How to adjust the "beep" on the passenger seat?

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How to adjust the "beep" on the passenger seat?

Postby editsnail » Fri Feb 12, 2021 11:46 am

Hi,

Brand new to the forum so please excuse me if this is the wrong subforum to post this in.

I have been searching the web a lot about my newly bought (2nd hand) 2004 liberty GT lately and this forum often pops up, so I thought I should register.

I am wondering is there a way to increase the Kg required to set off the front passenger seat beep. Or is it simply a matter of "plug in the seat belt" when carrying things in the passenger seat. I dont want to disconnect it completely which seems to be the internets answer but I have read there is "a spot" to avoid which doesnt seem to be conveniently shown in a picture.


I often find even a couple of 1.25 bottles of soft drink set it off so Im thinking its around 2-3Kg, I was hoping to increase it to 5-10Kg.
Any advice is welcome, I have so many more questions but lets leave it at this one for starters.

Thanks.
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Re: How to adjust the "beep" on the passenger seat?

Postby Yowie » Fri Feb 12, 2021 1:13 pm

Welcome to the forum.

I suspect (without any proof) that the "passenger seat weight detector" is an on-off switch rather than anything more finely calibrated (or adjustable).

The "plug in the seatbelt" solution or "rearrange how you transport goods" solution might be the most practical.

It would be interesting if there are some practical options around this however.
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Sun Feb 14, 2021 3:30 pm

Hmm... I just went to unplug the driver's seatbelt sensor, and found a can of worms...

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I'd noticed the seat moving around and making clunks now and then, so I thought I'd better investigate... Turns out the raise/lower mechanism has crapped out on the inboard side - the little L-bracket on the back has let go around the pivot, which has led to the bracket on the front of the parallelogram on that side fatiguing off its spot welds. Almost the whole seat (and passenger) is hanging off that parallelogram.

Bit of a mission to disassemble the bugger... Bit of a strain on the memory too, to have to leave reassembly for a while (gonna have to fix it at work).

Anyway, I might have a look at the weight switch for ya... Hang on, there won't be one for the driver's side, will there.
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Re: How to adjust the "beep" on the passenger seat?

Postby Yowie » Sun Feb 14, 2021 3:45 pm

Common enough issue.

I've fixed both mine and my wife's electric seats when that spot weld breaks free.

You can drill/tap/bolt that right-hand arrowed piece to where it is supposed to sit without pulling much/any of the seat apart (once you have removed it).

Image
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Sun Feb 14, 2021 5:16 pm

Here's your sensor, anyway...

rsz_20210214_181126.jpg
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Pretty hard to get to. The little bits of curled wire that hold the upholstery on are a bastard to get back on too. Anyway, i guess you could put it between a couple of firm bits of plastic like corflute and put that sandwich under the cushion, above the springs... I reckon that'd make it more like the best part of ten kilos before it sensed...
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Sun Feb 14, 2021 5:24 pm

Yowie wrote:Common enough issue.

I've fixed both mine and my wife's electric seats when that spot weld breaks free.

You can drill/tap/bolt that right-hand arrowed piece to where it is supposed to sit without pulling much/any of the seat apart (once you have removed it).

You don't mention the broken bracket... Have you come across that before?

I've ground off the riveted flange on the pin, which has two ODs, the smaller of which goes through the broken part. So I'll weld the bracket together and clean it up, put it together and weld the pin to the bracket, captive on the raise/lower arm, stronger than before.
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Re: How to adjust the "beep" on the passenger seat?

Postby Yowie » Sun Feb 14, 2021 5:40 pm

You don't mention the broken bracket... Have you come across that before?


No, just the right-hand arrowed bit. The Left-hand side looks like a bit of a mess. Just as well you can weld. Good luck with it.
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Sun Feb 14, 2021 7:41 pm

So this is how the seatbelt and weight sensors work:

In the driver's seat, no weight sensor. The seatbelt sensor has three wires, black, black with a red stripe and black with a blue stripe. With no belt inserted, black is connected to red stripe, when it's inserted, black's connected to blue stripe.

In the passenger's seat, there's just a two pin plug for the weight sensor and the seatbelt sensor - the weight sensor (normally open) is in series with the seatbelt sensor (normally closed), so it knows if there's weight in the seat but no seatbelt inserted. But weight in the seat with a belt inserted is the same as an empty seat as far as the signal through that connector is concerned.

There's also a yellow plug in each seat, which runs to something in the seat back - the yellow stuff is airbag business. It appears to be entirely separate to the seatbelt alarm.
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Re: How to adjust the "beep" on the passenger seat?

Postby Yowie » Sun Feb 14, 2021 7:55 pm

In the driver's seat, no weight sensor. The seatbelt sensor has three wires, black, black with a red stripe and black with a blue stripe. With no belt inserted, black is connected to red stripe, when it's inserted, black's connected to blue stripe.


Cracking work. :D

So if the seatbelt alarm got on one's tits (hypothetically), one could permanently bridge the black & blue-stripe wires by the look of it.
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Sun Feb 14, 2021 8:10 pm

I often like to whip off my belt before I reverse park (reverse camera notwithstanding), but the hideous scream these cars make about it has to die, along with the same ridiculous carry-on if you sit a bag in the passenger seat...

It's good to see disabling it for both seats apparently has nothing to do with the airbag stuff, unlike what I've seen said here and there.
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Sun Feb 14, 2021 8:20 pm

By the way, unplugging those yellow airbag loom connectors is a horror show.

There's the normal button on the male plug / female pin side, but also a green slider on the female plug / male pin side. You have to press the button before you push the slider, or it won't come open. I think it helps if you push the plugs together while trying to do this bastard crap.

You can also shove a screwdriver between the plug and the tab on the seat chassis to free the damn thing so you can actually see what you're doing.
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Mon Feb 15, 2021 1:04 pm

Yowie wrote:
You don't mention the broken bracket... Have you come across that before?


No, just the right-hand arrowed bit. The Left-hand side looks like a bit of a mess. Just as well you can weld. Good luck with it.
That's weird... I figured the spot welds broke because the bracket on the back broke. I guess they also get fatigued when the driver plonks into the seat...

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rsz_20210215_133045.jpg
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Wed Feb 17, 2021 6:20 pm

Busted spot welds
rsz_20210217_190903.jpg
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Assembled the damn thing next to the car. It's like 28kg!
rsz_120210215_195626.jpg
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Oh yeah, the seatbelt sensor's three wires plug into a plug with only two, lol. No red stripe, only the blue one, so I stuck a bit of wire in it and taped it over.
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Re: How to adjust the "beep" on the passenger seat?

Postby Kimmo » Thu Feb 18, 2021 10:14 am

Whoops, that was wrong.

All you've gotta do is unplug the plug for each seat and you're golden.
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Re: How to adjust the "beep" on the passenger seat?

Postby Yowie » Thu Feb 18, 2021 10:37 am

Are you talking about airbag (yellow) wires or the seatbelt wiring there?
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