Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Tests: Notes
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
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.