Speed sensor for navigation - GS300
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Driver School Candidate
Joined: Jan 2003
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From: California
Speed sensor for navigation - GS300
OK, I've seen various to-do on IS300 & LX430 on how to disable the speed sensor or "brake sensor" so you can utilize the navigation buttons while moving. Does anyone know how to disable this on a GS300??? I would love to see a post with photos or some sort of instruction.
Tech Guru
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From: Texas
there is a speed signal going into the NAV, my nav is not fully working yet, so I can't test it out, i don't see any brake signal going in the nav based on GS schematic, thus, all you need is to disconnect this wire, then your nav won't know if you are moving or not, but no guarranty, I haven't try it yet.
Lexus Champion
Joined: May 2002
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From: Georgia
I did that a while ago on my 01 430 by disconnecting the speed sensor wire and ground the e-brake wire. It's doesn't work. I think I may need to jump speed sensor wire to ground or something else, but I will give it another try.
They're 2 speed sensor wires coming out from the Odometer and then it spice to the Multi Display ( Nav Screen) and another one go to the Nav ECU. I just disconnected the one at the Nav Screen and I don't want to disconnect the one at the Nav ECU because if I do that the Nav ECU don't know my car is moving.
They're 2 speed sensor wires coming out from the Odometer and then it spice to the Multi Display ( Nav Screen) and another one go to the Nav ECU. I just disconnected the one at the Nav Screen and I don't want to disconnect the one at the Nav ECU because if I do that the Nav ECU don't know my car is moving.
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Tech Guru
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From: Texas
"I just disconnected the one at the Nav Screen and I don't want to disconnect the one at the Nav ECU because if I do that the Nav ECU don't know my car is moving."
hey, i didn't know there is an speed signal goin to the nav screen? not on the 98-00 schematic I have. that is weird.
anyway, the signal going into the nav computer is (98-00 model) is: pin 12, color code: violet/white wire.
try to disconnect it then. From my schematic, do NOT try to ground this wire. by the way, my schematic is from the dealer book.
you milage/consumption won't work anymore, but that should be ok
hey, i didn't know there is an speed signal goin to the nav screen? not on the 98-00 schematic I have. that is weird.
anyway, the signal going into the nav computer is (98-00 model) is: pin 12, color code: violet/white wire.
try to disconnect it then. From my schematic, do NOT try to ground this wire. by the way, my schematic is from the dealer book.
you milage/consumption won't work anymore, but that should be ok
Last edited by BananaGS; Feb 22, 2003 at 03:42 PM.
Rookie
Joined: Oct 2001
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From: California
If disconnecting the speed pulse and parking brake wires do not work, the system might still be relying on GPS signals to determine that the car is moving - therefore preventing access to features while driving.
Just a thought.
MMM
Just a thought.
MMM
Originally posted by BananaGS
anyway, the signal going into the nav computer is (98-00 model) is: pin 12, color code: violet/white wire.
try to disconnect it then. From my schematic, do NOT try to ground this wire. by the way, my schematic is from the dealer book.
anyway, the signal going into the nav computer is (98-00 model) is: pin 12, color code: violet/white wire.
try to disconnect it then. From my schematic, do NOT try to ground this wire. by the way, my schematic is from the dealer book.
Tech Guru
Joined: Jun 2001
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From: Texas
There is NO brake switch <period> why everyone keep refering to a brake switch?
with your car running, in D, but stay on the brake (not moving) can you still change the nav? if so there are not brake switch, I don't see any brake signal on the nav schematic anyway.
Bit, yes, in theory, disconnect pin 12, on the nav computer will prevent the computer from knowing that you are moving or not, but that something you have to try out first. The navigation computer still know if you are moving or not based on the nav signal, but I don't think lexus had implemented it to check for both speed and nav signal. if you can wait for a few weeks, then I can try out for you, if not, try it out and let me know. I don't see anyother side effect from removing the wire.
"switch could be inserted in that wire to temporarily allow input while moving. Is that true?" YES, but I would try to remove this wire completely first to see what happen. i don't like the idea of using a switch, but it may work. It may shock the computer when you use a switch, remove the wire is safer.
Anh
with your car running, in D, but stay on the brake (not moving) can you still change the nav? if so there are not brake switch, I don't see any brake signal on the nav schematic anyway.
Bit, yes, in theory, disconnect pin 12, on the nav computer will prevent the computer from knowing that you are moving or not, but that something you have to try out first. The navigation computer still know if you are moving or not based on the nav signal, but I don't think lexus had implemented it to check for both speed and nav signal. if you can wait for a few weeks, then I can try out for you, if not, try it out and let me know. I don't see anyother side effect from removing the wire.
"switch could be inserted in that wire to temporarily allow input while moving. Is that true?" YES, but I would try to remove this wire completely first to see what happen. i don't like the idea of using a switch, but it may work. It may shock the computer when you use a switch, remove the wire is safer.
Anh
Last edited by BananaGS; Feb 22, 2003 at 11:44 PM.
Lexus Test Driver
Joined: Oct 2001
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From: OHIO
Originally posted by BananaGS
speed signal not connected. Full control on the nav while the car is moving. Give it a try, just remove the pin, so you can put back later, don't need to cut anything.
speed signal not connected. Full control on the nav while the car is moving. Give it a try, just remove the pin, so you can put back later, don't need to cut anything.