02-27-2022, 05:28 PM
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#76
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So this is the Stop Lamp Circuit for your 4Runner, I'm looking over the thread and pondering some other things to test in the mean time.
SL.pdf
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02-27-2022, 07:17 PM
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#77
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and, looked around the rear brake area (which had been replaced last June). don't see anything abnormal. maybe not, but the brake fluid looked a little below minimum. i'll pick up a pint tomorrow and see. i'll fill it closer to the max line.
perplexing so far. hate to cough up the dough, but might have to pay for a shop diagnostic.
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02-27-2022, 07:41 PM
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#78
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So... looking at the circuit again I'm trying to figure out where you're getting power for the brake lights if it's not being switched on by the brake switch.
Have you tried pulling just the Stop fuse and seeing if it your issue still occurs?
Another fuse worth pulling and checking to see if the issue changes is the Tail fuse as it does seem to be wired into this circuit for when the headlights are on.
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02-27-2022, 07:45 PM
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#79
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Man, been away for a bit, looks like everything I thought of on this has been done. Including the tow harness ( no exposed wires or female connections touching) and plunger adjustment. Looks like you checked the wires, volt tested and ohm checked them with no luck.
My only last thing I can think of off hand is, are there any ties from the brake switch to the ECU? It is a last resort if there is and including everything else has been checked and verified to be in working order. Will it be cheaper than pay for hours of diagnostics, probably not, i don’t know.
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02-27-2022, 08:34 PM
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#80
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also, revisited the under hood fuse box. swapped in another identical relay from another location. brake lights still running. so, i suppose the original relay was OK. if the relay is good, and the switch is good, and no other electrical issues are apparent, what is the next set of suggestions?
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02-27-2022, 09:02 PM
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#81
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Quote:
Originally Posted by rwh963
also, revisited the under hood fuse box. swapped in another identical relay from another location. brake lights still running. so, i suppose the original relay was OK. if the relay is good, and the switch is good, and no other electrical issues are apparent, what is the next set of suggestions?
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Check for bad wires and open grounds. Loose over spread female terminals.
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02-27-2022, 09:34 PM
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#82
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Quote:
Originally Posted by Jakeepoo3
Check for bad wires and open grounds. Loose over spread female terminals.
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been keeping my eye open for animal damage, discolorations, loose stuff, etc. i'm gonna check the terminals on the brake switch plug (i did change the switch at 200k, maybe something happened). everything looks normal in the fuse box.
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02-27-2022, 10:05 PM
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#83
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Quote:
Originally Posted by rwh963
been keeping my eye open for animal damage, discolorations, loose stuff, etc. i'm gonna check the terminals on the brake switch plug (i did change the switch at 200k, maybe something happened). everything looks normal in the fuse box.
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That's a good idea. Hopefully there no rust damage UNDER the relay/fuse box. Also with a test light or multimeter. You can't see the whole circuit.
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02-27-2022, 11:49 PM
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#84
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Quote:
Originally Posted by rwh963
also, revisited the under hood fuse box. swapped in another identical relay from another location. brake lights still running. so, i suppose the original relay was OK. if the relay is good, and the switch is good, and no other electrical issues are apparent, what is the next set of suggestions?
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Did you pull the Tail fuse and stop fuse individually to see if there might be voltage leaking into the circuit somewhere else? (Start with the Stop fuse first, then reinstall it and pull the tail one)
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02-28-2022, 05:19 PM
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#85
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Quote:
Originally Posted by BlackWorksInc
Did you pull the Tail fuse and stop fuse individually to see if there might be voltage leaking into the circuit somewhere else? (Start with the Stop fuse first, then reinstall it and pull the tail one)
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not sure. i'll revisit that later. did you mean the STOP relay?
picked up some brake fluid and moved the level closer to MAX. no effect. was thinking while driving, when do VSC/TRAC lights come on? when you are engaged in heavy braking on loose surface? is there some sensor that is malfunctioning that is thinking i'm in a situation like that? i'm not feeling any braking occurring while driving (like ABS). maybe need a computer re-flash?
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02-28-2022, 11:02 PM
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#86
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Quote:
Originally Posted by rwh963
not sure. i'll revisit that later. did you mean the STOP relay?
picked up some brake fluid and moved the level closer to MAX. no effect. was thinking while driving, when do VSC/TRAC lights come on? when you are engaged in heavy braking on loose surface? is there some sensor that is malfunctioning that is thinking i'm in a situation like that? i'm not feeling any braking occurring while driving (like ABS). maybe need a computer re-flash?
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You likely have some DTCs stored from the diagnostic steps you took. More than likely codes for the stop lamp relay, the stop lamp switch, etc. You can reset the vehicle by disconnecting the battery for about 5-10minutes. In some rare cases you may have to do a zero point calibration (not as common on the '05+ 4Runners, the '03~'04 vehicles had slightly different ABS modules that seemed to forget ZPC if you looked at them wrong. lol)
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03-01-2022, 02:12 AM
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#87
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I've been following along with your issue for a while. I think you need to revisit the trailer tow plug and/or wiring. I mean like really inspect it for any signs of contacts touching inside the plug but especially inspect it for any signs of water intrusion and/or corrosion. Especially the back side of the plug where the factory harness plugs into it - very common to get water in there. Unplug it and see if the issue is the same. Work your way forward from that plug. I would pull the 30 amp trailer power (trailer battery) fuse and see if that changes anything.
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03-01-2022, 08:54 AM
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#88
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Quote:
Originally Posted by rwh963
not sure. i'll revisit that later. did you mean the STOP relay?
picked up some brake fluid and moved the level closer to MAX. no effect. was thinking while driving, when do VSC/TRAC lights come on? when you are engaged in heavy braking on loose surface? is there some sensor that is malfunctioning that is thinking i'm in a situation like that? i'm not feeling any braking occurring while driving (like ABS). maybe need a computer re-flash?
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The ABS light comes on when brake fluid is out of range not the VSC. The stop lamp switch is an input to the skid control ECU once again.. causing the light and deactivation of your abs related functions. That system activates when one or more of your tires are skidding or spinning out. Have you checked the grounds in the circuit at least?? Sh!t can tend to operate backwards with key on/off with an open ground. You can't just guess and ask people what their experience is or you'll never fix it. You're beginning to overthink and question circuits not even involved.. You need to get a test light and multimeter out partner before someone smashes your ass end 😬
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03-01-2022, 07:55 PM
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#89
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tried the battery disconnect, didn't accomplish anything except screw up the clock! gonna be neat my local toyota dealer tomorrow, so will probably stop by and ask around the service dept. came hurt (except my pride!).
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03-01-2022, 08:24 PM
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#90
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Quote:
Originally Posted by rwh963
tried the battery disconnect, didn't accomplish anything except screw up the clock! gonna be neat my local toyota dealer tomorrow, so will probably stop by and ask around the service dept. came hurt (except my pride!).
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Why would disconnecting the battery do anything??? That just clears codes at least a few of them. They instantly come back if you didn't fix the problem.. if your using the dealer at least go in acting like you know what you're talking about so you don't get f_cked. I would put a $20 bet on an open ground or loose fuse or relay feminine terminal. You said you replaced the stop switch at 200k. I'm not sure with your year where that ground is located but did you reconnect the ground?
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