Isolating centre diff lock

Submitted: Tuesday, Jan 03, 2017 at 08:24
ThreadID: 134037 Views:3738 Replies:7 FollowUps:4
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Has anyone had experience with fitting an isolating switch to a centre differential ?

On my 100 series manual cruiser the centre diff lock is automatically engaged when low range is selected no option.

In my case i have a driveway thay would be easier to negotiate in low range (without locking centre diff and transmission wind up that occurs ). Would make reversing a large van mutch easier on the clutch.

Thankyou for your thoughts.
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Reply By: Shaker - Tuesday, Jan 03, 2017 at 08:30

Tuesday, Jan 03, 2017 at 08:30
I will watch this with interest as I have a Prado & have the same problem.

AnswerID: 607181

Reply By: Crusier 91 - Tuesday, Jan 03, 2017 at 08:37

Tuesday, Jan 03, 2017 at 08:37
I did the mod on my 80 series 3 years ago. Its fantastic!!!!!
No isolation switch required on mine. Just pulled out a wire which allows me to operate the centre diff lock manually in low range just like in high range.
Well worth doing.
If the CDL button operates the same way in the 100s as the 80s you can find step by step instructions on how to do the mod on offroad80s.com
It is simple to do.
Cheers
AnswerID: 607182

Reply By: Athol W1 - Tuesday, Jan 03, 2017 at 08:47

Tuesday, Jan 03, 2017 at 08:47
Tim
If you get under your car and look at the rear of the transfer case you will find a wiring loom plug at about the 1.00 o'clock position (tailshaft being centre of clock). Just by the removal of this plug you will find that Low Range can be engaged without the automatic application of the centre diff lock. It has NO other impact on the operation of the vehicle. Centre diff lock can then be manually engaged the same as when in high range. There is no need to fit any additional switches to the vehicle.

It is some years (about 10 and 2 changes of vehicle) since I did that to my 100s td auto for exactly the reasons that you mention.

Toyota, in their wisdom, realised that there was a need to be able to use low range without the automatic application of the CDL and they did eliminate this function on the 200 series.

Hope this helps.
Regards
Athol
AnswerID: 607184

Follow Up By: RBH - Tuesday, Jan 03, 2017 at 09:04

Tuesday, Jan 03, 2017 at 09:04
Just wanted to clarify this a bit.

Removing the plug on the transfer case is quick and easy, but for some vehicles it isn't the best option.

When low range is selected, as well as engaging the centre diff lock, ABS is also deactivated (in vehicles with ABS) and the auto shift pattern is modified (for automatic vehicles).

So for manual cruisers without ABS, just pull the plug off the transfer case. But if you have an auto and/or ABS and you want to retain the factory settings you need to remove a wire from a transmission relay behind the glovebox - called the Pin 7 mod - just google that and you will find some info. Very quick and easy. It means that when you select low range, the computer thinks everything is normal, except it doesn't engage the CDL - you have control of that from the CDL button just like in high range.

Not sure how relevant that is to Prado's.
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FollowupID: 876892

Reply By: Member - allan t (NT) - Tuesday, Jan 03, 2017 at 08:51

Tuesday, Jan 03, 2017 at 08:51
Tim
Try LCOOL_ they have a good base of all these fixes. the 80 has an extra switch for high range ,all you do is disconnect the low range wire on the center diff, and use the dash switch .
Allan
AnswerID: 607185

Reply By: Crusier 91 - Tuesday, Jan 03, 2017 at 08:53

Tuesday, Jan 03, 2017 at 08:53
From memory there are 2 ways to do this mod. 1st as mentioned above for auto.
I did mine via the terminals hidden behind the side cover on the drivers side footwell.
I didnt need to go under the vehicle due to mine being a manual.
AnswerID: 607186

Reply By: TomH - Tuesday, Jan 03, 2017 at 09:05

Tuesday, Jan 03, 2017 at 09:05
Its called Pin 7 mod
Heres how to find it Join Lcool Takes a day or so to get accepted.
Go into the search function type jdbb into the second box (Author)
Change forum just below that to 100ser
Hit search and it should be the second result.
Or look here but the plug is behind the glovebox in r/h drives
http://www.sleeoffroad.com/technical/tz_cdl_pin7mod.htm

DO NOT DO THE UNDER THE VEHICLE REMOVAL OF THE PLUG AS IT WILL DISABLE ABS IN LATER VEHICLES
AnswerID: 607187

Reply By: Tim F3 - Tuesday, Jan 03, 2017 at 16:02

Tuesday, Jan 03, 2017 at 16:02
Firstly thankyou to each of your replys...

I disconnected the plug as athol advised and it works exactly as he described...great.

Abs still works all is well.

Mine is a 2002 manual factory turbo.

Thankyou all.
AnswerID: 607196

Follow Up By: Malcom M - Wednesday, Jan 04, 2017 at 07:09

Wednesday, Jan 04, 2017 at 07:09
Hope you read RBH's comments re ABS.as that applies to your vehicle?

You have the same model as mine. Strongly suggest you look at the pin 7 mod...
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FollowupID: 876919

Follow Up By: Tim F3 - Wednesday, Jan 04, 2017 at 08:35

Wednesday, Jan 04, 2017 at 08:35
Malcom thankyou for your advice will recheck abs operation as you suggest.
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FollowupID: 876921

Follow Up By: TomH - Wednesday, Jan 04, 2017 at 10:47

Wednesday, Jan 04, 2017 at 10:47
The pin 7 mod is easy, tidy and reversible in a few minutes. No climbing under a dirty car.

Also removing the plug underneath allows water into the contacts on the gearbox side of it which can never be good.
Far better to do it the proper way and know things are going to be fine for an extended time.

Is the recommended way to do it on Lcool and they are supposedly the Gurus on Toyotas
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FollowupID: 876925

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