Headlamps Flash to Pass Inoperative

Headlamps Flash to Pass Inoperative

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 flash to pass switch signal is referenced from battery voltage by the BCM. When the flash to pass switch is activated, the switch signal circuit is closed to ground and the signal circuit voltage goes low, indicating to the BCM the switch is active.

Circuit/System Verification

Ignition ON, pull and release the flash to pass switch. The high beam headlamps should flash on and off.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X2 at the turn signal/multifunction switch.
2. 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.

3. Ignition ON, verify the scan tool flash to pass switch parameter is off.

^ If not the specified value, test the signal circuit terminal X2 B for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3A fused jumper wire between the signal circuit terminal X2 B and the ground circuit terminal X2 A. Verify the scan tool flash to pass switch parameter is on.

^ 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 BCM.

5. If all circuits test normal, test or replace the turn signal/multifunction switch.

Repair Instructions

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

* Turn Signal Multifunction Switch Replacement