Hazard Lamps Malfunction

Hazard Lamps Malfunction

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.

Diagnostic Fault Information





Circuit/System Description

The hazard switch is an input to the turn signal/hazard flasher module, and when the switch is pressed the signal circuit is grounded. When the hazard switch is pressed, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G103 and G107. The rear turn signals are grounded at G401 and G402.

Reference Information
Schematic Reference

Exterior Lights Schematics (Wiring Diagram Index)
Connector End View Reference

Component Connector End Views (Component Connector End 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 (Control Module References) for Scan Tool Information

Circuit/System Verification

Observe the left and right, front and rear turn signal lamps while the hazard switch is on.

If one or more of the lamps flash normally, refer to Turn Signal Lamps and/or Indicators Malfunction (Turn Signal Lamps and/or Indicators Malfunction).

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the turn signal/hazard flasher module.
2. Test for less than 1 ohm of resistance between the ground circuit terminal E and ground.

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

3. Verify that a test lamp illuminates between the B+ circuit terminal K and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Connect the harness connector at the turn signal/hazard flasher module.
5. Disconnect the harness connector at the DIC switch.
6. Verify the hazard flashers are not on.

• If the hazard flashers are on, test the hazard switch signal circuit terminal 2 for a short to ground. If the circuit tests normal replace the turn signal/hazard flasher module.

7. Test for less than 1 ohm of resistance between the ground circuit terminal 5 and ground.

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

8. Install a 3A fused jumper wire between the hazard switch signal circuit terminal 2 and the ground circuit terminal 5. Verify the hazard flashers operate normal.

• If the hazard flashers do not operate, test hazard switch signal circuit for an open/high resistance. If the circuit tests normal replace the turn signal/hazard flasher module.

9. If all circuits test normal replace the DIC switch.

Repair Instructions

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

Hazard and Turn Signal Flasher Replacement (Service and Repair)