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Thread: Diff Lock Info reqd

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    Default Diff Lock Info reqd

    I bought Toyota Prado 3 Door LJ70 a few months back.
    Found that its switch wiring of Diff Lock are disconnected by Pr owner.
    Help reqd how to check that it is functional after I reconnect the wires.
    The photo of switch is

    Diff Lock Info reqd -124177
    Diff Lock Info reqd -124177


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    Default

    I never had a vehicle with this type of Diff Locks but my understanding is that these are electronically controlled locks. The set up of locks are in the Diff/tubes. It is likely that the locking setup would be there and compleelu un tampered. My suggestion is that you contact a good electricion and ask him to check the wiring connections, it will work Inshallah

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    Default

    As said by Saidhi, except if the diffs have been changed...which would be rather unlikely but nevertheless possible as some previous owner may have tried to drive home on a sunny day with the diffs locked

    A simple way to check if the locks work or not is to put one rear tire up on a jack so that its a few inches off the ground. With an open/unlocked axle if yu try to move the car in 2WD you won't make much progress as the jacked tire will spin away while the other one will stay put. If you are able to engage the locker then both the rear tires will spin at the same speed and the vehicle will drive off the jack.

    Here I am assuming that the diff lock buton is for the rear locker only and that the locker works in 2WD (not fully sure on latter). In any case you can figure out a 4WD locking test based on the above to be double sure....
    "If YOU don't believe in what you're doing it'll never work."

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    Default

    This is definitely a factory locker and in my opinion is definitely at the rear.
    From what i know every 4x4 in the early 90's had a factory equipped locker in the highest trim.

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    Default

    @baigaqeel

    Sir kindly confirm what is written on the Diff Knob, I cant read it cuz the pic is not clear. Normally its "OFF", "REAR" and "R/F". Last knob position stands for activating rear as well as the front diffs.

    Sherwan you may also be correct cuz i have seen some london model LCs with rear diffs only. Let Aqeel confirm what are in his LC

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    Default

    Quote Originally Posted by saidhi View Post
    @baigaqeel

    Sherwan you may also be correct cuz i have seen some london model LCs with rear diffs only. Let Aqeel confirm what are in his LC
    I think most JDM models too were with Diff Locks at highest trim.
    E.g Nissan Patrol never ever came with diff locks and sway bar disconnects both electric. While the highest trim of the Nissan Safari had both, one also had the option of diff lock or LSD.

    I picked up this info on a Australian site for Nissan Patrols/Safaris. I'm just forwarding it and i could be wrong on this.

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    Default

    Dear All,
    Sorry for poor photo.
    The switch is OFF-PUSH-RR
    The switch has 2 wires only which are cut right beside the assy & just near them are other 2 wires of same color & size which i think go to the Diff ECU for final control.
    I think the pr guy or his electrician cut off the wires for some unknown reason.
    There is a LED indication also in Panel which lights during Ignition ON & off when Engine starts. & it is normal if there is no malfunction.
    What I am going to do is connect the wires & start the Engine. First put the vehicle in L4 & switch On the DIFF LOCK to RR & see if the light in panel comes on.
    Next step is jack up the rear 2 wheels, start the engine & manually rotate any one rear wheel, if the Diff lock switch is at RR then spinning one wheel should spin the other wheel also & vice versa.
    With switch OFF only one wheel should rotate.
    This is the theory of DIFF LOCK.
    Am I right?

    I am also member of this Forum
    http://www.ih8mud.com/
    it is excellent for TLC's.
    Awaiting response.

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    Question

    There was no factory option for locking axle differentials on the 91 and 92 models. The switch is located to the left of the steering column and is a three positon switch (Off - RR - FR-RR) which allows you to lock just the rear (RR) or the front and the rear (FR-RR). There is no possibility to lock just the front without wiring modifications.
    Diff Lock Info reqd - 44625 10150244473050618 734895617 13899595 6514713 n
    This is what you should look for. Then get under jeep and look at the diffs. You'll see a box on the passenger side of each diff if they're really lockable diffs.

    You'r is equipped with only two position switch for rear locking only, push option is there to avoid going accidently into diff mode on high speed.
    What makes 4x4Engaged? special is to discover secret places others cannot reach! ✓

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    Default

    I had a 5 dr 92 Prado and it had a rear diff only. the button was similar to yours. and when engaged an LED light would go on. Mine also had problem in a sense that the wires were cut from under the vehicle.
    so when i turn the knob the led goes on but diff won't engage. once wires connected it started to work.

    Now to check if its working or not is pretty easy. first of all you can hear a click from rear axle when you turn the knob. if engine is too loud or you can't hear the click then try it on a jack and lift both rear wheels up.
    you can test this without putting the vehicle in gear as this might cause accident with vehicle jumping off the Jack.
    just rotate one rear wheel with open diff and you will notice the other wheel turning in oposite direction. engage the diffs and then when you rotate one wheel both will rotate in the same direction.
    I may get Lost But I don't get stuck!

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    Default

    Dear All,
    As said before I connected the wires & then switched on the Diff Lock , there was a click in Diff ECU which is beside glove aptt, the Diff Lock LED started blinking in console, the rear wheels diff locked & i could feel it when crawling, it was doing so when in H4 & L4 mode only.
    Next I Jacked up the rear wheels & while neutral & in H4, L4 I again switched on the switch & manually rotated the wheels they were as Naomi said.
    Now my question here is
    Is it OK if the LED is blinking, as mechanically I feel the Diff Lock system is working.
    BTW I have put a connector in b/w the two wires so that any one else if driving accidently donot switch it on & mess up the differential.
    Also here is a clean picture as i promised before

    Diff Lock Info reqd -125129
    Also the LED which is blinking when engaged

    Diff Lock Info reqd -125130
    Diff Lock Info reqd -125129 Diff Lock Info reqd -125130

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    You are a lucky man if your diff locks are working, they make such a valuable addition in everything except for mud. Enjoy it! If the light is blinking, just get the electrics checked, in most case a blink means that the diffs are locking, but have not completely locked. That's how it is in my Shogun, not sure about the Prado you have.

    Rao.
    I will miss her, that RKR. She will always be the one that got away.
    But, life goes on. From RKR to MMC. 4x4 Engaged? Team Unimog, Pakistan

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    Blinking diff lock light means the lock has not engaged.. try putting it in gear and driving slowly a couple of yards (STRAIGHT).. the light should turn constant meaning positive diff lock in the rear wheels.. It does the trick usually... if the light still blinks.. its time to get it checked..

    Hope it helps.. oh and also post pics of your ride..

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    Default Problem Resolved

    Dear PW's
    Thanks all for yr valuable advise.
    As Diff Locks were working but light was blinking.
    So checked the wiring,
    found one feedback terminal at harness connector below fuel tank broken. replaced the terminal, also the wire loop in b/w sensor & harness connector OPEN.
    Replaced this loop also.
    Checked the Diff Lock Engagement,
    Now Light is steady & Off when Engaged & Disengaged.

    Aqeel Ahmed

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    Quote Originally Posted by baigaqeel View Post
    Dear PW's
    Thanks all for yr valuable advise.
    As Diff Locks were working but light was blinking.
    So checked the wiring,
    found one feedback terminal at harness connector below fuel tank broken. replaced the terminal, also the wire loop in b/w sensor & harness connector OPEN.
    Replaced this loop also.
    Checked the Diff Lock Engagement,
    Now Light is steady & Off when Engaged & Disengaged.

    Aqeel Ahmed
    congratulations... now go rock crawling
    its all about power to weight ratio...

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    Aqeel, your beast just got better, it will be one hell when other 4x4s get stuck and you just crawl over the obsticle with absolute ease. Now you need to post some pics of your off road experience with diffs

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    Default

    Guys
    Based on the above discussion , the feedback signal to the LED comes from the switch installed on the axle . IF diff lock switch is of the model Off - R - FFRR , then u should have a six cable jack on ur diff locks switch . One for sending power to rear diff. One for getting feeback on engaged position which will turn the LED . One for the reversing of current through a relay . Same sequence is repeated for the FF position but the catch is that reverse diff llock are not affected .

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