B3596

DTC B3596

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC B3596 00
- Hazard Lamps Request Circuit Malfunction

Diagnostic Fault Information





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

Ignition is ON

Conditions for Setting the DTC

Hazard warning switch stuck for more than 1 min

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 (Exterior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Hazard Lamps Switch parameter, that when the S48C Multifunction Switch 1 - Instrument Panel 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 S48C Multifunction Switch 1 - Instrument Panel.
2. Test for less than 5 ohm between the S48C Multifunction Switch 1 - Instrument Panel harness connector ground circuit terminal 7 and ground.

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

3. Connect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel.
4. Disconnect the X2 harness connector at the K9 Body Control Module.
5. Ignition ON, test for less than 0.3 V at the K9 Body Control Module signal circuit harness terminal 26 (X2) and ground.

• If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the S48C Multifunction Switch 1 - Instrument Panel.

6. Ignition OFF, test for infinite resistance between the K9 Body Control Module signal circuit harness terminal 26 (X2) and ground.

• If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the S48C Multifunction Switch 1 - Instrument Panel.

7. Press and hold the S26 Hazard Lamps Switch, test for less than 5 ohm of resistance between the K9 Body Control Module signal circuit harness terminal 26 (X2) and ground.

• If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the S48C Multifunction Switch 1 - Instrument Panel.

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

Component Testing

Static Test
1. Ignition OFF, disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel.
2. Test for infinite resistance between the S48C Multifunction Switch 1 - Instrument Panel terminal 10 and terminal 7.

• If less than the specified value, replace the S48C Multifunction Switch 1 - Instrument Panel.

3. Press and hold the S48C Multifunction Switch 1 - Instrument Panel, test for less than 5 ohm of resistance between the S48C Multifunction Switch 1 - Instrument Panel terminal 10 and terminal 7.

• If not within the specified range, replace the S48C Multifunction Switch 1 - Instrument Panel.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Instrument Panel Multifunction Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming.