Hazard Lamps Malfunction
Hazard Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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. When the switch is pressed, the signal circuit is grounded, and then completes the circuit through the turn signal lamps and the turns signal indicators. The front turn signals are grounded at G103 and G107, and the rear turn signals are grounded at G401 and G402.
Reference Information
Schematic Reference
Exterior Lights Schematics (Exterior Lights Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) 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 5 ohms between the low reference circuit terminal E and ground.
• If greater than the specified range, test the low reference 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 connectors at the turn signal/multifunction switch.
6. Verify the hazard flashers are not ON.
• If the hazard flashers are on, test the hazard switch signal circuit terminal H X1 for a short to ground. If the circuit tests normal, replace the turn signal/hazard flasher module.
7. Test for less than 5.0 ohms between the ground circuit terminal A X2 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 H X1 and the ground circuit terminal A X2. 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 turn signal/multifunction switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Hazard and Turn Signal Flasher Replacement (Service and Repair)
* Turn Signal Multifunction Switch Replacement (Turn Signal Multifunction Switch Replacement)