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 01
- Hazard Lamps Request Circuit Short to Battery

Circuit/System Description

The Vehicle Interface Unit (VIU) controls the flasher module output ON command feature through a serial data message to the Body Control Module (BCM).

Conditions for Running the DTC

When the flasher ON command output is actively being requested by the VIU.

Conditions for Setting the DTC

This DTC is set if the VIM attempts to assert its flasher module control output to the low voltage state, but senses that the output remains in the high voltage state.

Action Taken When the DTC Sets

The VIU disables the flasher output to the BCM until the next ignition cycle.

Conditions for Clearing the DTC

* The current DTC will become history when the request for the output is removed.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Reference Information
Schematic Reference

Horn Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Horns System Description and Operation (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

Command the flasher control output ON and OFF with the scan tool. The flashers should turn ON and OFF when changing between the commanded states. Refer to Symptoms - Lighting Systems (Symptoms - Lighting Systems)

Repair Instructions

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

Control Module References (Programming and Relearning)for VIU replacement, setup and programming