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On the Goorunner 1987 4runner 22re automatic, we have no backup lights. So far, all i know is there are single filament bulbs in the sockets and no corrosion in them. Other rear lights work fine. Need to understand where the wiring runs in order to trace it.
It's a pretty short wiring diagram.
Power goes from the 15a fuse to the back up switch on the trans, then to the bulbs. Assuming wires are ok, I'd go after the switch first and test.
On the Goorunner 1987 4runner 22re automatic, we have no backup lights. So far, all i know is there are single filament bulbs in the sockets and no corrosion in them. Other rear lights work fine. Need to understand where the wiring runs in order to trace it.
Unscrew the whole tail light assy from the truck body and check the wire connections.
I had a non-working tail light that the cause was the power wire came free from solder on the backside of the socket.
Easy fix or a good place to start hunting down the problem .
After much troubleshooting, my backup lights are intermittent. Shift to R with ignition on, they don’t work but after a few minutes they will come on and stay on until I shift to park, then they go out and don’t come back on. I removed the NSS and disassembled it to check inside and it looks ok. Cleaned and reinstalled it but no improvement. Ive shaken the harnesses around to look for a short, but found nothing. I’ve disconnected the connectors, inspected for pushed contacts and sprayed with contact cleaner. No improvement.
could someone with a 1987 Toyota service manual post a shot of the backup light circuit schematic? I have a 1986 one but need to confirm wiring colors for 1987.
Finally getting around toTrying more troubleshooting after grocery shopping, squirrel removal from my attic and selecting/erecting a Christmas tree. Armed with meter and 12v test light, but my main problem is not believing/being able to follow this schematic. My 15@ fuse that feeds the lights is fine, everything else fed from that fuse is fine. But the wires i am finding on the trans don’t seem to agree with the schematic. Does anyone have a wiring diagram showing the connectors themselves? And where is this alleged switch located?
When i first responded I should have asked if it was an automatic or manual transmission. My apologies.
Your vehicle will get the back-up light signal off the neutral safety switch, not a sender on the transmission.
there should be 4 wires coming off the neutral safety switch.
Light blue/white stripe and a green going to the ECT computer.
A red one (no stripe) going to the "engine" fuse.
And finally, a red with light blue stripe that is going to your back up lights.
1986 vs 1987 have differences. Some I know, some I discover.
That single red wire in first photo I’d check for power.
something about that grouping of three wires looks odd. I’d have to see 1986 schematic to say for sure, but the way they’re routed, and color, just doesn’t seem correct.
Maybe that neutral switch isn't the original?. That gray looking split loom wrap, along with the wires be in individual sheaths, seems odd.
1986 vs 1987 have differences. Some I know, some I discover.
That single red wire in first photo I’d check for power.
something about that grouping of three wires looks odd. I’d have to see 1986 schematic to say for sure, but the way they’re routed, and color, just doesn’t seem correct.
Maybe that neutral switch isn't the original?. That gray looking split loom wrap, along with the wires be in individual sheaths, seems odd.
I can’t say for a fact that it’s the original transmission, but there’s no record of it being changed in the maintenance information i got from the previous owner. It works surprisingly well for having 300k on it.
I think I’ll take a different tack here. I’ll figure the ckt out on the working 86 manual shift and then compare to the goo runner.
Last edited by Melrose 4r; Dec 4, 2023 at 04:27 AM.
1986 vs 1987 have differences. Some I know, some I discover.
That single red wire in first photo I’d check for power.
something about that grouping of three wires looks odd. I’d have to see 1986 schematic to say for sure, but the way they’re routed, and color, just doesn’t seem correct.
Maybe that neutral switch isn't the original?. That gray looking split loom wrap, along with the wires be in individual sheaths, seems odd.
the rig mel is working on is the 1987 with the auto. should be the same as the schematic.
Toyota's schematics are actually very good. and if you have the EWD there's a plethora of info.
The info you need won't be included in the "back up light" section of the EWD. You need to go to the "ECT" diagram.
The wires for the various shift solenoids are white, black, yellow, and green/red stripe.(84520a,b,c,d,)
It looks like that short loom for the shift solenoids connects under the intake manifold, I'm guessing that lower connector in your last photo.
Now, here's where things could get confusing.
The part labelled 84223 isn't a neutral safety switch. Sure looks like one, put it's a pattern select switch. And this image is from the ECT section of electrical.
The Neutral Safety switch isn't in Switch an Relay.. You gotta go over to ECT to find that. The big clue is the first five numbers of the part number. NSS should be 84540-xxxxx
What's mounted on the right side of the transmission?
I have a feeling your photo is of the position switch(84223) which looks an awful lot like the NSS. This caused mix ups bitd a few times. It would have been helpful in the parts diagram if Toyota had put both in the same diagram. i think your NSS is on the passenger side of the trans.
That one wire, the one you have as red. Could it be green and red?
You might need to clean to tell.
What's mounted on the right side of the transmission?
That one wire, the one you have as red. Could it be green and red?
You might need to clean to tell.
I’ll take a photo of the right side as soon as possible. EWD on the way for $90. The one wire in the photo is definitely solid red.
Finally back on the backup light troubleshooting. I bought the 1987 Truck and 4runner Electrical Wiring Diagram and after spending a while to figue out how to read it, it helped. Here’s what i have learned/confirmed:
The backup lights are intermittent. If i turn the key on and shift to R, after a minute they may come on. If they do come on, they remain on until i shift to another position, then they go out and won’t come back on after shifting to R again. So, with them on, i started probing with my test light to see what makes them go out and where there was 12V in the circuit.
Green A: 12V present when key on.
Green B: 12V present when in R and backup lights are on
Breaking either of these connectors cuts backup lights.
Green C: Pattern Select Switch? Disconnecting it does not cut the backup lights
Blue circle/single red wire: I think this may be the actual backup light switch. Unfortunately it appears to be held in with a 10 or 12mm that i don’t think can be removed without first removing the trans mount.
Last edited by Melrose 4r; Feb 28, 2024 at 05:56 PM.
That part, 84223, in front of the sender circled in blue, isn't the neutral safety switch. 84223 is the Transfer Position Switch for the transfer case.
The Neutral safety switch begin with 84540(-xxxxx)
Being an automatic, it won't have a backup switch on the transmission like the manual, the NSS replaces that. The part you circled in blue is probably the 4wd indicator switch. If you put your vehicle into 4wd the indicator on the instrument cluster should light up. If you unplug that circled switch the light should go off. What color are the two wires, and their stripes?
edit: that circled part isn’t the 4wd indicator switch. Probably a boot covering a shift solenoid connector.
Nov 5, 2023 | 05:02 AM
