2018 nx300h back hatch beeps but doesn't open
I think I unintentionally led you astray with this comment in Post #11: "~less than 10 Ohms", which turned out to be inaccurate. Your 0.983 measurements are both stable and consistent between sensors. This tells me they represent the resistors connected in parallel with each sensor. not the sensor element resistance. If using an auto-range meter, 0.983 may have been actually indicating 0.983 kΩ (983 Ohms, or ~1kΩ). The 15 - 50 Ohm measurements therefore represent the depressed resistance. My conclusion: the sensors are both OK and resistances agree with the Lexus description.
Given the observed symptoms, a failed pinch sensor was a good first suspect, but is time to move on to the next. My choice wound be the motor inside one of the power struts is not operating. When only one operates, the entire hatch may tend to bind and the one strut trying to do the work of two trips its internal overcurrent protection. Here are 3 ways you could attempt to confirm (or refute) this theory:
(1) Open the hatch part way by hand, high enough so you can wrap your hand around each strut, one at a time, at a point closer to the roof, to see if you can feel the motor running while a helper operates the opener switch.
(2) Operate the opener switch numerous times in succession until the hatch has been moved from closed to nearly open. Now immediately feel each strut to see if one is noticeably warmer than the other.
(3) Stand behind the vehicle while a helper operates the opener switch multiple times. Look for one side to consistently rise more readily than the other each time the hatch moves a small amount, then stops.
Given the observed symptoms, a failed pinch sensor was a good first suspect, but is time to move on to the next. My choice wound be the motor inside one of the power struts is not operating. When only one operates, the entire hatch may tend to bind and the one strut trying to do the work of two trips its internal overcurrent protection. Here are 3 ways you could attempt to confirm (or refute) this theory:
(1) Open the hatch part way by hand, high enough so you can wrap your hand around each strut, one at a time, at a point closer to the roof, to see if you can feel the motor running while a helper operates the opener switch.
(2) Operate the opener switch numerous times in succession until the hatch has been moved from closed to nearly open. Now immediately feel each strut to see if one is noticeably warmer than the other.
(3) Stand behind the vehicle while a helper operates the opener switch multiple times. Look for one side to consistently rise more readily than the other each time the hatch moves a small amount, then stops.
I decided to order replacement struts. Since the pinch sensors appear to be fine, I couldn't think of anything else that could be a problem. They arrive at the end of this week - I'll update here once I replace them. Thanks again for thinking through this with me!
I've read the same, I just don't know how I'd test anything in the hatch without raising and lowering them manually... Thanks for sharing this advice!
I want to thank everyone who offered advice on diagnosing this issue.
Once I followed @n0v8or diagnostic advice above, and it didn't appear to be the pinch sensors, I ordered an aftermarket set of replacement struts. Yesterday morning I replaced the struts. I had already removed the panels from the back hatch when I was testing the pinch sensors, so, replacing the struts was literally a 30 minute task. Each side had 4 bolts, and one cable to disconnect.Once I replaced both sides, everything worked perfectly.
Total cost: $157, and took me about 2 hours if you include diagnosing the pinch sensors and watching a couple videos online that gave me the confidence to safely replace the struts.. The dealer wanted more than 10x that amount to fix the issue.
This forum is an amazing resource!
Once I followed @n0v8or diagnostic advice above, and it didn't appear to be the pinch sensors, I ordered an aftermarket set of replacement struts. Yesterday morning I replaced the struts. I had already removed the panels from the back hatch when I was testing the pinch sensors, so, replacing the struts was literally a 30 minute task. Each side had 4 bolts, and one cable to disconnect.Once I replaced both sides, everything worked perfectly.
Total cost: $157, and took me about 2 hours if you include diagnosing the pinch sensors and watching a couple videos online that gave me the confidence to safely replace the struts.. The dealer wanted more than 10x that amount to fix the issue.
This forum is an amazing resource!
Last edited by rskrx400h; Nov 28, 2025 at 05:04 AM.
@rskrx400h had came across a handful of posts from frustrated 1st gen NX owners who had to replace their struts w/after market units and had fitment problems, mainly from incorrectly sent parts ( dodgy part numbers being the main culprit ) from vendor.
Please share where you purchased yours w/link to vendor and the relevent part numbers to help other owners who will be needing replacement struts in the future. Much thanks.
Please share where you purchased yours w/link to vendor and the relevent part numbers to help other owners who will be needing replacement struts in the future. Much thanks.
@Lexura16 I bought them on eBay, from a seller named: SpeedMateAutoParts. Here's the link to the item I purchased: https://www.ebay.com/itm/387363071555
@Lexura16 I bought them on eBay, from a seller named: SpeedMateAutoParts. Here's the link to the item I purchased: https://www.ebay.com/itm/387363071555
LIFTGATE LIFT SUPPORT (LEFT)
Part Number: 689600WA31
689600WA31 - Lexus Liftgate Lift Support (Left). BACK, Door | Bell Lexus North Scottsdale, Scottsdale AZ
689600WA31 - Lexus Liftgate Lift Support (Left). BACK, Door | Treasure Coast Lexus, Ft. Pierce FL
LIFTGATE LIFT SUPPORT (RIGHT)
Part Number: 689500WA31
689500WA31 - Lexus Liftgate Lift Support (Right). BACK, DOOR | Bell Lexus North Scottsdale, Scottsdale AZ
689500WA31 - Lexus Liftgate Lift Support (Right). BACK, DOOR | Treasure Coast Lexus, Ft. Pierce FL
OR there’s always Prestige Lexus (NJ)
Last edited by RofH; Nov 28, 2025 at 07:03 PM.
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