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.
Test B: The Power Liftgate Is Inoperative From An Individual Switch
2008 Lincoln Navigator 4WD V8-5.4LSECTION Test B: The Power Liftgate Is Inoperative From An Individual Switch
PINPOINT TEST B: THE POWER LIFTGATE IS INOPERATIVE FROM AN INDIVIDUAL SWITCH
Normal Operation
If the power liftgate is operated from the power liftgate control switch (instrument panel), circuit CPR63 (GY/YE) is grounded by the open/close switch, which signals the liftgate/trunk module (LTM) of the open/close request. If the power liftgate is operated from the rear switch (quarter trim panel), circuit CPR70 (GN) is grounded by the rear switch through circuit GD149 (BK/GY). If the power liftgate is operated from the liftgate handle, the smart junction box (SJB) sends a voltage signal to the LTM through circuit CPL10 (GNAVH).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Power liftgate control switch (instrument panel)
- Power liftgate rear control switch (quarter trim panel)
- LTM
- SJB
Normal Operation
If the power liftgate is operated from the power liftgate control switch (instrument panel), circuit CPR63 (GY/YE) is grounded by the open/close switch, which signals the liftgate/trunk module (LTM) of the open/close request. If the power liftgate is operated from the rear switch (quarter trim panel), circuit CPR70 (GN) is grounded by the rear switch through circuit GD149 (BK/GY). If the power liftgate is operated from the liftgate handle, the smart junction box (SJB) sends a voltage signal to the LTM through circuit CPL10 (GNAVH).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Power liftgate control switch (instrument panel)
- Power liftgate rear control switch (quarter trim panel)
- LTM
- SJB
B1:
B2-B5:
B5-B8:
B9-B10:
B11-B14:
B14-B16:
RENDER: 1.0x
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.