I bought a Honda Accord iBooster Gen 2 - Now what?

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I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

I was having some difficulties with my Honda CR-V iBooster Gen 1 cause I had no idea what I was getting myself into, so I decided to do the right thing, and go out and buy a Gen 2 iBooster out of a wrecked Honda Accord. [wonder what caused the wreck? maybe bad brakes!]



TABLE OF CONTENTS

Shopping List:
  • BOSCH iBooster
  • Master Cylinder
  • Remote Reservoir
  • Brake Pedal Assembly
  • Unfortunately no wire pigtails
this one I sourced locally from a mom and pop wrecking yard for a wad of cash ($250 maybe)

follow along and together we'll learn more about it and have a few laffs

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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

According to Scripture

iBooster GEN2 car donor list
  • Honda Accord
  • Tesla Model 3
  • Tesla Model Y
  • Renault Zoe (2018+)
Honda Accord Wiki.jpg
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »



rotten.jpg
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by MattsAwesomeStuff »

"Luckily this kit comes with these adapters"

holds up two rotten 2x4 offcuts

Ahh, good stuff.

I'm now scared of trying my Gen1 after yours crapped the bed.

Fluttering and pulsating seems to be an electrical problem :/
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

MattsAwesomeStuff wrote: Thu Nov 24, 2022 8:50 am "Luckily this kit comes with these adapters"

holds up two rotten 2x4 offcuts

Ahh, good stuff.

I'm now scared of trying my Gen1 after yours crapped the bed.

Fluttering and pulsating seems to be an electrical problem :/
lol, yeah, not to hijack this thread but judging by the condition of the Gen 1 MC (master cylinder) my buddy and I assume that donor vehicle may have suffered a flood, so stay tuned for an iBooster autopsy (let's just say a Dremel may be involved)
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

Gen 2 iBooster in the wild

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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Zapatero »

Just fyi: i have this in my Subaru Impreza conversion. The plug you can buy in the link below, works perfectly well, and all the can code for the Accord ibooster you can find in the code on GitHub of openpilot.

https://www.evcreate.nl/shop/brakes-whe ... ector-kit/
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

Zapatero wrote: Fri Nov 25, 2022 3:08 pm Just fyi: i hasn't this in my Subaru Impreza conversion. There plug you can buy in the link below, works perfectly well, and all the can code for the Accord ibooster you can find in the code on GitHub of openpilot.

https://www.evcreate.nl/shop/brakes-whe ... ector-kit/
thanks I just bought this kit, Lars did a great job of taking all the guess work out of it, it can really be a pain to identify and track down all the little pins, gaskets, etc.

FYI, junkyard sellers do not wan to cut off pig tails off of the main engine bay wire harness, they say they sell the complete harness to those who have flooded cars
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

this is what the Honda CRV Gen 1 BOSCH iBooster larger plug looks like, I say this for two reasons:
  • 1. it does fit the Gen 2 Honda Accord BOSCH iBooster
  • 2. however I can not confirm if the wire colors are exactly the same
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

Wiring the Tesla iBooster according to Lars

i put the following graphic together to aid in the stare and compare process of Gen1 to Gen2

Gen 1 vs Gen 2 Both Plugs labeled.jpg
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by MattsAwesomeStuff »

Well, I know I can buy it, but it's $140. I paid $55 for my whole brake booster and master cylinder.

I'm way too cheap to pay $140 for a few wires.

If we knew which ones it was, I presume it's far, far, far cheaper to buy the connectors directly. Hell it might be cheaper from a damned dealership.
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

MattsAwesomeStuff wrote: Sat Nov 26, 2022 7:26 am Well, I know I can buy it, but it's $140. I paid $55 for my whole brake booster and master cylinder.

I'm way too cheap to pay $140 for a few wires.

If we knew which ones it was, I presume it's far, far, far cheaper to buy the connectors directly. Hell it might be cheaper from a damned dealership.
I hear you, 26 way BOSCH Connector housing Part # 1928405762


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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Zapatero »

MattsAwesomeStuff wrote: Sat Nov 26, 2022 7:26 am Well, I know I can buy it, but it's $140. I paid $55 for my whole brake booster and master cylinder.

I'm way too cheap to pay $140 for a few wires.

If we knew which ones it was, I presume it's far, far, far cheaper to buy the connectors directly. Hell it might be cheaper from a damned dealership.
You're right, but I see it that way that I'm buying me time not having to put research in it. If it would be listed here by someone what exactly we had to buy, i had done that :D

I'm happy that I've got a functional ibooster for my openpilot car now 8-)
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Zapatero »

I'm not sure if we really know the can messages to get this ibooster to work? I know it works in Failsafe Mode, but it would be awesome for openpilot cases to know how to control it.

Can someone have a look into this, too?
https://github.com/commaai/opendbc/blob ... erated.dbc
Or
https://github.com/commaai/opendbc/blob ... h_2018.dbc


There it says:

BO_ 229 BOSCH_SUPPLEMENTAL_1: 8 XXX
SG_ SET_ME_X04 : 0|8@1+ (1,0) [0|255] "" XXX
SG_ SET_ME_X00 : 8|8@1+ (1,0) [0|255] "" XXX
SG_ SET_ME_X80 : 16|8@1+ (1,0) [0|255] "" XXX
SG_ SET_ME_X10 : 24|8@1+ (1,0) [0|255] "" XXX
SG_ COUNTER : 61|2@0+ (1,0) [0|3] "" XXX
SG_ CHECKSUM : 59|4@0+ (1,0) [0|15] "" XXX

BO_ 232 BRAKE_HOLD: 7 XXX
SG_ XMISSION_SPEED : 7|14@0- (1,0) [1|0] "" XXX
SG_ COMPUTER_BRAKE : 39|16@0+ (1,0) [0|0] "" XXX
SG_ COMPUTER_BRAKE_REQUEST : 29|1@0+ (1,0) [0|0] "" XXX
SG_ COUNTER : 53|2@0+ (1,0) [0|3] "" XXX
SG_ CHECKSUM : 51|4@0+ (1,0) [0|15] "" XXX

Edit: :!:

Observations:

SG_ COMPUTER_BRAKE_REQUEST : 29|1@0+ (1,0) [0|0] "" XXX
Computer brake request is ID 232 decimal, 0xE8 hex, the length is 7 bytes.
Specific brake request message starts at position 29 and is 1 bit long - at this point it's clear that this one can only be 1 or 0...

So let's try this one:
SG_ COMPUTER_BRAKE : 39|16@0+ (1,0) [0|0] "" XXX
Computer brake is also in can ID232 with 7 bytes. The specific message starts at position 39 and is 16 bits long, so two bytes. That's a pretty big value but a serious candidate for controlling the ibooster.


Any thoughts on that?
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by MattsAwesomeStuff »

Zapatero wrote: Sat Nov 26, 2022 4:42 pmI'm not sure if we really know the can messages to get this ibooster to work? I know it works in Failsafe Mode, but it would be awesome for openpilot cases to know how to control it. [...] Any thoughts on that?
Greek to me. However...

https://www.evcreate.nl/ibooster-can-bus/
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

Zapatero wrote: Sat Nov 26, 2022 4:42 pm I'm not sure if we really know the can messages to get this ibooster to work? I know it works in Failsafe Mode, but it would be awesome for openpilot cases to know how to control it.

Can someone have a look into this, too?
https://github.com/commaai/opendbc/blob ... erated.dbc
Or
https://github.com/commaai/opendbc/blob ... h_2018.dbc


There it says:

BO_ 229 BOSCH_SUPPLEMENTAL_1: 8 XXX
SG_ SET_ME_X04 : 0|8@1+ (1,0) [0|255] "" XXX
SG_ SET_ME_X00 : 8|8@1+ (1,0) [0|255] "" XXX
SG_ SET_ME_X80 : 16|8@1+ (1,0) [0|255] "" XXX
SG_ SET_ME_X10 : 24|8@1+ (1,0) [0|255] "" XXX
SG_ COUNTER : 61|2@0+ (1,0) [0|3] "" XXX
SG_ CHECKSUM : 59|4@0+ (1,0) [0|15] "" XXX

BO_ 232 BRAKE_HOLD: 7 XXX
SG_ XMISSION_SPEED : 7|14@0- (1,0) [1|0] "" XXX
SG_ COMPUTER_BRAKE : 39|16@0+ (1,0) [0|0] "" XXX
SG_ COMPUTER_BRAKE_REQUEST : 29|1@0+ (1,0) [0|0] "" XXX
SG_ COUNTER : 53|2@0+ (1,0) [0|3] "" XXX
SG_ CHECKSUM : 51|4@0+ (1,0) [0|15] "" XXX

Edit: :!:

Observations:

SG_ COMPUTER_BRAKE_REQUEST : 29|1@0+ (1,0) [0|0] "" XXX
Computer brake request is ID 232 decimal, 0xE8 hex, the length is 7 bytes.
Specific brake request message starts at position 29 and is 1 bit long - at this point it's clear that this one can only be 1 or 0...

So let's try this one:
SG_ COMPUTER_BRAKE : 39|16@0+ (1,0) [0|0] "" XXX
Computer brake is also in can ID232 with 7 bytes. The specific message starts at position 39 and is 16 bits long, so two bytes. That's a pretty big value but a serious candidate for controlling the ibooster.


Any thoughts on that?
let's just say I know a guy who might know a guy so let me see if I can rope him in (for the record he fingered out how to CAN the Gen 1 so not positive it's the same for this guy)
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

fascinating new video


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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

The Honda Accord master cylinder like 99.9999999987654321% of all master cylinders these days has two outlet ports, so in order to bench bleed it, one must use a Master Cylinder Bleeder Kit, perhaps such as this Dorman 13911 ? ... WRONG !!!

It appears that Mrs. Dorman has quite the sense of humor as she only provides the unsuspected AMAZON shopper with only one of each type of fitting! And the black non see through hoses, are an extra bonus to take a simple task and make it impossible! So we thank her.

DO NOT BUY THIS KIT !

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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

as my old boss used to say: "Don't give us problems, give us solutions"

I give you the proper kit with a pair of every fitting Noah's Ark style, and clear hosers mind you:

Note: the red are Standard thread and the Blue are Metric thread doodads
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

in Part III we do some part 3 stuff


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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by mjc506 »

I like your reservoir. The tapered sides should allow brake fluid to flow at higher speeds, improving braking response :)
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

my Lars's's's iBooster GEN2 connector kit €99,00 (inc. VAT €119,79) the dude even wrote me a lovely note, [what is this? Customer Service???] I shall have it put together in a couple months no problem

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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by MattsAwesomeStuff »

I don't think you accomplished anything bleeding the master cylinder like that. You let air get into it right away again. You probably did okay to keep the seals wet, but not much more.

Trying to think of how you can test it off of the car. With plugs put into the master, you have no ability to tell if the booster is boosting. The way you can tell if it's boosting, is if it's compressing something easier than you could compress it manually. And, at high pressure.

You could attach balloons to the end of tubes on the output, and see if you can inflate the balloons easier with the booster or not, but, it's such small volume of fluid you're moving I don't think you'd notice a difference. Maybe not balloons, maybe just a small air pocket at the end of the hose that you've clamped shut in a vice or vice grips. And even then, probably not.

You could just keep them capped as you did and measure if current's flowing, but that doesn't tell you much other than that it's wasting energy, could still be broken and using power uselessly.

Best way to test it is... when braking? :p

Maybe a hydraulic cylinder or lift or tool, but, that starts to be more work than just hooking up your damned brakes.

...

As to the spacers, I hadn't considered that you'd want the plunger anything other than completely loose at the start. Very quickly after the start is where the master cylinder locks off backflow (else it's not applying pressure). You definitely don't want it hovering in the state where fluid can't return. So, you trying to copy the same distance was probably counter-productive. You don't want it overly loose, but, somewhere right before it starts applying pressure is the right point. If spacers help you determine that, then good.

I didn't steal a brake pedal, just the booster, and my plan was to bolt the booster straight to the firewall. Now I see that's not such a great idea, because I want the correct amount of swing in my pedal, not just an arbitrary hole drilled wherever mechanically fits. Hopefully it's at least in the right ballpark. Would you mind measuring how far the lever arm is, between the center of the pivot and the center of the plunger pin?

In any case, good job, and, you're entitled to use your wife's special fabric scissors for snipping up cardboard and bits of copper wire now.
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

alright I just totally stumbled upon this Tulay's Wire Werks Bosch iBooster Gen-2 Connector Kit by accident whilst trying to Google the first gen BOSCH iBooster pedal sensor


Tulays Wire Werks iBooster Kit.jpg
kit-0003.jpg
ibooster-gen-2-wiring.jpg
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Re: I bought a Honda Accord iBooster Gen 2 - Now what?

Post by Gregski »

now this is more my speed when it comes to building your own tedious wire harness

Tuley's Wire Werks Bosch iBooster Gen-2 Universal Wire Harness


Tulays Wire Werks iBooster Gen 2 Harness.jpg
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