Buick Regal: 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 provides an overview of each
diagnostic category.
DTC Descriptor
DTC B3596 00
Hazard Lamps Request Circuit Malfunction
Diagnostic Fault Information
1. Hazard Lamps Malfunction
2. Hazard Warning Switch Backlighting Malfunction
Circuit/System Description
The hazard flashers may be activated in any power mode. The hazard warning
switch signal circuit is
momentarily grounded when the hazard warning switch is pressed. The body control
module (BCM)
responds to the hazard warning switch signal input by supplying battery voltage
to all four turn signal
lamps in an ON and OFF duty cycle. When the hazard warning 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.
Conditions for Running the DTC
- Battery voltage must be between 9-16 V.
- Hazard lamps ON.
Conditions for Setting the DTC
The hazard warning switch input is Active for longer than 60 s.
Actions Taken When the DTC Sets
The hazard lamps are inoperative.
Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists.
- A history DTC will clear once 100 consecutive malfunction-free ignition
cycles have occurred.
Reference Information
Schematic Reference
Exterior Lights Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Testing
1. Ignition OFF, scan tool disconnected, all doors closed, all accessories
OFF, disconnect the harness
connector at the S26 Hazard Warning Switch. It may take up to 2 min for all
vehicle systems to
power down.
2. Test for less than 15 Ω between the ground circuit terminal 1 and ground.
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground
connection.
- Go to next step: If less than 15 Ω
3. Ignition ON.
4. Verify the scan tool Hazard Lamps Switch parameter is Inactive.
- Ignition OFF, disconnect the X2 harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the signal circuit terminal 3 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K9 Body Control Module.
- Go to next step: If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and
ground.
6. Verify the scan tool Hazard Lamps Switch parameter is Active.
- Ignition OFF, disconnect the X2 harness connector at the K9 Body Control
Module, ignition
ON.
- Test for less than 1 V between the signal circuit terminal 3 and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Test for less than 2 Ω in the signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K9 Body Control Module.
- Go to next step: If Active
7. Test or replace the S26 Hazard Warning Switch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Hazard Warning Switch Replacement
- Control Module References for BCM replacement, programming, and setup.
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
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