Multiple Electrical Issues! (15 Viewers)

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JST

Joined
Aug 1, 2025
Threads
1
Messages
4
Location
UK
Hi all,

I’ve always lusted after a 100 or 200 series and fate brought me to purchase one which randomly popped up on marketplace 5 miles down the road!

It’s a 2011 4.5 V8 diesel with a pretty good spec. It’s done 120,000 miles and is in fantastic condition underneath and under the bonnet. I managed to pick it up at significantly less than market value. I absolutely love it and expect that this will be the beginning of a lifetime of Land Cruiser ownership!

However…

I have a number of electrical issues, most of which I was aware of at purchase. This appears to be down to water ingress.

I have done a search of the forums but some posts relating to these issues are old and I expect there will become greater knowledge of these issues as the 200 series age. I was also wondering if some of these problems may be linked to one another.

1. Stereo does not power on (nav screen works). Bluetooth also does not attempt to connect.

2. Climate control error - fan blows but it would appear that the servos to control flow are not operating. I can hear the air conditioning compressor switch when I press the AC button on the dash.

3. Master window switch operates drivers window only (99% of the time). Auto up/down on driver’s is a bit unpredictable. Door lock button is also dead. I have read about the calibration procedure but this has not helped and I assume, given that it will operate the other windows occasionally, that it’s a connection or something failing. When the headlights are on, only the driver’s window switch is illuminated. Whilst driving, the other window switch lights on the master switch sometimes flicker. I do have code B1206 for this.

4. Sunroof often takes 3+ attempts to close the last couple of inches, although doesn’t appear stiff or under heavy load. Also lots of wind noise whilst closed, slightly reduced by opening upwards a little.

5. Total park assist failure. Continuous beep for a few seconds upon selecting reverse, no light on parking sensor master switch. Rear camera feed does not appear on the information screen.

I hope that some of the above will be down to poor connections behind the dash or in the footwell. It would be great if somebody could point me towards any specific connectors which may relate to the above. I’m pretty handy with a multimeter if anyone has a wiring diagram?

Other than that, I guess I’m looking at replacing rather costly modules but given the scarcity of these vehicles in the UK, there’s not much opportunity to buy used parts or run tests using somebody else’s window switch, for example.


Any help is greatly appreciated! If anybody in the UK knows of any wizards with the 200 series, I’m happy to invest in some skilled labour to get it sorted.

James
 
Do this and check the connectors in frame at 0:45 for corrosion in the terminals. If there is corrosion present or other evidence of water having been in the area you likely need to clean your sunroof drains.

 
Thanks, that’ll be my first job tomorrow! Do you know what function each connector block performs?
 
Do you know what function each connector block performs?

Basically, everything.

In all seriousness, those are fundamental connectors to nearly every system in the vehicle. You just need to get in there and assess the potential damage and work from there. Often enough there isn’t any usable pin/terminal left to repair so people are forced to bypass the connectors with crimped in wire.

I think it is safe to consider the sunroof drain system the Achilles heel of this platform.
 
So I’ve had a look in there and yes, there is a small amount of green dust in some connectors - nothing which would require more than a deep clean I would say. Since removing and replacing the connectors, I’ve lost remote central locking (key buttons and keyless entry). All doors are unlocked but I cannot open the tailgate. Is this something I’ve disturbed or have I upset the system and need to recalibrate? I’ve tried unplugging and re-plugging the connectors multiple times.
 
Some of those pins are so small the damage can be hard to spot. I’d do that deep clean and a very close inspection and see where it gets you.

I don’t know about anything that would require recalibration after disconnection.. it’s not like that should be any different than disconnecting the battery. Did you disconnect the battery while inspecting? But depending on what has a poor connection, like any of the CANBUS wires as an example, a single circuit can impact an entire communication chain of multiple modules in the vehicle.

I will say it sounds like you are having more issues than is typical for water damage in those connectors, but they are so important to so many systems IMO it’s the low-hanging fruit of sorting out electrical gremlins if there’s *any* evidence of water damage present.
 
Basically, everything.

In all seriousness, those are fundamental connectors to nearly every system in the vehicle. You just need to get in there and assess the potential damage and work from there. Often enough there isn’t any usable pin/terminal left to repair so people are forced to bypass the connectors with crimped in wire.

I think it is safe to consider the sunroof drain system the Achilles heel of this platform.
Bloc, I agree with everything that you say with one small difference. I believe that the cowl is the “heel”. Both my ‘08 LC and ‘14 LX have had water problems after the drains were cleared and I believe that the weak point is the cowl.
And, JST, any “green” on the connectors seem to cause “micro shorts” that cause havoc with everything from door locks to seat heaters so you have to remove as much of it as possible. And the application of dielectric grease is a bit of a controversy on the board but I am a firm believer and have used it on both vehicles with success.
 
Bloc, I agree with everything that you say with one small difference. I believe that the cowl is the “heel”.

Fair point.. If we could get non-sunroof 200s here the cowl would be the undisputed champ.

They are both significant design flaws.
 
Well, a reasonably successful day was had, thanks to the help proffered here.

The loss of remote central locking was my fault - I had not tightened the 10mm hex bolts securing some of the multi-plugs at the bottom of the A pillar. I presumed that they were for retention, rather than to drive the plug home in order to make a connection, so left them loose during my initial investigation.

A connector in the passenger footwell was to blame for all of the window trouble! I haven’t done a particularly thorough job of the cleaning as I intend buying some micro brass jet cleaning brushes, however, all switches are working, including the internal door lock switch!

I’ve calibrated the sunroof which has solved the problem of it ‘bouncing’ back open when nearly closed (also added lots of PTFE lube). However, it now only moves whilst the button is depressed, there is no auto function for movement in any direction.

I also have functioning climate control! AC doesn’t work (trips out after 5 seconds) but I expect that will be a re-gas required.

Any clues on checking for power to the stereo? Does this come through the amp?
 
Glad you're making progress. In the US all 200s had the JBL stereo with Nav, and I believe the second detail heavily influences the wiring diagrams.

Does yours have navigation?
 

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