Looking at seats... - Page 5 - Toyota Yaris Forums

MGargano · 08-07-2009, 09:41 PM

Quote:

Originally Posted by CTScott

Did you disconnect the battery while you were unplugging the airbag, etc? If not, disconnect it for a couple of minutes and then reconnect it to reset the SRS ECU.

Yes, I disconnected the battery before I did anything.

MGargano · 08-07-2009, 09:44 PM

The only thing that seems to be working correctly is the driver's side seat belt. Driver's SRS light is on, passenger's side seat belt is blinking whether the belt is inserted or not, and the passenger's airbag light says 'off'

CTScott · 08-07-2009, 09:57 PM

Quote:

Originally Posted by MGargano

The only thing that seems to be working correctly is the driver's side seat belt. Driver's SRS light is on, passenger's side seat belt is blinking whether the belt is inserted or not, and the passenger's airbag light says 'off'

OK. We can find out why SRS isn't happy by jumpering CG to TC on the OBDII connector, and then turning the ignition to the on position. After about 60 seconds the SRS will flash in a pattern. The codes are two digits and multiple ones may be shown.

For example, a 31 will be: flash, flash, flash, pause, flash, long pause

There will be a 2.5 second pause in between each, and then a 4 second pause before the pattern repeats.

Here are the pins to jump on the OBD connector:

OBD- SRS.jpg

MGargano · 08-07-2009, 10:19 PM

Ok looks like possibly 32 (flash flash flash pause flash flash), 55, & 56... Hope that makes some sense

CTScott · 08-07-2009, 10:43 PM

32 is Occupant Classification System Malfunction

55 is Driver side squib circuit issue

56 is Passenger side squib circuit issue

After you shut off the ignition and removed the jumper the DTC's may have been cleared. With the jumper removed, turn the ignition back to on and see if the SRS light is still on.

With the seat belt, did you reconnect the 4 position connector that was next to the airbag connector?

MGargano · 08-07-2009, 10:49 PM

Quote:

Originally Posted by CTScott

32 is Occupant Classification System Malfunction

55 is Driver side squib circuit issue

56 is Passenger side squib circuit issue

After you shut off the ignition and removed the jumper the DTC's may have been cleared. With the jumper removed, turn the ignition back to on and see if the SRS light is still on.

With the seat belt, did you reconnect the 4 position connector that was next to the airbag connector?

All lights are still lit after removing the jumper. And yes, the only things not connected are the 4 weight sensors.

CTScott · 08-07-2009, 10:57 PM

OK. Can you either measure one of the 3 ohm resistors with an ohm meter, or just give me the colors of the stripes to make sure that they are correct?

MGargano · 08-07-2009, 11:03 PM

How's this?

MGargano · 08-07-2009, 11:04 PM

I pushed one end of the wire into each of the pins of the yellow SRS connector, with the resistor in the middle

CTScott · 08-07-2009, 11:19 PM

OK. There's one problem. That resistor is not 3 ohms, it's 3.3 Mega Ohms (which looks like an open circuit). A 3 ohm resistor will be: orange, black, gold, silver or gold

MGargano · 08-07-2009, 11:26 PM

Goddamn it! I swear you can't trust anyone these days! The store I got them from sold them loose, not in a package, so I took their word that they were 3 ohms. I even specified not 3k or 3m!

Well at least that's one problem solved!

CTScott · 08-07-2009, 11:36 PM

Yeah, that will fix codes 55 and 56.

For the 32, do you have enough 10K resistors (4 more) to replace the 470's with 10K's? That would move us to the middle of the sensor range, instead of off to one end, like we currently have it.

MGargano · 08-07-2009, 11:38 PM

Quote:

Originally Posted by CTScott

Yeah, that will fix codes 55 and 56.

For the 32, do you have enough 10K resistors (4 more) to replace the 470's with 10K's? That would move us to the middle of the sensor range, instead of off to one end, like we currently have it.

I don't have more, but they're easily available at the Crap Shack. You want me to replace all the resistors in the pressure sensor pins with 10k? So a total of 8 10k's and no 470's?

CTScott · 08-07-2009, 11:43 PM

Quote:

Originally Posted by MGargano

I don't have more, but they're easily available at the Crap Shack. You want me to replace all the resistors in the pressure sensor pins with 10k? So a total of 8 10k's and no 470's?

I was going to have you try that if you had them laying around. Let me go probe my still-installed sensors and I'll give you a better answer...

MGargano · 08-07-2009, 11:47 PM

Quote:

Originally Posted by CTScott

I was going to have you try that if you had them laying around. Let me go probe my still-installed sensors and I'll give you a better answer...

Ok, sounds good. I won't be able to fool around with this again until Sunday anyway.

BTW- Through all this I totally forgot to ask- what is the expected outcome? Will I have OEM airbag function (minus, obviously, the side airbags in the old seats)?

CTScott · 08-08-2009, 12:14 AM

OK. I just probed mine - I see 3.94 volts on each of the SIG lines with the seat empty, ~4.00 volts with me sitting on the seat (and I weigh about 155 lbs), and ~4.20 volts when I put all of my weight on the corner being measured.

Based on that we should flip your 10K and 470 ohm resistors to make the passenger airbag active. To make it inactive, we are probably looking at increasing the 470 ohm to about 2.5K to 3K.

When you have a chance, measure the voltage of one of your connectors from pin 2 to pin 3 for me. Also measure Pin 1 to Pin 3.

MGargano · 08-08-2009, 12:39 AM

Quote:

Originally Posted by CTScott

Based on that we should flip your 10K and 470 ohm resistors to make the passenger airbag active. To make it inactive, we are probably looking at increasing the 470 ohm to about 2.5K to 3K.

When you have a chance, measure the voltage of one of your connectors from pin 2 to pin 3 for me. Also measure Pin 1 to Pin 3.

Ok, so I should run 10k from 1-2 and 470 from 2-3? That should keep the passenger's airbag active all the time?

MGargano · 08-08-2009, 12:41 AM

Oops... I meant I should change it to 470 from 1-2 and 10k from 2-3, right? I currently have it set with 10k from 1-2 and 470 from 2-3

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08-07-2009, 09:44 PM	#2
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	The only thing that seems to be working correctly is the driver's side seat belt. Driver's SRS light is on, passenger's side seat belt is blinking whether the belt is inserted or not, and the passenger's airbag light says 'off'

08-07-2009, 10:19 PM	#4
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	Ok looks like possibly 32 (flash flash flash pause flash flash), 55, & 56... Hope that makes some sense

08-07-2009, 10:43 PM	#5
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	32 is Occupant Classification System Malfunction 55 is Driver side squib circuit issue 56 is Passenger side squib circuit issue After you shut off the ignition and removed the jumper the DTC's may have been cleared. With the jumper removed, turn the ignition back to on and see if the SRS light is still on. With the seat belt, did you reconnect the 4 position connector that was next to the airbag connector?

08-07-2009, 10:57 PM	#7
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	OK. Can you either measure one of the 3 ohm resistors with an ohm meter, or just give me the colors of the stripes to make sure that they are correct?

08-07-2009, 11:03 PM	#8
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	How's this?

08-07-2009, 11:04 PM	#9
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	I pushed one end of the wire into each of the pins of the yellow SRS connector, with the resistor in the middle

08-07-2009, 11:19 PM	#10
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	OK. There's one problem. That resistor is not 3 ohms, it's 3.3 Mega Ohms (which looks like an open circuit). A 3 ohm resistor will be: orange, black, gold, silver or gold

08-07-2009, 11:26 PM	#11
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	Goddamn it! I swear you can't trust anyone these days! The store I got them from sold them loose, not in a package, so I took their word that they were 3 ohms. I even specified not 3k or 3m! Well at least that's one problem solved!

08-07-2009, 11:36 PM	#12
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Yeah, that will fix codes 55 and 56. For the 32, do you have enough 10K resistors (4 more) to replace the 470's with 10K's? That would move us to the middle of the sensor range, instead of off to one end, like we currently have it.

08-08-2009, 12:14 AM	#16
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	OK. I just probed mine - I see 3.94 volts on each of the SIG lines with the seat empty, ~4.00 volts with me sitting on the seat (and I weigh about 155 lbs), and ~4.20 volts when I put all of my weight on the corner being measured. Based on that we should flip your 10K and 470 ohm resistors to make the passenger airbag active. To make it inactive, we are probably looking at increasing the 470 ohm to about 2.5K to 3K. When you have a chance, measure the voltage of one of your connectors from pin 2 to pin 3 for me. Also measure Pin 1 to Pin 3.

08-08-2009, 12:41 AM	#18
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	Oops... I meant I should change it to 470 from 1-2 and 10k from 2-3, right? I currently have it set with 10k from 1-2 and 470 from 2-3