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. |
DTC Descriptor
DTC B3596 01: Hazard Lamps Request Circuit Short to BatteryCircuit/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
Connector End View Reference
Description and Operation
Horns System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for VIU replacement, setup and programming
