User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 04-16-2017, 01:14 PM #1
PoshSnoop PoshSnoop is offline
Member
 
Join Date: Jan 2015
Location: Seattle Area, WA
Posts: 146
Real Name: Tim
PoshSnoop is on a distinguished road
PoshSnoop PoshSnoop is offline
Member
 
Join Date: Jan 2015
Location: Seattle Area, WA
Posts: 146
Real Name: Tim
PoshSnoop is on a distinguished road
Doors won't lock - write-up

Short story
Doors will unlock, but they wonít lock. The Taiko TB2-100P relay on the body ECU (printed circuit board inside the Driver Side Junction Block) most likely failed. I bought a new Driver Side Junction Block that has a Panasonic relay on the ECU instead of the Taiko. I replaced the junction block (itís plug and play), and now the doors lock and unlock properly. Completed the repair in a lazy hour and 20 minutes.

Long story
My doors quit locking when pressing the lock button on the remote key fob and when pressing the lock switches on the driver and passenger doors. They would unlock, no problem, but locking was right out. Several threads are available on this subject, but this one seems to point out why: Body ECU test bad, or does it?

Specifically, the Taiko TB2-100P relay on the printed circuit board (aka body ECU) inside the drivers side junction block, has been found to fail in body ECUs across Toyota models. The replacement junction blocks are said to contain a Panasonic relay on the body ECU, and indeed I can confirm that my brand new, 2017 (or so) replacement junction block has a:
Panasonic
50810K1 1015 JAPAN
ACTB31N02
relay in the location where my old junction block has a:
TAIKO
TB2-100P
12VDC
0152 20
The Durk wisely and frequently points out that we should do diagnostics on the electrical parts before just buying stuff and plugging it in. Heís right. I thought Iíd actually do the diagnostics, but for reasons I donít want to admit (ok, Iím lazy, stupid, and impatient... there), I didnít. Rather, I relied on believing real hard that the problem was with the Taiko relay. Maybe Iím finding faith. Maybe not. I tried believing real hard that the doors would just start locking again after whacking the junction block, sticking tennis balls in there, etc., but here we are.

So, my inner cheap bastard had me in a headlock for awhile on purchasing the junction block. My options were:
  • Continue locking all 5 doors manually: This is supposed to be a fancy old truck. Manual door locking ainít all that fancy.
  • Get a salvage junction box: Itís a crap shoot. Might find one, might not. Might work, might not. Might work, but not for long. Might have to do it all over again all too soon.
  • Try to find the Panasonic relay and replace the Taiko relay on the existing printed circuit board: Downtime while truckís disabled, unknown time spent trying to find the part and get someone to do the repair (or gear up and learn soldering), unknown cost and time to complete. Might work, might not.
  • Buy an OEM replacement junction box and change it myself: I own the risk if the new part doesnít do the trick. Might work, might not. I could blow $473 and still have to lock doors manually. Then thereís the slicing of the fingers and the smashing of the knuckles...
  • Take it to the Toyota dealer: Electrical parts damage risk is theirs, not mine. If they donít fix, I donít pay. Theyíll probably find a way to do it wrong and mess up other stuff while theyíre at it. Theyíll charge an astonishing amount of money and it will take my beer fund a long time to recover. Iíll have to try to do QA on them before I take delivery. Theyíre unpleasant. I donít like them.
My inner cheap bastard and I agreed on buying and doing the work myself. A grudge lingers.

I confirmed that part number 82730-35320 was right for my 2002 Limited with engine immobilizer, searched it in Google shopping, sorted by price, and picked the cheapest seller that looked like they might be reputable. Itís best to enter your VIN in the parts catalog to get a big green check mark before ordering, since vendors tend to refuse returns on electrical components. My part was this one, and ended up costing me ~$473 in 2017. https://toyotaparts.bochtoyotasouth....ock-8273035320

The Toyota service manual does not have a specific procedure for replacing the junction block. I was curious to know if there would be any reprogramming after replacing, but it seems not. It took me about an hour and 20 minutes while chatting with a neighbor, cleaning panels before reassembly, realizing I was out of beer, etc. I did this:
  • disconnect ground cable from battery
  • remove screws holding gas door and hood latches
  • remove 4 10mm bolts holding dash panel
  • unclip electrical connections and remove cabin temperature sensor hose from dash panel stuff
  • put dash panel in back seat
  • remove long door sill panel Ė 4 phillips head screws, pull straight up until clips release
  • remove kick panel Ė pull toward back of truck to separate from clips
  • remove engine immobilizer wiring harness keeper clip, then remove harness plugs (2)
  • bend left side dashboard panel to get to 10mm bolt holding upper left of junction block. Remove 10mm bolt holding bottom of junction block.
  • Curse at an appropriate volume while wrestling the 39 (or 78, idk) plugs out of the back of the junction box. A couple of them require that you outsmart them by looking at the new junction box to see whatís keeping them stuck. After you know what to do, they slide right out.
  • Yank out various other relays that are plugged into the box
  • reverse course using new box
  • connect ground battery cable
  • fire up to make sure the engine is not immobilized and test all body controls
  • test drive to scare up more beer and type furiously for a bit
  • done
__________________
2002 T4R Limited 4WD | 159,103 mi | heated seats!
PoshSnoop is offline   Reply With QuoteReply With Quote
Old 07-03-2023, 02:14 PM #2
lschwarcz lschwarcz is offline
Junior Member
 
Join Date: Jul 2023
Location: Hillsboro, OR
Posts: 1
lschwarcz is on a distinguished road
lschwarcz lschwarcz is offline
Junior Member
 
Join Date: Jul 2023
Location: Hillsboro, OR
Posts: 1
lschwarcz is on a distinguished road
Quote:
Originally Posted by PoshSnoop View Post

The replacement junction blocks are said to contain a Panasonic relay on the body ECU, and indeed I can confirm that my brand new, 2017 (or so) replacement junction block has a:
Panasonic
50810K1 1015 JAPAN
ACTB31N02
New member here and I don't even own a 4Runner! I was helping my neighbor who has an '02 Limited with this same issue.

We got super lucky and found a wrecking yard in the area with one and were able to buy it for $30 and that fixed his issue!

But, I didn't find this thread until after we installed it and I don't know if the replacement has the newer Panasonic or older Taiko relay.

I still have the old junction block and have finally found a seller of the Panasonic ACTB31P02. The ACTB31P02 is black while the ACTB31N02 is white. Other than that I believe they are the same.

When I get the ACTB31P02 in a few weeks I'll try replacing it. I'm thinking it'll take a LOT longer after that to try it out given the difficulty in removing from the car.

If you search on eBay you'll find sellers of the ACTB31P02.

Good luck!
Larry.
lschwarcz is offline   Reply With QuoteReply With Quote
Reply

Tags
box , door , ecu , junction , lock

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Doors will unlock, but won't lock. dman328 3rd gen T4Rs 48 01-02-2019 05:13 PM
Swapping doors - any write ups? MillerPKA 3rd gen T4Rs 6 06-21-2014 09:01 PM
Cannot Lock Doors Galindob 4th Gen T4Rs 4 11-08-2011 11:42 PM
Doors won't lock kai920 3rd gen T4Rs 1 10-23-2011 12:14 PM
So you don't want doors to lock automatically? 310K 3rd gen T4Rs 11 09-27-2010 11:18 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 08:30 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2023 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2023 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2023 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2020