KYfirefighter

I pulled the door lock control relay out and took it apart. i can't find any burnt up pieces on the board. i also found out that the part is specific to a scion XB not on any other scions or toyotas.

invisible21

You probably already tapped into the domelight relay for this, but (at least in an 05) there is a single wire that is red with a white stripe at the top of the fuse box in a 9 pin plug that is a negative trigger for all 4 doors as well as the hatch. Also, if this wasn't the case for the 06 you could still tap into all 4 door wires and the hatch individually and diode isolate them from eachother. Hope this helps if you haven't already got it figured out

Jan06xB

Thanks Invisible21 - the thing that threw me was the two door buttons that I checked were the driver and passenger doors which now I see that the driver door is wired separate from the others duh! SO I didn't think I could trigger off the door and I wanted to try to trigger the rear hatch separate. Also the wiring from each door switch went into the harness and was really hard to trace without knowing where they end up under the dash or in the engine bay - now I know - Thanks!

Jan06xB

It may have just popped and is now shorted without showing any sign of burning. Next step would be to trace the terminal connection that goes to the dome light to the circuit board component that is not a resistor or capacitor (2 lead devices) and look for a 3 lead device which should be the transistor that is shorted and replace it. This is like a crash course in electronics btw. If you can take a few photos of it and post them or email me I could get a better idea as to what I am looking at.

KYfirefighter

Thanks for the help i took some pictures i will upload them later. also i need to know which terminal on the door lock control relay is the one for the nagative out to the domelight i have seen thomas post i diagram with the pin numbers for the connection but not a discription of each pin.

Tomas

The numbers on the schematic refer to the connector and pin number, the pics of the connectors show the connector and pin numbers...

Both are shown in the link above (https://www.scionlife.com/forums/viewtopic.php?t=107795) and are discussed in that topic.

The pics of the controller's gizzard should be interesting.

KYfirefighter

here are the pictures. I need to take better ones of the circuit board.

Tomas

Hmmmmmmm... Complex littled beast, eh? Lots of tiny, tiny parts that wouldn't like 12V at 15A or more zapped across 'em.

If possible a macro shot of both sides of the board - straight on - would be fantastic.

Thanks for the pics so far! :D

Jan06xB

YEAH full frame shot would help - looks like it will probably be a surface mounted transistor and the IC with all the leads is probably a micro controller. Amazing how complicated the stuff is when it doesn't need to be. I actually pulled off the bezel around my speedo today and saw the big blue box - yikes that a lot of stuff to lock some doors and turn on a light. My Geo would at least lock the front doors at 8mph automatically - sort of miss that. And an easier to reach door lock unlock button like right above the inside door handle instead of behind my left shoulder.

KYfirefighter

Ask and you shall Receive...
I kept the images full size to make them easier to see so I am posting links to images instead of putting the in this forum.
Front
http://i42.photobucket.com/albums/e3...r/100_0334.jpg

Back
http://i42.photobucket.com/albums/e3...r/100_0335.jpg

I tried a bunch of thing to get these shots as clear as possible but I ended up going outside in the sun and setting up my tripod and they came out pretty clear.

Sid_xBicious

it doesn't look like something is fried. try if you can urge another xB owner to do a swap just to test it. If found really dead, make friend with someone who knows electronic, and probably check eack component starting with that 2 capacitor.

invisible21

it's hard to tell...but it looks like D18 on the backside (far right) might be fried...D19 also looks kind of beaten up (backside, near the bottom-center of the board).

These could just be dirty, so I'm not sure...you might want to get a multi-meter and check for continuity. Other than that I don't see any obviously burnt leads or traces.

Looking at it a little more, either or both of those diodes could be the problem bc they're both connected directly the connector (not sure if they're inputs or outputs).

Also, I can't believe they charge $425 for that sucker...I mean it is more complicated than a relay but at the volume they make those, they couldn't cost near that much to manufacture!

KYfirefighter

when i looked at the picture it kinda looked that way to me as well but it also liks like it could just be the coating that is in the backside has imperfectons on those two.

KYfirefighter

I think that I am going to buy one at a junkyard and if it doesn't fix my problem I will try to resell it I think a couple of others have burnt thiers up too.

Tomas

OK, There are two parts that are first to be suspect: One of the tiny relays might have welded it's contacts if the dome light was ON when power hit the ground lead, and the other is the component marked "K2018"...

It looks like the relay applies power to the dome light and the other applies the ground that slowly fades away when the relay opens (dims the light).

Here are some slightly re-worked pics...

http://tijil.org/DLC_bottom.jpg
http://tijil.org/DLC_top.jpg
http://tijil.org/DLC_see_thru.jpg

...with the dome light connector pin and circuit traces highlighted.

Hope that helps.

(Looks like it would be a real PITA to try to replace the relay - if one could even find a replacement.)

As I said before, GOOD LUCK!

{oops - bad code - fixed *sigh*}

Sid_xBicious

do you have a rent a car place with rental xB in your place?

Jan06xB

If you have an ohm meter then test the resistance across the suspect diodes on the lowest 1 ohm scale and see if there is low resistance in both directions across the diode. If it is shorted then it is probably bad and keeping the light on. Then the next thing would be to check the transistors T1 and T11 is the big one in the center for shorts to the positive. But you should concentrate on the components that connect to the leads going to the Dome Light and not the door locks which will probably be the higher powered components i.e. T11 as the solenoid in the door locks will take a lot more power than the dome light.

KYfirefighter

thanks for all the help, I think that I will print all this out and let a friend of mine check this stuff mor me. that picture with the two images merged is really cool.

BoughettiXB

So what are the exact options I have in my situation I stated in the previous page? I'm sooo mad I did this to my dome light...

Jan06xB

BoughettiXB - did you perhaps swap the wires connecting to your dome light and the LED bulbs don't work because you have the polarity backwards?? LEDs only light up with DC power applied one way where as the regular incandecent bulb doesn't care.