Looking at seats... - Toyota Yaris Forums

CTScott · 08-19-2009, 04:56 PM

OK. Now that the SRS is happy, I just did some experimentation with the OCS. The resistors will definitely not work, as there is a signal component as well from the sensor. There is a DC voltage, which is proportional to the weight applied to the sensor, but there is also an analog waveform on the signal pin. When I connected the resistors and power on the ignition, I would see the correct voltage on the signal pin for a couple of seconds, then the voltage would drop to zero and the passenger seat belt light would flash rapidly. Checking the DTC showed a 32. After disconnecting the battery and reconnecting the sensor, the DTC would go away and the OCS would operate normally. Tonight I am going to pull the sensors off of the seat, so I can experiment with one.

MGargano · 08-19-2009, 05:15 PM

Quote:

Originally Posted by CTScott

OK. Now that the SRS is happy, I just did some experimentation with the OCS. The resistors will definitely not work, as there is a signal component as well from the sensor. There is a DC voltage, which is proportional to the weight applied to the sensor, but there is also an analog waveform on the signal pin. When I connected the resistors and power on the ignition, I would see the correct voltage on the signal pin for a couple of seconds, then the voltage would drop to zero and the passenger seat belt light would flash rapidly. Checking the DTC showed a 32. After disconnecting the battery and reconnecting the sensor, the DTC would go away and the OCS would operate normally. Tonight I am going to pull the sensors off of the seat, so I can experiment with one.

I'm glad to hear, again, that it's not just me having problems with this. I look forward to hearing what you discover when you pull the sensors.

CTScott · 08-19-2009, 09:03 PM

I just took the seat apart (which turned out to be a challenge, as my largest torx bit is a T30). I realized that you can separate the seat base from the seat. Doing so provides a great way to mount an aftermarket seat to the four sensors. The silver bolts sticking out of the sensors are the mounting points. It seems like four heavy gauge L brackets or two 16" long pieces of angle iron are all that would be required.

Seat Base.jpg

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08-19-2009, 04:56 PM	#1
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. Now that the SRS is happy, I just did some experimentation with the OCS. The resistors will definitely not work, as there is a signal component as well from the sensor. There is a DC voltage, which is proportional to the weight applied to the sensor, but there is also an analog waveform on the signal pin. When I connected the resistors and power on the ignition, I would see the correct voltage on the signal pin for a couple of seconds, then the voltage would drop to zero and the passenger seat belt light would flash rapidly. Checking the DTC showed a 32. After disconnecting the battery and reconnecting the sensor, the DTC would go away and the OCS would operate normally. Tonight I am going to pull the sensors off of the seat, so I can experiment with one.

08-19-2009, 09:03 PM	#3
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	I just took the seat apart (which turned out to be a challenge, as my largest torx bit is a T30). I realized that you can separate the seat base from the seat. Doing so provides a great way to mount an aftermarket seat to the four sensors. The silver bolts sticking out of the sensors are the mounting points. It seems like four heavy gauge L brackets or two 16" long pieces of angle iron are all that would be required. Seat Base.jpg