Navigation Speed Sensor Bypass
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Driver School Candidate
Joined: Aug 2002
Posts: 48
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From: Minneapolis
Navigation Speed Sensor Bypass
I got the information on is300.net. Didn't know if anyone here would be interested in knowing this.
http://www.is300.net/forum/viewtopic...194&highlight=
I did the mod this morning. It works great. It allows you to input addresses and waypoints while the car is moving. I bought a 3 dollar rocker switch and that was about all it took. I mounted the switch under the armrest on my IS300.
http://www.is300.net/forum/viewtopic...194&highlight=
I did the mod this morning. It works great. It allows you to input addresses and waypoints while the car is moving. I bought a 3 dollar rocker switch and that was about all it took. I mounted the switch under the armrest on my IS300.
Lead Lap
Joined: Mar 2001
Posts: 537
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From: Washington
Thanks for the pointer. I'm going to do this mod for my LS430, but with a twist. I'm going to trigger a timer ($15 http://www.hobbytron.net/UK197.html) for 30 seconds to 1 minute every time the 'Destination' button is pressed. No hole to be drilled to mount a new switch.
Last edited by LS007; Feb 14, 2003 at 09:06 AM.
Thread Starter
Driver School Candidate
Joined: Aug 2002
Posts: 48
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From: Minneapolis
The timer does sound like a good idea for an LS. Unfortunatly it takes quite a bit longer to input addresses in a IS300 due to the lack of touchscreen capabilities. You could probalby put in an address in a minute, but I don't think I could. (the IS is run with a toggle joystick, you have to scroll through the letters and numbers and hit enter for each one.) Then once the timer goes out, you would loose signal and would either have to stop the car or hit the "destination" button, which would erase the data you were inputing. I do notice that if you leave the bypass button on the nav goes all goofy and looses the correct position. It's really weird and hard to explain without seeing it. If you have timer set too long you won't like the way it acts. Either way, good luck!
Lexus Test Driver
Joined: Oct 2001
Posts: 1,015
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From: New York
would these be the same wires for an rx. also why cant u leave the switch permantly switched on. in reading the other forums threads, they say funky things start to happen. like what??? why does the ecu need to know the car is moving?
Lead Lap
Joined: Mar 2001
Posts: 537
Likes: 0
From: Washington
The timer is adjustable up to 5 minutes, so it would also work with the IS navigation where the input time would be longer. With a timer it's always assured to go back to 'normal' speed pulse input. Have you noticed that your location needs to be recalibrated after disconnecting the speed pulse wire several times?
To hook the timer in you simply intercept the speed pulse wire with the common and normally closed relay contacts (provided on the PCB of the kit). The tricky part would be understanding how the navigations 'Destination' button is wired and how to integrated the kits push button in parallel. I suspect the destination button contacts between GND or a low + voltage.
To hook the timer in you simply intercept the speed pulse wire with the common and normally closed relay contacts (provided on the PCB of the kit). The tricky part would be understanding how the navigations 'Destination' button is wired and how to integrated the kits push button in parallel. I suspect the destination button contacts between GND or a low + voltage.
Lead Lap
Joined: Mar 2001
Posts: 537
Likes: 0
From: Washington
Well it's done. I've bypassed my speed pulse wire for the navigation system in my LS430. It was real tricky getting the timer wired into the existing Destination and Map/Voice buttons. Now I have approx. 3 minutes of destination input every time the Destination button is pressed (signaled with a green LED behind the top multi-function display) then the navigaiton returns to normal. If you ever press the Map/Voice button it stops the timer immediatly. In the LS both the Destination and Map/Voice buttons have 2 sets of contacts on the PCB for the conductive circles in the rubber pad to make contact. I ended up using one set of contacts for start button (Destination) and another set for the stop button (Map/Voice) of the 555 timer circuit. The speed pulse wire is simply then interupted by the timers relay.
To those at home, don't open up your navigation display. It's a puzzle of interlocking PCB's.
To those at home, don't open up your navigation display. It's a puzzle of interlocking PCB's.
Last edited by LS007; Sep 27, 2002 at 11:58 PM.
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Thread Starter
Driver School Candidate
Joined: Aug 2002
Posts: 48
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From: Minneapolis
Originally posted by VideoNavi
Well it's done. I've bypassed my speed pulse wire for the navigation system in my LS430. It was real tricky getting the timer wired into the existing Destination and Map/Voice buttons. Now I have approx. 3 minutes of destination input every time the Destination button is pressed (signaled with a green LED behind the top multi-function display) then the navigaiton returns to normal. If you ever press the Map/Voice button it stops the timer immediatly. In the LS both the Destination and Map/Voice buttons have 2 sets of contacts on the PCB for the conductive circles in the rubber pad to make contact. I ended up using one set of contacts for start button (Destination) and another set for the stop button (Map/Voice) of the 555 timer circuit. The speed pulse wire is simply then interupted by the timers relay.
To those at home, don't open up your navigation display. It's a puzzle of interlocking PCB's.
Well it's done. I've bypassed my speed pulse wire for the navigation system in my LS430. It was real tricky getting the timer wired into the existing Destination and Map/Voice buttons. Now I have approx. 3 minutes of destination input every time the Destination button is pressed (signaled with a green LED behind the top multi-function display) then the navigaiton returns to normal. If you ever press the Map/Voice button it stops the timer immediatly. In the LS both the Destination and Map/Voice buttons have 2 sets of contacts on the PCB for the conductive circles in the rubber pad to make contact. I ended up using one set of contacts for start button (Destination) and another set for the stop button (Map/Voice) of the 555 timer circuit. The speed pulse wire is simply then interupted by the timers relay.
To those at home, don't open up your navigation display. It's a puzzle of interlocking PCB's.
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Driver School Candidate
Joined: Sep 2002
Posts: 36
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From: NC
Is it fairly easy to find the wire in an LS430? I'd like to try adding a bypass switch, but I don't want to start disassembling things. I tried that with a walkman a long time ago and never did get it all back together again!
I read the detailed instructions for the IS car, but the wires are in different locations on my LS, so they don't help much.
Thanks for any help,
Sean
I read the detailed instructions for the IS car, but the wires are in different locations on my LS, so they don't help much.
Thanks for any help,
Sean
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