SC430 Top problems
Pole Position
Joined: Dec 2009
Posts: 3,135
Likes: 276
From: CA - San Diego
So the DTC B2521 points to the roof close limit switch at the A pillar above the right visor. This switch, along with the one on the left side detects when the roof is closed.
It makes sense if this switch has malfunctioned the roof would not close from its open position in the trunk. Part # 84742-24030 (there are two LH and RH) is a $50 part . FIRST you need to verify this is the correct part number for your VIN. Second are you up to taking apart several trim pieces, overhead light assembly, visor assembly just to gain access to the switch with NO GUARANTEE this is the only problem. Because I don’t understand the bent hinge statement at all.
Finally I suspect your dealer used their software to get the quarter windows up into the closed position.
It makes sense if this switch has malfunctioned the roof would not close from its open position in the trunk. Part # 84742-24030 (there are two LH and RH) is a $50 part . FIRST you need to verify this is the correct part number for your VIN. Second are you up to taking apart several trim pieces, overhead light assembly, visor assembly just to gain access to the switch with NO GUARANTEE this is the only problem. Because I don’t understand the bent hinge statement at all.
Finally I suspect your dealer used their software to get the quarter windows up into the closed position.
Last edited by VVTiBob; Feb 7, 2018 at 11:43 AM.
Racer
Joined: Sep 2016
Posts: 1,258
Likes: 198
From: Ca
Thread Starter
Driver School Candidate
Joined: Jul 2017
Posts: 20
Likes: 2
From: CA
So the DTC B2521 points to the roof close limit switch at the A pillar above the right visor. This switch, along with the one on the left side detects when the roof is closed.
It makes sense if this switch has malfunctioned the roof would not close from its open position in the trunk. Part # 84742-24030 (there are two LH and RH) is a $50 part . FIRST you need to verify this is the correct part number for your VIN. Second are you up to taking apart several trim pieces, overhead light assembly, visor assembly just to gain access to the switch with NO GUARANTEE this is the only problem. Because I don’t understand the bent hinge statement at all.
Finally I suspect your dealer used their software to get the quarter windows up into the closed position.
It makes sense if this switch has malfunctioned the roof would not close from its open position in the trunk. Part # 84742-24030 (there are two LH and RH) is a $50 part . FIRST you need to verify this is the correct part number for your VIN. Second are you up to taking apart several trim pieces, overhead light assembly, visor assembly just to gain access to the switch with NO GUARANTEE this is the only problem. Because I don’t understand the bent hinge statement at all.
Finally I suspect your dealer used their software to get the quarter windows up into the closed position.
And yes I think that is how they got the rear windows up as well, but who knows.
Oh boy, here we go!
Pole Position
Joined: Dec 2009
Posts: 3,135
Likes: 276
From: CA - San Diego
One other comment. It’s my understanding DTCs are not stored past a shutdown due to the number of components and ECUs involved with the sliding roof operation. In other words each open and close can generate new DTCs or not if no errors are encountered.
Last comment and should go without saying, ALWAYS disconnect battery before working on any of the electrical components. They are way TO EXPENSIVE to accidentally fry.
Last comment and should go without saying, ALWAYS disconnect battery before working on any of the electrical components. They are way TO EXPENSIVE to accidentally fry.
Last edited by VVTiBob; Feb 8, 2018 at 10:07 AM.
Pole Position
Joined: May 2016
Posts: 3,047
Likes: 626
From: AZ
Yes, this is an important thing to know. Techstream won't store any codes for the roof module. They only show up when you press the open/close button. I think it is part of the self check before the procedure commences.
Pole Position
Joined: May 2016
Posts: 3,047
Likes: 626
From: AZ
As a person who has fixed his top, I can say with confidence, your friend will need a copy of techstream. Do a search in this forum. It is easily accessible and not very expensive. If you have an old computer, you are looking at an investment of $20 or less.
Racer
Joined: Feb 2007
Posts: 1,637
Likes: 60
From: DC
Exactly correct. I remember going to the Lexus dealer with an intermittent problem and working out a deal ($$$) just to get the codes. We had to cycle the top a bunch of times before getting a fault. Then they came out, read the code, and buh-bye!
Thread Starter
Driver School Candidate
Joined: Jul 2017
Posts: 20
Likes: 2
From: CA
Hey everyone, big thanks so much for all of the very helpful posts!
Currently I am just working out who is going to actually help me with this repair as I'm not that good with this kind of work, but I have one great mechanic who is trying to deiced if he will take it on, and then a couple of possible Russian techs who might be able to give some assistance with it as well.
Either way I will definitely report back how things go once I get a bit further along.
Currently I am just working out who is going to actually help me with this repair as I'm not that good with this kind of work, but I have one great mechanic who is trying to deiced if he will take it on, and then a couple of possible Russian techs who might be able to give some assistance with it as well.
Either way I will definitely report back how things go once I get a bit further along.
Pole Position
Joined: May 2016
Posts: 3,047
Likes: 626
From: AZ
If you were to read this post and print out the PDF's Bob included, you could hand them to any potential mechanic and see if they would want to try and tackle the problem.
https://www.clublexus.com/forums/sc4...not-close.html
Pole Position
Joined: Dec 2009
Posts: 3,135
Likes: 276
From: CA - San Diego
No, B2521 is a switch (RH side) for the roof close at the A pillar. But if 2518 does come up during a future roof movement, then that old thread has a couple of PDFs I posted for working on the package tray.
Last edited by VVTiBob; Feb 12, 2018 at 06:23 PM.
Racer
Joined: Feb 2007
Posts: 1,637
Likes: 60
From: DC
For you newbies in the forum -- there was a reason VVTiBob got a huge reception on his return!
Pole Position
Joined: May 2016
Posts: 3,047
Likes: 626
From: AZ
Thanks for the correction Bob. I don't ever want to be the guy who gives out bad information.
I had looked up the code B2521 and it said it was "Roof Close Switch RH Malfunction." One of the causes was the "Slid Roof Limit Switch." So I googled "Lexus Slid Roof Limit Switch" and came up with part number 84742-24090. I put that into the forum search box and came up with your post.
So I assumed the problems were related, but maybe they use the same switch for two things, or the part number is wrong
I had looked up the code B2521 and it said it was "Roof Close Switch RH Malfunction." One of the causes was the "Slid Roof Limit Switch." So I googled "Lexus Slid Roof Limit Switch" and came up with part number 84742-24090. I put that into the forum search box and came up with your post.
So I assumed the problems were related, but maybe they use the same switch for two things, or the part number is wrong
Pole Position
Joined: Dec 2009
Posts: 3,135
Likes: 276
From: CA - San Diego
Well my post’s part number ended in 240(3)0 not (9)0 (package tray switch) as you mentioned. What’s more important is to order the correct part for the VIN of your car. VIN manufacturering dates can make a difference with changes to part lots or revisions.
But the clue in this case was “roof close” which happens at the A pillar. But you’re also right the switches, at both positions, probable “do” the same function sending data to the roof ECU. I’ve also found the search function at Club Lexus tend to be very general with responses especially with partial matches. So it’s best to read the info thoroughly.
But the clue in this case was “roof close” which happens at the A pillar. But you’re also right the switches, at both positions, probable “do” the same function sending data to the roof ECU. I’ve also found the search function at Club Lexus tend to be very general with responses especially with partial matches. So it’s best to read the info thoroughly.