Pinpoint Tests: Notes

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

The Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly

Refer to Four Wheel Drive Systems for schematic and connector information.

The Manual Shift-On-Stop (MSOS) system mode indicator status is transmitted to the IPC from the Mode Indication Switch (MIS). The IPC receives the 4X4 high and 4X4 low input hardwired from the MIS (4X4 high/low indicator switch). When 4X4 high is selected, the MIS provides a ground on the 4X4 high input circuit. When 4X4 low is selected, the MIS provides a ground on both the 4X4 low input circuit and the 4X4 high input circuit. The IPC monitors the 4X4 high and 4X4 low inputs and when the applicable grounding is detected, the IPC turns on the appropriate 4X4 indicator. When the vehicle is in 4H mode, 4X4 HIGH is displayed in the IPC message center (if equipped). When the vehicle is in 4L mode, 4X4 LOW is displayed. No indicators are displayed in the message center when the transfer case is in NEUTRAL or 2H mode.

Possible Sources

Wiring, terminals or connectors
Mode Indication Switch (MIS)
IPC