GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

SRS front left failure '07 320

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Old Oct 13, 2015 | 10:13 PM
  #1  
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Land Rover Discovery series I
SRS front left failure '07 320

Ok, here's what I know:
There's no seat switch for the driver's seat.
Many people have said a wire frays on the seat belt latch switch.
There are two wires with yellow plugs that go up inside the back of the seat.

I'm assuming one of the yellow plugs go to the seat side airbag, where does the other one head to? I had the seat bottom out tonight and that was a PITA. I got all my wires plugged back in and now my intermittent SRS failure has become a permanent SRS light.

Have I caused the code to become permanent since I unplugged the wires and plugged 'um back in? Any leads here or am I destined to have a money pit in my garage?
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Old Oct 14, 2015 | 08:32 AM
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You really need to read the car. The code will specifically tell you what is wrong with the srs.

Most srs- related problems are not intuitive and do not lend themselves to guess and replace tactics
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Old Oct 14, 2015 | 08:32 AM
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You really need to read the car. The code will specifically tell you what is wrong with the srs.

Most srs- related problems are not intuitive and do not lend themselves to guess and replace tactics
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Old Oct 14, 2015 | 12:05 PM
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Land Rover Discovery series I
I assume this is a code you cannot retrieve with a standard OBDII scan tool but that a Star diagnostic machine would be nessacary?
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Old Oct 14, 2015 | 01:26 PM
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From: Emmett, ID, USA
2007 GL450
Originally Posted by Captincvmn
Ok, here's what I know:
There's no seat switch for the driver's seat.
Many people have said a wire frays on the seat belt latch switch.
There are two wires with yellow plugs that go up inside the back of the seat.

I'm assuming one of the yellow plugs go to the seat side airbag, where does the other one head to? I had the seat bottom out tonight and that was a PITA. I got all my wires plugged back in and now my intermittent SRS failure has become a permanent SRS light.

Have I caused the code to become permanent since I unplugged the wires and plugged 'um back in? Any leads here or am I destined to have a money pit in my garage?
I had an SRS failure and it was caused by a bad 15R relay.

You are destined to have a money pit in your garage. MB's engineering is notoriously hit or miss. The body, the engine, the interior - as alx said, these trucks age well. But there are a few inevitable repairs, like the air springs, the cam sensors, the transmission conductor plate ... And, as you figured out, the electrical system is not that great. I've had two significant electrical problems with my GL. Yet still I can't bring myself to get rid of it, because it drives great.

Last edited by eric_in_sd; Oct 14, 2015 at 07:27 PM.
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Old Oct 14, 2015 | 06:31 PM
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E55, GLS450, GL63, GLE350
What issues did you have with your 450?
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Old Oct 14, 2015 | 07:25 PM
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From: Emmett, ID, USA
2007 GL450
Originally Posted by BlownV8
What issues did you have with your 450?
Holy crap, what issues didn't I have!

Probably need to replace the conductor plate in the tranny. It did one of those sticking-in-third-gear things.

All four air springs.

Burns oil. Not horrendously, but ... it burns oil fast enough that I don't even bother changing the oil anymore. Just the filter.

One ECU died. Left me stranded. It's hard for me to remember the last time a car told me, eff you, start walking.

Window switch is now stuck.

Had to replace the back hatch motor.

Ball joints in the rear squeak.

Looks like my cats are on their last legs. Unfortunately, I live in California.

Camshaft magnets thingy. I was able to change the magnets on the intake side, but there's too much junk in the way to change the exhaust ones. Fortunately, no CEL errors on those. But I have the magnets, just in case.

Tumble plate in intake manifold: $1600 for a piece of plastic!!!

There's more, but I don't have the stomach to think about it now.

But you know what? I love the interior. I love the German austerity and solidity. I love driving it. (Except for the throttle lag, and I got a sprint booster but haven't installed it yet.) I love how the exterior looks. Jeez - the second generation GLs look like minivans. Went on a camping trip, five of us, all our stuff, sailing up 395 at 90+ mph, didn't even break a sweat.

It's weird. I have a real love-hate relationship with it. There's stuff about it I love, and stuff about it I hate, and not much in between.
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Old Oct 14, 2015 | 09:00 PM
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Land Rover Discovery series I
I too have squeaky ball joints or at least an A-arm bushing squak in the driver's side front. Under braking it makes racket but not during suspension travel. I've yet to identify the exact culprit and change it out.

I'll have to look for that relay you mentioned. I did notice that the SRS light illuminated mostly around right hand turns but now it's on constantly. My air ride valve block is acting stupid now. Random corners are going down over night. I think it's the valve body because I've tried the high height setting and spray soaping the bags but I saw no bubbles.
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Old Oct 14, 2015 | 09:33 PM
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From: Emmett, ID, USA
2007 GL450
If you have the suspension lift feature, in which the whole vehicle lifts about 3" for off road, turn that on. After the vehicle has finished lifting, then do the soapy water trick. On the Arnott spring I just replaced, there were fine leaks (making a foam from the soapy water) in a row, presumably right at where the air bag folds. For reasons I'm not clear on, the row of leaks was on the outside only.

The problem with doing the soapy water test at normal ride height is the leaks, at least in my case, were right where the bag folds under. So it could be really hard to spot those leaks when you're at normal ride height.
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Old Oct 14, 2015 | 09:37 PM
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From: Emmett, ID, USA
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Originally Posted by Captincvmn
I assume this is a code you cannot retrieve with a standard OBDII scan tool but that a Star diagnostic machine would be nessacary?
OBD is fundamentally emissions related. So there's lots of stuff in the computers that never makes it out the OBD protocol.

Listen to alx. He knows his stuff.
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Old Oct 14, 2015 | 11:14 PM
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Land Rover Discovery series I
Thank you everyone for the input. This journey down the Mercedes Benz Boulevard is one I never imagined I would have the opportunity to take. I'll get her fixed and attempt to keep her that way.
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