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.

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for Scan Tool Information

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

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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.