No dash lights PITA
#1
No dash lights PITA
1986 4Runner 22RE Auto
Alright so everything worked fine up until the ole 4runner took a dip in a hole a little too big for it getting water in the passenger side up to the glove box (truck was side ways in the hole so barely any water got into driver side) and now ive lost my dash lights.
started as the 15A TAIL fuse blowing everytime a new one was inserted.
Unplugged the dimmer switch and voila we have tail lights and clearance lights and the fuse stays conjugated but no dash lights obviously
If i plug in the dimmer switch and turn it all the way up the dash lights glow dimly for about 5 seconds then you hear the fuse pop.
ive unplugged the cig lighter, the radio, and alot of different other things on that circuit and it still does the same thing.
Am i dealing with a simple bad dimmer switch or is this something else shorting out and popping the fuse?
Alright so everything worked fine up until the ole 4runner took a dip in a hole a little too big for it getting water in the passenger side up to the glove box (truck was side ways in the hole so barely any water got into driver side) and now ive lost my dash lights.
started as the 15A TAIL fuse blowing everytime a new one was inserted.
Unplugged the dimmer switch and voila we have tail lights and clearance lights and the fuse stays conjugated but no dash lights obviously
If i plug in the dimmer switch and turn it all the way up the dash lights glow dimly for about 5 seconds then you hear the fuse pop.
ive unplugged the cig lighter, the radio, and alot of different other things on that circuit and it still does the same thing.
Am i dealing with a simple bad dimmer switch or is this something else shorting out and popping the fuse?
Last edited by SideSwipe; 11-25-2020 at 06:25 AM.
#2
Please always indicate Model-Year-Engine-Transmission-Trim (put on signature to save everybody time), so we know which schematic to look at... Else we assume it' a Cadillac
Last edited by RAD4Runner; 11-24-2020 at 10:44 PM.
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anndel (11-26-2020)
#3
Last edited by SideSwipe; 11-25-2020 at 07:30 AM.
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RAD4Runner (11-25-2020)
#7
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I doubt it's a bad dimmer switch. If it failed open, you'd have no lights, and if it failed closed, they'd just be full brightness.
The only things on the other side of that dimmer are lights (combination meter, heater switch, hazard switch, cigarette lighter, radio, ). So one of those tiny light bulbs is now shorted.
I don't want to be the bearer of bad news, but if you had water up to the glove box, your ECM, and every wire to the ECM, went swimming. This is not good ....
The only things on the other side of that dimmer are lights (combination meter, heater switch, hazard switch, cigarette lighter, radio, ). So one of those tiny light bulbs is now shorted.
I don't want to be the bearer of bad news, but if you had water up to the glove box, your ECM, and every wire to the ECM, went swimming. This is not good ....
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old87yota (11-26-2020)
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#8
I doubt it's a bad dimmer switch. If it failed open, you'd have no lights, and if it failed closed, they'd just be full brightness.
The only things on the other side of that dimmer are lights (combination meter, heater switch, hazard switch, cigarette lighter, radio, ). So one of those tiny light bulbs is now shorted.
I don't want to be the bearer of bad news, but if you had water up to the glove box, your ECM, and every wire to the ECM, went swimming. This is not good ....
The only things on the other side of that dimmer are lights (combination meter, heater switch, hazard switch, cigarette lighter, radio, ). So one of those tiny light bulbs is now shorted.
I don't want to be the bearer of bad news, but if you had water up to the glove box, your ECM, and every wire to the ECM, went swimming. This is not good ....
#9
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So you’ve got a short in wiring harness. Old wires have a tendency to crack over time especially if vinyl insulated. I had a similar issue. Turns out it was a trailer light adapter that PO had wired. I had cut plug out and taped up exposed wires. But up behind interior panel insulation was cracked and a little moisture and similar problem as your having.
Tracking down electrical gremlins are always a pain and no easy way to do it. But it can be done. Unplug and remove fuse and check do continuity to ground. Toyota used harnesses that connect to main harness so it’s a doable. Pick an end of the circuit and run it down.
Tracking down electrical gremlins are always a pain and no easy way to do it. But it can be done. Unplug and remove fuse and check do continuity to ground. Toyota used harnesses that connect to main harness so it’s a doable. Pick an end of the circuit and run it down.
#10
getting water in the passenger side up to the glove box
#11
I can take the dash apart in the morning and check for anything funky going on in there but that would be odd to me since water only made it to the passenger side.
I thought about this when i was pulling things off to look for the short then i realized i dont have a glove box light or any wiring for one. no cut out next to latch.
on the dimmer switch connector i have a path to ground on both pins. they both ohm out at like 2 ohms dont know if that means anything.
I thought about this when i was pulling things off to look for the short then i realized i dont have a glove box light or any wiring for one. no cut out next to latch.
on the dimmer switch connector i have a path to ground on both pins. they both ohm out at like 2 ohms dont know if that means anything.
Last edited by SideSwipe; 11-25-2020 at 08:47 PM.
#12
I can take the dash apart in the morning and check for anything funky going on in there but that would be odd to me since water only made it to the passenger side.
I thought about this when i was pulling things off to look for the short then i realized i dont have a glove box light or any wiring for one. no cut out next to latch.
on the dimmer switch connector i have a path to ground on both pins. they both ohm out at like 2 ohms dont know if that means anything.
I thought about this when i was pulling things off to look for the short then i realized i dont have a glove box light or any wiring for one. no cut out next to latch.
on the dimmer switch connector i have a path to ground on both pins. they both ohm out at like 2 ohms dont know if that means anything.
How many pins does dimmer switch have?
Are u measuring connector wired to the dimmer OR connector wired to dash assembly? A picture paints a thousand words.
Just for fun, was water this deep?
https://youtu.be/8xurr79YW98
Last edited by RAD4Runner; 11-25-2020 at 09:37 PM.
#13
Pls put me in your driver's seat.
How many pins does dimmer switch have?
Are u measuring connector wired to the dimmer OR connector wired to dash assembly? A picture paints a thousand words.
Just for fun, was water this deep?
https://youtu.be/8xurr79YW98
How many pins does dimmer switch have?
Are u measuring connector wired to the dimmer OR connector wired to dash assembly? A picture paints a thousand words.
Just for fun, was water this deep?
https://youtu.be/8xurr79YW98
#14
Checked Light Reminder Relay, above ECU? That's why model-year-engine-transmission-TRIM matter.
R/B to T/B 2 ohms while completely disconnected?
T/B = actually white /black. White turned tan from age or heat?
You measure 2ohms from R/B to ground with rheostat disconnected?
If I can access it easily. I'll measure my rheostat, but 2 ohms sounds about right.
Disconnect everything from dash, measure Green Wire on connector R/B.
LOL! Yup. New, $90K trucks could not do that, and the new $30k-$50K 4Runners have less MPG than our 34-YO trucks.
R/B to T/B 2 ohms while completely disconnected?
T/B = actually white /black. White turned tan from age or heat?
You measure 2ohms from R/B to ground with rheostat disconnected?
If I can access it easily. I'll measure my rheostat, but 2 ohms sounds about right.
Disconnect everything from dash, measure Green Wire on connector R/B.
Dimmer connector has 2 pins. Red/black wire and tan/black wire. both have a path to ground. if im reading the wiring diagram right R/B wire should be 12V and the T/B the path to ground. Ohming out the R/B to a nearby ground i get right at 2 ohms of resistance. lol submarine landcruiser
LOL! Yup. New, $90K trucks could not do that, and the new $30k-$50K 4Runners have less MPG than our 34-YO trucks.
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