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08-19-2009, 11:12 PM | #235 | |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
Location: NJ
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Quote:
Out of curiosity, based on what you see so far, does it look possible to turn the airbag (and seat belt light/chime) on and off with a toggle switch? Or will we have to rig something using the OEM sensors? |
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08-19-2009, 11:22 PM | #236 | |
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Quote:
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08-20-2009, 12:11 AM | #237 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
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I'm psyched. I have a feeling tomorrow's going to be a good day for this project.
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08-20-2009, 01:59 AM | #238 |
You Guy's deserve an award , soon we can all install sports seats
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08-20-2009, 11:57 AM | #239 |
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I have all four sensors clamped like this:
Airbag 'Off' light and seat belt lights are still lit. Also not reading any voltage on the center wire. |
08-20-2009, 01:58 PM | #240 |
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OK. With ignition power off, try reading resistance between the center wire and either of the outside wires. That will verify if you're actually making a good connection to the wire. You should see 48K ohms between the center and either outside wire.
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08-20-2009, 02:07 PM | #241 |
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Ok. Should I keep the sensor clamped for this exercise? And I assume I'm changing the setting on the multimeter from VDC to ohms?
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08-20-2009, 02:12 PM | #242 |
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Correct on VDC to ohms. Clamping is fine - It won't have any effect on the readings.
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08-20-2009, 02:22 PM | #243 |
Drives: 2009 Yaris Hatchback Join Date: Feb 2009
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Which setting am I putting the multimeter to?
I got a reading each time (center to left and center to right) with the black lead on center and the red on either outside wire but I have a feeling I have the meter on the wrong setting. |
08-20-2009, 02:26 PM | #244 |
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Put the meter on 200K (always go to the next highest above what you are trying to see).
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08-20-2009, 02:45 PM | #245 |
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Ok, with the meter on 200k, black lead in the center, red on either outside wire, I got 4.4 both times. I tried a few times and the numbers kept bouncing around some, but the most consistent (when I held my hands steady) was 4.4.
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08-20-2009, 03:07 PM | #246 |
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OK. So right now your SRS light is off, air bag off is lit, and passenger seat belt is lit?
Try disconnecting the battery for 2 minutes, reconnecting and then measuring the voltage on the center pin to ground. for a really solid ground you might want to pop the passenger kick panel and touch the black lead to the ground bolt there. |
08-20-2009, 03:13 PM | #247 |
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08-20-2009, 03:18 PM | #248 |
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With the SRS, are you still seeing the DTC 32?
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08-20-2009, 03:23 PM | #249 |
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I just checked it. I now have 32, 55, & 56 again.
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08-20-2009, 03:30 PM | #250 |
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You might want to check your resistors. I had trouble with mine not making great contact. I ended up shoving mine in through the wire side so they would fit tighter.
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08-20-2009, 03:31 PM | #251 |
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08-20-2009, 03:32 PM | #252 |
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Here's what I've found with the oscilloscope - Every 100ms the sensors transmit a packet of data. The beginning of the packet is always the same and the latter part varies based on pressure on the sensor.
Here are two sequential data packets from the front right sensor: FR - Weight - Period.JPG Here is one packet with no weight on the sensor: FR - No Weight.JPG Here is one packet with enough weight on the sensor for the airbag light to be lit: FR - Weight.JPG Based on this I can easily build a module to simulate the sensors (and to switch between an empty and occupied seat). |
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