FE33 - Check HDL Circuit For Short to Ground

- Key "OFF".

- Headlamp relay disconnected.

- Breakout box installed, Powertrain Control Module (PCM) disconnected.

- Measure resistance between test pin 42 and test pins 40, 46 and 60 at breakout box.

- Is each resistance greater than 10,000 ohms?

Yes -- Remove breakout box. Reconnect all components. Refer to Lighting and Horns to check for damaged Headlamp (HDL) switch.

No -- Service short circuit. Remove breakout box. Reconnect all components. Verify elimination of idle speed concern.