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Vans & Minivans Toyota Sienna Toyota Sienna Electrical Problems
55 messages, Last post on Oct 19, 2009 at 12:40 PM
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Replying to: sponge1 (Nov 24, 2008 9:48 am) |
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I have a 99 Sienna and the dash board light (the one that illuminates the speedometer, tach, etc.) went out. Also the backlight that illuminates the heating & A/C controls is also out. Makes driving in the dark difficult when you can't see how fast you're going. I've checked the owners manual, and every single small fuse in the vehicle (actually removed each one and looked at it, and put them back). I can't believe it's a bulb that would control both the dash light and heating and A/C controls back light. I've checked both fuse boxes under the hood and the one behind the small change box near the left knee. Thanks!
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Replying to: dylbrena99 (Nov 08, 2008 6:41 pm) |
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Replying to: dylbrena99 (Nov 08, 2008 6:41 pm) This exact same thing happened to me. Ask yourself: did I use the "odometer/trip meter" recently? That little twisty knob under the odometer (for some reason) doubles as a dimmer switch for all of the Indiglo dashboard panel lights (which includes the blue back light on the radio/middle display), although it isn't marked as such and although you already have another dimmer dial to the left of the steering wheel. You might have accidentally twisted the trip meter instead of pushed it and therefore dimmed your display panel and radio backlight to zero. If you do this, the OTHER dimmer switch won't work, which led me to believe it was a fuse or something worse. A mechanic was going to charge me $1600 to replace the power supply unit! So apparently it is not widely known that this happens, even among mechanics, or else my mechanic was going to keep my Sienna for a few days, then walk out to the van, twist the little trip meter clockwise to make the blue lights come back up, and charge me nearly two thousand dollars for the service.  I'll always Google a problem I'm having with my car from now on. I saved a lot of money! 
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Replying to: 01miami (Jul 13, 2008 8:26 am) The ow |
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My problem was that on a 2000 Sienna the dome lights and door locks quit working and the headlights would only come on with the engine running (or maybe key on-don't remember exactly). (Note here--I checked and rechecked fuses. Also my dash clock was working. The clock and dome lights are on the same fuse on the 2000 model.) After rolling this around in my mind for probably a couple of months I realized that these 3 things all had timer functions. The dome and headlights will turn off after a while when unattended and the doors will relock after a time when unlocked with the remote. I figured that they all must intersect somewhere. I'm a pretty good problem solver & I was afraid of what a shop diagnosis of electrical problems could cost so I started asking questions of every mechanic I could find. No one wanted to help except for one friend who was willing to print out a basic wiring diagram. I finally went to a Toyota dealership and asked the shop foreman if I could examine some wiring diagrams. He pulled the book and we looked at the individual diagrams for each of the systems with problems. There was a common element on all 3--the INTEGRATION RELAY. This might more appropriately be called a "relay integration module." This device is 2 linked circuit boards that essentially tell all the relays what to do. On the 2000 model Sienna it is in a (+/-) 2.5" X 1.5" X 5" plastic case mounted on the back side of the fuse block under the dashboard. On some cars it is integrally built into the fuse block but on this car it is a replaceable unit. I learned that there is no way to test this part. Often technicians try to locate an identical part on another car and use it to test the system and see if that’s the problem. I checked with the Parts Department and learned that the new part was about $430! I started looking for a good salvage yard. I found one with the used part in stock for about $100. I went home and pulled and reinstalled the fuse block to see if I could actually do it. I was successful so I drove to the salvage yard and pulled the unit, popped in the replacement part, and suddenly all was right in the world. By the way—it was a good thing I pulled the part out before committing to a replacement. The part number the Toyota place gave me was not the same as on my part. I needed the actual number from my part to match the part at the salvage yard. I hope this helps someone. |
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I have a 01 Sienna with an electrical Gremlin. Power door has a mind of its own, have been unable to get fixed because the dealer can't fix unless it sees the problem, which happens with no rhyme or reason. My issue I would like help with is the dash lights. The light that illuminates the Right side and center of display (speed odometer and fuel gauge) is not illuminated in addition to the Air flow selector in the center console. This makes it difficult at night. The controls all work they are just not illuminated. I looked at the fuses and there does not seem to be one that operates just these 2 lights. Also the cigarette lighter doesn't work either but that is not as much of a concern since I do not smoke.
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2008 Sienna Limited AWD. 9000 miles. Dead. No power to dash, dome lights, head lights or anything. Doesn't "click" with the key. Meter on the battery says it has 12.7 volts. It drove fine just an hour prior to attempting to start it. I measure the 12.7 volts at the main power bar in the fuse box under the hood, so it leaves the battery. There must be a main fuse or relay that delivers it to EVERYWHERE else. I can't find it. Anybody have any clues? BTW, I am in the country of Turkey and can't readily get to the, or any, US dealer where I purchased the car. I am sure it is in warranty, but no help there. Nothing to help me out at the Toyota website either.
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Replying to: eric55 (May 24, 2009 6:17 am)
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