Hello,

I hope someone can help me fairly quickly with my issue. Yesterday I took apart the center console, the panelling under and to the right of the steering wheel, and all the molding around the radio and navigation screen. I did this because I am replacing the touch screen. I did not have time finish the project so it is all still taken apart. When I drove my car I realized that the gauge cluster does not light up, none of the gauges are operational, my turn signals do not work, my sunroof does not work, and my power windows and mirrors do not work. Is there a wire harness or pigtail I may have bumped and not realized?

I thought maybe some of these functions were routed through the radio or nav unit in the dash so even though all the molding is not put back, I plugged in all the electrical components and I still have all the same symptoms.

What are the possible issues? I first thought a fuse, but I find it hard to believe that all those electrical components are on the same circuit.

-Randy

 

randy,
i have the same problem i was missing around with my radio yesterday and everything you described has happened to me. i checked all the fuses and non are blown. i been doing research and found some forms saying that it might be the multiplex, but there are 3 of them and they are not cheap..
when i first unlock the car and get in it my gauges and message screen work but i soon as i turn the key everything goes dead..

someone please help us..

 

This is scary! Did you guys have the negative disconnected from the battery while working on the radio/nav? I recall reading someone else having a similar issue trying to change the light bulbs for the climate control. Pretty sure he had to replace a component (may have been the multiplexer you mentioned). Sorry I'm not any help but I'm in to see what you guys find.

 

i always disconnect the negative but this time my dumb ass forgot. does anyone know the locations of the multiplexer? im pretty sure i fried one of them, now i just gotta find the location of them.. this really sucks i cant roll down my windows, the heat is on full blast, no turn signals and i cant tell how fast im going!!!! i was taking the radio and dash apart so i could start modding everything for the ipad mini install but i guess I'm fixing this problem first. FAIL!!!

 

sgodoy05, your symptoms are identical to mine, and like a dumbass I also forgot to remove the negative cable from the battery...

 

btw, I have access to identifix, so I'll find out where those modules are located.

 

shapiror06, cool let me know what you find, im pulling my hair out trying to figure this out..thank you

 

I had an extremely unusual issue as a result of water intrusion in my 02 Accord V6 a few years back, and in my research I did see some people with really strange issues caused by damaged multiplex units. On that particular Accord there was 2, driver and passenger, attached to the fuseboxes. They were square blue boxes that snap into the fusebox. They are probably tricky to locate and remove, but they are easy to open. Some people did report visible damage. On that car they weren't impossible to locate cheap used, and I happen to have a small stack of them laying around. However, they appear to be exceedingly model and year specific, so its probably of no help there.

If you don't have any other real leads, and are considering replacing the multiplexers, you can open them up and see if they are visually damaged. If so, that's a damn solid sign something is wrong with that unit. If not, it's a bit less determinate.

 

See if this helps. I'll try to take mine out tomorrow (WITH THE NEGATIVE CABLE REMOVED lol) and check them for damage.

 

Zomgvtek, thanx bro Im Gonna Try This In The Morning

 

Lol Same Here Bro Thanx

 

quick google search - micu is only available w/ the main fuse box

 

i just went out to my car but confused as hell.. i have no idea what I'm looking for.. i didnt see any blue boxes, might be different on the tl. on the drawing i think it shows the micu on the back of the fuse box? am i right?

 

This is what they look like on the Accord.





They're probably on the back of fuseboxes.

 

looks like it will be part number 38200-SEP-A03. any acura dealer should stock it because there is an open recall on the part. the old part number is, 38200-SEP-A03. it's a little pricey. around $180.

 

sgodoy05 - the MICU is definitely the issue, there are 3 of them, and they can ONLY be replaced as an entire under-dash fuse box. The newest revision P/N is 38200-SEP-A03. I have a wholesale account at my local dealer so I'm going to get one ordered tomorrow, it should be in stock for the recall. I've attached to this post the replacement instructions, hope this helps!

I'll post my results when I get it installed.

 

thanx for all the help shapiror06 and everyone else, i guess ill order one too.. im gonna call my local acura dealer tomorrow and see if they have one in stock.

 

299.99 at the local dealer!!!! i guess ill be ordering it online.. damnnnn

 

ouch.. mine was 225 w/my wholesale discount

 

Did They Have It In Stock?

 

No but I paid for it and it should be in tomorrow.

 

Please Keep Me Updated Randy... Thank You

 

will do! I just called the dealer to verify when it is coming in. they said tomorrow, or Wednesday at the latest.

 

Have You removed the old Fuse Box Yet? Just Took My Out What A Pain in The Ass.. Good Luck

 

not yet.. my new one didn't come in today and I have to be able to drive the car in the meantime. I will tomorrow evening.

 

here are some pics..
theres a yellow srs clip that kicked my ass..(push and pull at the same time)
the clips on the back were a pain as well!!

 

hope this helps some

 

thanks! it's a lot bigger than I expected it to be. it baffles me that as large as that thing is, that they could not have designed it make those multiplex units replaceable.

 

The MICU is built into the under-dash fuse box. It's a PAIN IN THE ASS to replace. I should know - I had to do it when I fried the turn signal circuit trying to install my side-view cameras.

You not only have to take apart all the screws to get the MICU loose, but you have to take apart every single electrical connector, FRONT AND BACK. The back part is the hardest.

Unless you have freakishly small hands or a miracle tool, take it to the dealer to replace the MICU. I was quoted $50 to replace it at the Acura dealer.

 

What year/model do you have? My dealer told me the MICU for my 2005 TL was available ONLY as a complete fuse box assembly. You cannot get the MICU by itself.

 

i tried taking my apart last night, i couldnt even get it open without breaking it. looks like alot of circuit boards inside.

 

Install went smoothly. You're right though, taking the old one out was a pain in the butt. But the install of the new unit was fairly easy. I removed both battery cables, took out the old one, installed the new one, reconnected the battery cables, then when I tarter it up all was fixed! Hope you get yours back up and running soon!

 

Sweet Bro Glad to Hear That!! Ill Keep U Posted Thanx Again For All The Help