Pinpoint Test Ag: The Four-Wheel Drive (2H, 4L, 4H Or 4A) RTT (RECONFIGURABLE Telltale) Indicator Is Never Or Always On (Electronic 4WD (Four-Wheel Drive))

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions
See Four-Wheel Drive RTT Indicators. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

If the 4x2 indicator request, 4x4 low indicator request, 4x4 high indicator request or 4x4 auto indicator request message is missing for less than 5 seconds, the IPC defaults the specific 4x4 RTT indicator to its last state (on or off) based upon the last message received.

If the 4x2 indicator request, 4x4 low indicator request, 4x4 high indicator request or 4x4 auto indicator request message is missing for 5 seconds or longer, the IPC sets DTC U0102:00 and defaults the specific 4x4 RTT indicator off.

Possible Sources
- Communication concern
- Message center concern
- TCCM concern
- GWM concern
- IPC

AG1 CHECK THE MESSAGE CENTER OPERATION
- Ignition ON.
- Close all doors and the hood.
- Clear all message center warnings by pressing the OK button for each warning present.
- Monitor the door ajar RTT indicator.
- Open the driver door.
- Clear the message center popup warning.
- Monitor the door ajar RTT indicator.
Is the door ajar RTT indicator off with the door closed, and on with the door open?

Yes GO to AG2

No GO to Pinpoint Test A

AG2 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to Diagnostic Trouble Code (DTC) Chart .

No GO to AG3

AG3 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (DTCs).

Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes	REFER to: Controller Area Network (CAN) Module Communications Network .

No	DIAGNOSE the four-wheel drive system. REFER to: Four-Wheel Drive Systems - Vehicles With: 2-Speed Torque On Demand Transfer Case . or REFER to: Four-Wheel Drive Systems - Vehicles With: Electronic Shift Transfer Case .