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12-20-2017, 02:53 AM | #19 | |
Drives: 2009 Yaris, 1994 HiLux Surf Join Date: Nov 2013
Location: Addis Ababa, Ethiopia
Posts: 48
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Quote:
Took measurements at the headlight dimmer switch and there are 2 hot lines that drop to 0V when indicators are being used (black for left and violet for the right). Since they are hot normally, I think I can wire each to a relay and control each side. When blinkers are used the lines fall to 0V,which will open the relay and turn off the DRL characteristics. Then blinkers can blink away like usual. Tamrat,
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12-21-2017, 02:40 AM | #20 |
Drives: Decepticon - Ravage Join Date: Nov 2008
Location: San Francisco
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So then your optimum normal function is turn bulb in DRL function
85 - Turn Signal Wire 86 - 12v source 30 - 12v source 87a - Front turn signal 12v But as you pointed out, you cant cuz hazards wont work. The relay wont open. I guess, also use the hazard wire onto pin 85 then.
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12-21-2017, 02:53 AM | #21 |
Drives: Decepticon - Ravage Join Date: Nov 2008
Location: San Francisco
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If its just using relays then i think this will be it:
You need the pulsed signal in the engine bay to be a constant so it can trigger another relay 85 - Output from above relay 86 - Ground 30 - 12v 87a -Turn signal 12v Now unless the (pulse to constant relay) is sending pixies to the 2nd relay. You will have constant 12v to the front turn signal.
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12-21-2017, 11:19 AM | #22 | |
Drives: 2009 Yaris, 1994 HiLux Surf Join Date: Nov 2013
Location: Addis Ababa, Ethiopia
Posts: 48
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Quote:
Thank you very much for taking your time. This was what I was thinking about in the first place. Running this in MultiSim yields 6V after the pulse-to-steady conversion and it wasn't triggering the relay. So I added an op-amp to boost the voltage to 12V and when I ran the simulation the bulb kept blowing even though it was only getting 12V. I don't know what I'm doing wrong. Maybe my power source, I tried it both with a function generator sending a sqaure wave signal and also a pulsed voltage source. What is your opinion on using the signal from the headlight dimmer switch? The signal is a 12V steady at all times, both for the left and right turn indicators. When you use a turn indicator the voltage drops to 0V. Can't this be used to close a relay at all times except when the indicators are being used?
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12-22-2017, 08:47 PM | #23 |
Drives: Decepticon - Ravage Join Date: Nov 2008
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Add a wire to the hazard switch, black wire to power relay as well so both indicator: left right hazard will trip it.
More thoughts. Maybe one relay that runs the left and another the right. But split the hazards black wire to pin 85 on both relays.
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01-13-2018, 12:23 AM | #24 |
Drives: 2009 Yaris, 1994 HiLux Surf Join Date: Nov 2013
Location: Addis Ababa, Ethiopia
Posts: 48
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Left this idea alone for some time because I was focusing on school. Back at it now.
I have 3 12V SPST normally open relays now. Genuine second hand DENSO ones. Planning to wire the whole thing today. But I have one big question. I am basically adding a circuit on top of the OEM wiring. The circuit is more or less isolated from the OEM wiring and will not interfere in any way. I'm just tapping into factory wires to get signals. I don't have to worry about feeding the OEM circuit with current except at the point where I tap into the bulb wires. Do I really need to be concerned about backfeeding (to the flasher unit relay in this case)? Or are these cars clever enough to deal with that on their own?
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01-15-2018, 07:10 AM | #25 |
Drives: 2009 Yaris, 1994 HiLux Surf Join Date: Nov 2013
Location: Addis Ababa, Ethiopia
Posts: 48
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Hey guys, I planned to install the system by now and test it but as it turned out, I completely forgot about the hazards in my circuit. Now I have built another one. Can anyone comment on it?
(More info on the attached pic than the one below)
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01-19-2018, 09:19 AM | #26 | |
Drives: 2009 Yaris, 1994 HiLux Surf Join Date: Nov 2013
Location: Addis Ababa, Ethiopia
Posts: 48
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Quote:
Here is the wiring diagram and component specs: The 6600uF capacitor holds plenty enough charge to keep the relay energized for about 1.6 seconds. This duration is long enough when compared to the period of the pulses from the indicator light wires. I'll have already started installing the system. I have laid out wires and where every thing goes. I just need waterproof containers for the circuits and also a switch that will fit one of the empty slots around the AUX port. And its a bummer that the Yaris doesn't have a gromet in the driver's side (LHD). I had to pull it though the passenger side. I'll put up pictures once I'm done. Tamrat,
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09-11-2023, 12:45 AM | #27 |
Drives: 07 Sedan (AT) Join Date: Jun 2020
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