On an equipped GX, first try L4 with the center differential locked; if one rear wheel still spins, stop all wheels, press the rear-differential-lock switch and wait for both indicators to stay on.
Check that your vehicle has it.
Verified in the 2025 U.S. Lexus GX 550 owner's manual when equipped. The named Overtrail grades are the intended factory off-road configurations; confirm the rear-lock switch in the specific vehicle.
- Retail trim / version
- GX 550 Overtrail, GX 550 Overtrail+
- Required equipment / service
- L4, center differential lock and electronic rear differential lock, GX 550 grades equipped with electronic locking rear differential
Does the documented scope match your car?
This check combines the verified year, any source-supported powertrain scope, source-named trim/package and required equipment. It does not read a VIN or factory build record.
Published availability and qualifications
Verified in the 2025 U.S. Lexus GX 550 owner's manual when equipped. The named Overtrail grades are the intended factory off-road configurations; confirm the rear-lock switch in the specific vehicle.
Know what kind of control to look for.
This original category diagram is an orientation aid, not a picture of your exact trim. Use the written labels and your vehicle manual to identify the real control.
Step by step.
- 01
Use L4 with the center differential locked first and request the rear locker only if wheelspin still prevents movement.
- 02
Stop all wheels completely, then press the rear differential lock switch.
- 03
Wait until the rear-lock indicators stop blinking and remain illuminated before moving.
- 04
Drive below 5 mph, and press the switch to unlock as soon as the vehicle is free; confirm both indicators go out.
Important limits
- Do not lock while wheels are spinning, during normal road driving or above 5 mph.
- ABS, brake assist, VSC, Downhill Assist Control and Active TRAC do not operate normally while the rear differential is locked.
Quick checks.
- ✓If an unlock indicator keeps blinking, move slowly in a safe open area while turning the steering wheel slightly in either direction.
- ✓If the indicators continue blinking, stop using the locker and have the four-wheel-drive system inspected by a Lexus dealer.
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2025 Lexus GX 550 Owner's Manual — Rear Differential Lock
Relevant section or page: Pages 389–390. We use the written official source to determine the steps and applicability shown above.
Reviewed with a visible trail.
Scope and steps were checked by Car Cheat Codes Editorial Review. A guide is narrowed or corrected when the source does not support a broader claim.
- Published
- Last modified
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Guide change history
- Initial verified publication.