction Switch 2 - Instrument Panel terminal 4 and terminal 1.

5. If not within the specified range, replace the S48D Multifunction Switch 2 - Instrument Panel.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Hazard Warning Switch Replacement

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