Quote:
Originally Posted by toyotaspeed90
Ah, ok, that all makes sense.
I'm thinking a relay might be able to be used to activate the VSVs.
In the AE95 a problem I ran into was one went bad (athose are rare, so not cheap) and I wanted to control 2 VSVs via 2 relays but never got around to it. I could actually just swap vacuum hoses and engage the CDL (at least in that vehicle the switch only controlled the VSVs, if I manually moved the vacuum hoses the light o the 4wd selector (CDL) would light up independent of the switch. I'm guessing the 4runner is slightly more in depth than that.
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I've built a manual trans and auto trans Alltrac Camry... well versed in those VSVs on the car-based AWD systems. The VSV pair is actually very similar on the 4Runner - and can probably be swapped between the cars and 4Runners in a pinch.
The stock SR5 system uses a single multi-pole relay to do the job of switching vacuum for the front diff. All the wiring will be there in your SR5, you just need to use the bits you need.
And I took a look at the diagrams a bit... it looks like all signals of interest might be at the location where the 4WD ECU is, so you might be able to basically replace it with the ADD Relay from your SR5.
I used a '97 4WD SR5 donor 4Runner on my '99 2WD when I did the swap. I only had to run about 6 wires total to get the system to run completely like OEM...
-Charlie
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'99 4Runner SR5 Auto -
4WD swapped
'89 Camry Alltrac LE 3S-GTE 5spd
'17 Chevy Volt Premier
'16 Honda Odyssey Elite
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