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 5a: Hazard Warning Switch StuckDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Hazard Switch Signal | B3596 5a | B3596 5a | 1 | -- |
Hazard Switch Telltale Control | B3795 02 | B3795 02 | B3795 05 | B3795 0f |
Hazard Switch Ground | -- | 1 | -- | -- |
1. Hazard Lamps Malfunction | ||||
Circuit/System Description
The hazard flashers may be activated in any power mode. The hazard switch is located on the accessory control panel and is permanently grounded through ground G205. When the hazard switch is placed in the ON position, ground is applied through the hazard switch signal circuit to the instrument panel cluster (IPC). The IPC responds by sending a serial data message to the underhood electrical center (UEC) and the rear electrical center (REC) requesting the front and rear turn signal lamps be illuminated in an ON and OFF duty cycle. The UEC and REC respond by applying voltage to there respective turn signal control circuits illuminating the front and rear turn signal lamps ON and OFF. The IPC is also responsible for cycling both turn signal indicators ON and OFF. The IPC illuminates the hazard switch telltale by applying voltage to the hazard switch telltale signal circuit.
Conditions for Running the DTC
| • | Battery voltage must be between 9-16 volts. |
| • | Hazard lamps ON. |
Conditions for Setting the DTC
The DTC will set when the IPC detects a short to ground or an open/high resistance in the hazard switch signal circuit.
Actions Taken When the DTC Sets
When DTC B3596 05 is present, the hazard switch signal circuit will be disabled.
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
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the hazard switch.
- Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal 2.
- Ignition ON, verify the scan tool Hazard Warning Switch parameter is OFF.
- Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Hazard Warning Switch parameter is ON.
- If all circuits test normal, replace the hazard switch.
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the IPC. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for IPC replacement, setup, and programming |
