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Old 01-26-2021, 05:24 PM #1
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2002 4Runner 4WD Dashboard Lights only Half Working

Looking for some help on a 2002 4Runner – 319,680 miles – had in 14 years. And it’s been my primary vehicle throughout. A wonderful truck!

Just recently the top 2 lights (wheels) in my 4WD indicator (see picture) in my dash stopped working. 4WD has always worked fine prior.

At first I thought it was maybe an LED… But with lots of further thinking on this… I’m wondering if it’s maybe a switch on the front wheels or something other. My knowledge is lacking in how the 4WD works.

But I’m unable to find further info on this when searching. And to this point I haven’t taken the dash apart to look behind it – though it looks easy enough and I have the ability to readily do it.

Anyone have any good insight or thoughts on the cause?

Thanks,
Jon
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2002 4Runner 4WD Dashboard Lights only Half Working-143257799_3965467136797188_4972154091642335293_n-jpg 
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Old 01-26-2021, 06:01 PM #2
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Quote:
Originally Posted by jonfasch View Post
Looking for some help on a 2002 4Runner – 319,680 miles – had in 14 years. And it’s been my primary vehicle throughout. A wonderful truck!

Just recently the top 2 lights (wheels) in my 4WD indicator (see picture) in my dash stopped working. 4WD has always worked fine prior.

At first I thought it was maybe an LED… But with lots of further thinking on this… I’m wondering if it’s maybe a switch on the front wheels or something other. My knowledge is lacking in how the 4WD works.

But I’m unable to find further info on this when searching. And to this point I haven’t taken the dash apart to look behind it – though it looks easy enough and I have the ability to readily do it.

Anyone have any good insight or thoughts on the cause?

Thanks,
Jon
Try shifting to 4 low and see what happens. If I understand 01-02 4wd system correctly shifting into low range will tell the 4wd computer to engage the front ADD as well. If it lights up correctly then I would suspect the switch is unplugged
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Old 01-26-2021, 08:14 PM #3
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Quote:
Originally Posted by Bad Luck View Post
Try shifting to 4 low and see what happens. If I understand 01-02 4wd system correctly shifting into low range will tell the 4wd computer to engage the front ADD as well. If it lights up correctly then I would suspect the switch is unplugged
I tried shifting to 4 low with no change in lights. Only the bottom 2 greens stayed lit.

I did all the other options... and I now notice that my "Center Differential Lock Switch" has no effect on the 4wd.

This did work prior to my noticing the top two green 4wd lights not working.

This is now more worrisome to me.

Thoughts?
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Old 01-26-2021, 08:33 PM #4
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It must be a bulb issue, it is either off, all flashing, all green or all green with orange centre diff lock.
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Old 01-26-2021, 08:45 PM #5
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Quote:
Originally Posted by Malcolm99 View Post
It must be a bulb issue, it is either off, all flashing, all green or all green with orange centre diff lock.
If a bulb issue - do you know how many bulbs are back there to turn the 4 wheels green?

I would have guessed one bulb to cover the 4 green wheels. As like you stated - I've only seen "either off, all flashing, all green or all green with orange centre diff lock." in the past 4 years.

And when pushing the "Center Differential Lock Switch" switch - I feel no clicking... no anything... like I thought it would do in the past...

If a bulb issue - that would mean both the orange centre diff lock bulb... and the "upper two green wheel" bulb... has burned out within a month of each other. Is there two bulbs there for the 4wd "four wheels"?

Just adding some thoughts for troubleshooting... and seeing what others think...
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Old 01-26-2021, 09:06 PM #6
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I should say bulb or Led issue, there is a bulb that illuminates that area, an I expect there is board contacts for the 4WD indicator with 2 LED's/bulbs to light up the wheels and 1 LED/bulb to light up the centre diff lock, but I'm guessing. If anything isn't working with the 4WD system it will flash telling you one or more position sensors or abs sensors are not satisfied and the system will not engage 4WD
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Old 01-26-2021, 09:32 PM #7
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Thanks for your thoughts.

A bit more info. I have no flashing issues. The 4wd seems to lock in and out fine, just not the two rear wheel lights. and no centre diff lock orange light or locking in of the centre diff lock.

Hopefully others see this and give some thoughts as well.
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Old 01-27-2021, 09:56 AM #8
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Quote:
Originally Posted by jonfasch View Post
I tried shifting to 4 low with no change in lights. Only the bottom 2 greens stayed lit.

I did all the other options... and I now notice that my "Center Differential Lock Switch" has no effect on the 4wd.

This did work prior to my noticing the top two green 4wd lights not working.

This is now more worrisome to me.

Thoughts?
I'm assuming it went into low range? I would start with making sure your switches are connected. If they're connected then try having someone press the switches while you are underneath with your hand on the transfer case actuator to feel if the actuator is moving. This can be done with the key on and engine off.
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Old 01-27-2021, 10:36 AM #9
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Correct - it did shift into the low range. So that worked correctly.

"making sure your switches are connected" - just to make sure I'm looking in the right area - are these the 2 switches right next to each other on the transfer case that you are talking about? I think I saw this referenced in another post when I was looking for help.

I haven't physically looked under the truck yet.
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Old 01-27-2021, 10:43 AM #10
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Quote:
Originally Posted by jonfasch View Post
Correct - it did shift into the low range. So that worked correctly.

"making sure your switches are connected" - just to make sure I'm looking in the right area - are these the 2 switches right next to each other on the transfer case that you are talking about? I think I saw this referenced in another post when I was looking for help.

I haven't physically looked under the truck yet.
Yes. Those are the switches I'm talking about
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Old 01-27-2021, 03:17 PM #11
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Update...

Was out for lunch (Wisconsin), so too cold and snowy to look under the truck till I get home.

But was doing some t/s reading... and as I was coming back to work decided to try a few things.

Another post said to hold the centre diff lock for 2-3 seconds. Hmm, my orange light now lights. I don’t remember having to hold it the switch that long in the past.

But still, only the bottom 2 4WD green lights(wheels) are lit. The two top 4WD lights (wheels) are not light.

I do have to be driving for the orange centre diff lock light to come on…

Question:
Does anyone have a good understanding if the four specific 4WD green lights (wheels) are electrically connected to certain switch solenoids on the transfer case?

And I think I’ve read that there are two more switch solenoids on top of the transfer case that can be accessed below the center console. Is that correct?
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Old 01-27-2021, 05:21 PM #12
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There are 3 bulbs involved with the 4wd indicator. One bulb for the front wheels, one for the rear wheels, and one for the center diff. I don't know of any situation where only 2 wheels would illuminate to indicate some sort of a problem. If there is a problem, all 3 lights will just blink. I would start with pulling the cluster and checking then replacing what you should find to be a dead bulb. If you happen to actually be having 4wd problems as well, troubleshoot those as a separate issue. I've never replaced those bulbs myself, and depending on which thread I look at I'm seeing the bulbs being #24, #74, Neowedge T3, or Neowedge T4. Hopefully someone who has replaced those lights themselves can answer that. My guess is that they are #74 as that is what most of the bulbs in the cluster seem to be. You can find good info on replacing the cluster bulbs here. The picture there does show the 4wd lights in the wrong spot. They are the 3 open spots in the center towards the top of the picture of the back of the cluster in that thread.
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Old 01-27-2021, 06:37 PM #13
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Great Info!!

I have my Saturday task as to pull that instrument cluster... I had looked into it last week... and it looked very doable on my part but I wanted to make sure it made sense! Can't be any harder than changing parts on Fighter Jets in the Air Force... which was in my past for 8 years... :-)

Thanks and I'll get back with an update this weekend!
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Old 01-27-2021, 08:57 PM #14
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The light under the D symbol for drive on my dash is out so I need to do the same thing at some point, just seems like a lot of work just for a single light.
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Old 01-27-2021, 09:17 PM #15
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the missing green lights just bug me... I've been driving it for 14 years... and I miss my two green lights... :-)

Plus if it's only a bulb, than I know it's not another issue that could be much worse.

A good task for a snowy Saturday!
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