# Rear door will not lock or unlock with keyless or button by driver

**URL:** <https://community.cartalk.com/t/rear-door-will-not-lock-or-unlock-with-keyless-or-button-by-driver/105768>\
**Category:** Maintenance/Repairs\
**Tags:** mdx, acura\
**Created:** [July 11, 2017, 1:23am UTC](https://community.cartalk.com/t/rear-door-will-not-lock-or-unlock-with-keyless-or-button-by-driver/105768 "2017-07-11T01:23:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![kescott1910](https://avatars.discourse-cdn.com/v4/letter/k/958977/32.png) [@kescott1910](https://community.cartalk.com/u/kescott1910)\
**Post date:** [July 11, 2017, 1:23am UTC](https://community.cartalk.com/t/rear-door-will-not-lock-or-unlock-with-keyless-or-button-by-driver/105768/1 "2017-07-11T01:23:57Z")

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2006 Acura Mdx with 91K Miles. The driver side rear door will not lock/unlock either with the keyless or the keypad by driver. Any help appreciated. Thanks

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**Author:** ![Barkydog](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/barkydog/32/2470_2.png) [@Barkydog](https://community.cartalk.com/u/Barkydog)\
**Post date:** [July 11, 2017, 2:19am UTC](https://community.cartalk.com/t/rear-door-will-not-lock-or-unlock-with-keyless-or-button-by-driver/105768/2 "2017-07-11T02:19:03Z")

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Look for a broken wire in the harness that goes from the body to the door, thought 1

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [July 11, 2017, 3:18am UTC](https://community.cartalk.com/t/rear-door-will-not-lock-or-unlock-with-keyless-or-button-by-driver/105768/3 "2017-07-11T03:18:39Z")

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Concur w/Barky. Look in the area of that door, near door hinge for a group of wires passing through. Is the wire insulation damaged ? If not that, next place is probably a problem with the door lock actuator itself.

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**Author:** ![lion9car](https://avatars.discourse-cdn.com/v4/letter/l/59ef9b/32.png) [@lion9car](https://community.cartalk.com/u/lion9car)\
**Post date:** [July 11, 2017, 4:05am UTC](https://community.cartalk.com/t/rear-door-will-not-lock-or-unlock-with-keyless-or-button-by-driver/105768/4 "2017-07-11T04:05:47Z")

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Lock actuators commonly fail on Acuras of that age, so that’s my guess here.

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**Author:** ![common-sense-answer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/common-sense-answer/32/716_2.png) [@common-sense-answer](https://community.cartalk.com/u/common-sense-answer)\
**Post date:** [July 11, 2017, 1:43pm UTC](https://community.cartalk.com/t/rear-door-will-not-lock-or-unlock-with-keyless-or-button-by-driver/105768/5 "2017-07-11T13:43:31Z")

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> [@kescott1910](#):
>
> 2006 Acura Mdx with 91K Miles. The driver side rear door will not lock/unlock either with the keyless or the keypad by driver. Any help appreciated. Thanks

I had a similar issue with a rear door lock (not an Acura), very recently. I suspected a broken wire or a defective lock actuator.

I removed the door trim panel and removed the electrical connector from the actuator. Using my Factory Service Manual I identified the 2 wire colors (out of 5 wires total) for “lock” and “unlock” and their locations in the plug. Using a simple continuity light I test both positions by cycling the lock/unlock button. Both lock and unlock tested “good”.

That confirmed for me that the problem was in the actuator itself (can be quite expensive), so I ordered one. I installed it and it works fine, now.  
_ **CSA** _