Hazard Lamps Malfunction

Hazard Lamps Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* 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.

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 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 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 X1 H for a short to ground. If the circuit tests normal replace the turn signal/hazard flasher module.

7. Test for less than 1 ohm between the ground circuit terminal X2 A 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 X1 H and the ground circuit terminal X2 A. 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 after completing the diagnostic procedure. Verification Tests

* Hazard and Turn Signal Flasher Replacement
* Turn Signal Multifunction Switch Replacement