96 LS400 drivers seat headrest motor/sensor
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96 LS400 drivers seat headrest motor/sensor
when i connect my headrest in the back of the seat, the ECU seems to get confused & won't allow any motor to move
i assume it is the sensor feeding bad data
anyone tackled this problem?
mark
i assume it is the sensor feeding bad data
anyone tackled this problem?
mark
#2
Colin
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it is the sensor that is bad (motor was always plugged in)
i did the diagnostic check as per the manual & the sensor output is always 12V
i move the the motor to both ends & the DVM never waivers measuring the output of the sensor (i could get the scope out to see if the pulses are there, but since the DVM never changes i am assuming i just have a steady 12V)
is it possible to repair the sensor or is it something i can replace?
mark
i did the diagnostic check as per the manual & the sensor output is always 12V
i move the the motor to both ends & the DVM never waivers measuring the output of the sensor (i could get the scope out to see if the pulses are there, but since the DVM never changes i am assuming i just have a steady 12V)
is it possible to repair the sensor or is it something i can replace?
mark
#4
it is the sensor that is bad (motor was always plugged in)
i did the diagnostic check as per the manual & the sensor output is always 12V
i move the the motor to both ends & the DVM never waivers measuring the output of the sensor (i could get the scope out to see if the pulses are there, but since the DVM never changes i am assuming i just have a steady 12V)
is it possible to repair the sensor or is it something i can replace?
mark
i did the diagnostic check as per the manual & the sensor output is always 12V
i move the the motor to both ends & the DVM never waivers measuring the output of the sensor (i could get the scope out to see if the pulses are there, but since the DVM never changes i am assuming i just have a steady 12V)
is it possible to repair the sensor or is it something i can replace?
mark
ColinWhoHasNotDIagnosedThisCircuit . . . EVER
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i have the sensor in my hand - a small circuit board with a transistor on the back side that must sense the shaft turning, and a couple caps & a small IC
it looks like the transistor switches 1 of the caps in & out to vary the oscillating freq, but mine isn't oscillating
i touched all the solder connections
so, unless i can get a circuit diagram or a replacement, i think my headrest stays where it is
mark
it looks like the transistor switches 1 of the caps in & out to vary the oscillating freq, but mine isn't oscillating
i touched all the solder connections
so, unless i can get a circuit diagram or a replacement, i think my headrest stays where it is
mark
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LS - 1st and 2nd Gen (1990-2000)
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12-03-14 03:15 AM