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2010 ML: Child lock not behaving as expected

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2010 ML: Child lock not behaving as expected

Old 10-09-2018, 02:19 PM
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2010 ML: Child lock not behaving as expected

On my 2010 ML350, I frequently have passengers in the rear who are unable to get out from the rear-right door. I've checked to be sure that the child lock switch is in the correct, unlocked, position.

Without driving the car, I've tested the switch in the locked position to see if it prevents me from opening the door from the inside and it seems to work. And also without driving the car, I've tested it in the lock position and it seems to work. But with the child lock in the unlocked position, and after driving, where the auto-lock system locks all the doors, when I come to a stop and turn off the car, passengers can't get out of the right, rear door. They are able to get out of the left-rear door just fine.

Am I doing something wrong or does the door lock actuator mechanism need to be replaced?

Last edited by Eich; 10-09-2018 at 02:22 PM.
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Old 10-10-2018, 05:48 AM
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Your explanation is a little confusing.

What happens if you pull up the door knob? Can you open the door from the inside or the outside door handle?

What happens if you use the key fob to unlock all doors?
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Old 10-10-2018, 10:57 AM
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Originally Posted by Maj. Dundee View Post
Your explanation is a little confusing.

What happens if you pull up the door knob? Can you open the door from the inside or the outside door handle?

What happens if you use the key fob to unlock all doors?
If I use the Key Fob to unlock all doors, the right-rear passenger still cannot get out. Pulling up on the door lock knob, still cannot get out.

However, if I use the unlock button on the driver's door panel, then the right-rear passenger CAN get out.

To me, it seems as if the right-rear door is ALWAYS in child lock mode, regardless of the position of the mechanical "Switch" on the door.

For now, I just disabled the auto-lock feature so that the car does not lock itself when I start driving. And now, the back doors are only locked when we're all out of the car.
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Old 10-11-2018, 06:36 AM
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According to the instructions, you should be able to open the door by pulling the outside door handle. Does it?

You should have the codes read with a scanner to narrow things down.
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DTC Door CM R-F Eng. 113.pdf (52.8 KB, 3 views)
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Old 10-11-2018, 09:03 AM
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Yes, I am able to open the door by pulling the outside handle.

I'll check for codes. But my feeling at this point is that the mechanical child lock switch on the rear, right-side door just doesn't work and is always in child-lock mode, regardless of its position. The rear-left door works as you would expect.

Last edited by Eich; 10-11-2018 at 09:06 AM.
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Old 10-11-2018, 10:50 AM
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Well if you feel that way, then you need a new right rear door lock.
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Old 10-11-2018, 02:10 PM
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I'm willing to bet that I do, indeed, need a right-rear door lock actuator assembly. I see no difference in behavior of the right-rear door, regardless of the position of the child lock switch.

But I will definitely check for codes first.
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Old 10-11-2018, 02:43 PM
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Maj. Dundee - would you happen to know the part number for the Right Rear Door Lock Actuator for a 2010 with the Child Lock feature?
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Old 10-12-2018, 05:30 AM
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Post your full vin#.
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Old 10-12-2018, 08:33 AM
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VIN: 4JGBB8GB5AA565151


I THINK the part number is: 1647303435 But it would be much appreciated if you could confirm!

Last edited by Eich; 10-12-2018 at 08:38 AM.
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Old 10-12-2018, 09:20 AM
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Originally Posted by Eich View Post
VIN: 4JGBB8GB5AA565151


I THINK the part number is: 1647303435 But it would be much appreciated if you could confirm!
Yes it is. Ask the dealer if that includes the child lock, just to make sure.
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Old 10-12-2018, 09:46 AM
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Don't order anything as yet, let me check the wiring diagrams.
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Old 10-12-2018, 10:36 AM
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I hope this isn't an electrical problem with the power window switch group which has only one ribbon connector. Testing it is unthinkable.
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Old 10-12-2018, 10:58 AM
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Originally Posted by Maj. Dundee View Post
I hope this isn't an electrical problem with the power window switch group which has only one ribbon connector. Testing it is unthinkable.
Thanks for this. I'm trying to understand in my mind, how it could be an electrical problem. Here's some tests I did:

I sat inside the car with both rear doors having the Child Lock mechanical switch in the unlocked position.

TEST 1:
I locked the doors with the lock button on the driver's door panel. Then I unlocked them with the unlock button on the driver's door panel.
Result: Left-rear door will open from the inside. Right-rear door will ALSO open from the inside.

TEST 2:
I locked the doors with the key fob. Then I unlocked the doors with the key fob.
Result: Left-rear door will open from the inside. Right-rear door will NOT open from the inside. It will open from the outside.

Then I switched the child lock switch to the locked position on the right-rear door and did the same tests. Results were the same. I guess the driver's door panel unlock button overrides the child lock.

Electrically, things seem to work.. But the position of the child lock switch on the right-rear door seems to have no effect on its operation. It always behaves like it's locked.
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Old 10-12-2018, 01:12 PM
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I wish you luck on this. Post back with results after the new lock is installed.
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Old 10-12-2018, 01:30 PM
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Originally Posted by Maj. Dundee View Post
I wish you luck on this. Post back with results after the new lock is installed.
Will do. Thanks again for your help. I've contacted a salvage yard to see if I can get a used one. I'm not going to pay USD $400+ for a new one. If I can't find one at a decent price (under $200), then I'll just live with it. By setting the car to never auto-lock the doors, I don't run into this issue.
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