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I could have sworn I have heard this buzzer when VSC has been activated a few times.
Is this a different buzzer? I might need to run the TS test to make it sound.
I also have heard that buzzer. It is located inside of the instrument cluster - and it is not related to this buzzer. This one is only available on the GX460s that have the PCS.
Have you checked to see if there were different wiring harnesses used in this area with PCS/Radar cruise models? I have a auto high beam rear view mirror that uses a different harness as well as differences if one wants to leverage side cameras in the door mirrors.
I'll see if anything shows up as different in my paper '12 Lexus wiring diagram book this weekend. I am out of town right now.
Looks like connector for buzzer (A9) should be on the same wire run as the Stop Light Control Relay Assembly (A6). I will confirm if this is the case in my official Lexus wiring diagram book as well. If this isn't the case you will likely need to study harnesses for sale from wrecked 460 (so equipped) to see if connector is present there or someone with equipped vehicle will have to trace wiring in theirs.
I also have heard that buzzer. It is located inside of the instrument cluster - and it is not related to this buzzer. This one is only available on the GX460s that have the PCS.
Diagrams in book are the same as electronic. Also that Skid control buzzer sound comes from area directly behind where you can see it placed on diagram as well.
Now that this project is complete I would like to summarize the steps.
This project is not simple. It requires many parts to complete. With these instructions it's possible to do this is one day, but you will need to have all of the parts ready to go. I am not sure how this process will differ with 2012+ GX460s. It can be done cheaply if one has access to a wrecked GX with ACC/PCS, but these are very rare.
PARTS LIST:
1. ADD Radar Cruise Millimeter Wave Sensor (various part numbers depending on year) 88210-60100 ~1500
2. REPLACE Steering wheel controls for Radar Cruise 84250-60210-C0 ~100
3. ADD Driving Support Computer 88150-60030 ~100
4. ADD Seat Belt Control ECU 89810-60020 ~100
5. REPLACE both front seat belts with PCS compatible ones 73220-60530-C0 and 73210-60790-C0 ~600 6. REPLACE Brake Master Cylinder Solenoid47217-60111 (NOT SURE IF YOU NEED TO DO THIS, BUT YOU LIKELY DO, LOTS OF WORK) ~800
7. ADD PCS switch 84770-50010 ~30
8. ADD SKID CONTROL BUZZER 86652-50010 ~5
9. REPLACE Front Emblem with Radar Compatible 53141-48050 ~30
Total Spent: $3,265
I did all of the work myself.
As for the location of the SKID CONTROL BUZZER
Here is the difference between the two Brake Master Cylinder Solenoids (nothing obviously different, must be all in the computer inside) Prior to being ripped out The metal looks the same between the two. The computers may be different? No Brake Master Cylinder
I wanted to post a 2 month follow up from this project.
Radar Cruise and Pre-Collision are working like a charm. There is no unintended consequence from this modification. Long drives are just so much easier now. I am very happy to have finished this project.
Amazing project. Not for my league. But I am interested to know how well the ACC does work in general. It’s one feature I have really enjoyed in other vehicles and if I get another GX I think I’d want it. Does it have false stops? do you tow?
09-19-19, 03:07 PM
