toyotas and automatic headlight sensor
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=93542
Printed Date: May 12, 2024 at 1:24 AM
Topic: toyotas and automatic headlight sensor
Posted By: accessdenied
Subject: toyotas and automatic headlight sensor
Date Posted: May 02, 2007 at 10:43 AM
Hello All, Can anyone verify if they can get the parking lights to flash on lock/unlock when the Headlight switch is set to automatic with a aftermarket alarm connection on ANY Toyota vehicle? It seems on a Toyota Sienna, the (-) parking light wire connection is bypassed or disabled when the HL switch is set to automatic. No parking light flash at all. But when the HL switch is off, the (-) parking light wire connection is back to normal operation. Whatz the deal with this? Could it be a Toyota factory thing? I think this has something to do with the auto-headlight sensor wire that overides the normal operation of parking light switch/wire to the relay... I will suck, big time, to have to turn off the headlights just to get the park lights to flash.... Anyone have a comment about this? Thanks.
Replies:
Posted By: enice
Date Posted: May 02, 2007 at 11:52 AM
Well when you have the lights on automatic it has constant (-) when the vehicle is turned on. Your output parking light is pulsing (-)to the wire that already has (-), thats why it wont work. Tried with my car with the lights on and realized that gave me the same result. What you can do is probably use your hazards to work with the system instead of the parking lights. Who knows maybe this will also make the corner markers work too....
Posted By: accessdenied
Date Posted: May 02, 2007 at 12:33 PM
Enice... Ahhh... so it's not just the Siennas in question having this parking light issue with auto-headlights. What vehicle do you have? I already thought of wiring the (-) park light output wire from the alarm to the hazards lights circuit BUT that circuit has it's own flasher relay. I will need to test the hazard wire and overall system condition as to what the (-) alarm pulsing would do. The harzard switch is not a simple SPST type switch. More of a combo defroster/hazard connector harness plugged into an electronic (yes with its own circuit board) box housing.... Again, needless to say, I need to test the outcome of the flashing. Also this is where the factory alarm falshers are connected to as well. Another option is converting the (-) pulse to a (+) and directly connecting to the parkling light wire somewhere in the engine (sort of Old School) or if I can the wire AFTER the parking light relay, that would work too... What do yout think? Anyone else with a Toyota that has auto-headlights care to join and find out what yours does too?
Posted By: enice
Date Posted: May 02, 2007 at 4:13 PM
what youcan try to do is to cut the wire and see if it cuts off the parking lights, if it does you can interupt the power with a relay and connect the parking light output from the alarm to the wire that needs (-) to turn the lights on. You would use your ground when remote wire from the alarm and connect it to 85,(+) to 86, 30 to one side of the parking wire and 87a to the other side. Again, only if cutting the wire turns off the parking lights.
Posted By: accessdenied
Date Posted: May 02, 2007 at 4:29 PM
enice, which wire are you reffering to? The auto-headlight sensor wire or the actual parking light wire? Also when you say 'see if it cuts off the parking lights' I will assume your talking about the HL sensor wire when it's already dark outside and the HL/parklight are on/active. If my assumption is correct, I do have a relay already seperating the HL sensor wire when remote started. This is because the Sienna does not power off the HL after a remote start times out or is manully shut off. I do notice that the parking light do flash during remote start but that is because the HL sensor wire is separated already during the RS run time. This would be the same thing as the HL switch is set to off but only during RS. After that, it's back to no parking light flash.
Posted By: enice
Date Posted: May 02, 2007 at 4:40 PM
actually im talking about the parking lights.the GREEN/ black wire. cut it and see if you lose the parking lights when remote started
Posted By: accessdenied
Date Posted: May 02, 2007 at 9:59 PM
enice] wrote:
actually im talking about the parking lights.the GREEN/ black wire. cut it and see if you lose the parking lights when remote started
Ok... Does it matter if the auto-HL switch is off or on?
Have you tried the method you describe above?
Posted By: enice
Date Posted: May 02, 2007 at 10:27 PM
I have a 2004 jeep wrangler, i just had all the lights on and remote started. I did not see it flash like you mentioned. I havent tried it but am assuming that the GREEN/ black wire is having ground when on auto-HL. you could not cut it and just test to see if it has ground when remote started with auto-HL swtich on. If it does then use the relay to interupt it and give your parking light output to the side that would pulse the parking lights.
Posted By: KPierson
Date Posted: May 03, 2007 at 10:58 AM
I think you guys are talking about two different things here. AccessDenied is saying he gets no parking light flashes when he arms and disarms if the switch is in Auto. Entice is saying that when remote started the parking lights come on, so you can't see them flash. It sounds like the best solution is to go directly to the parking lights with 12vdc. I wouldn't really consider that 'old school' as many vehicles still have 12vdc parking light circuits. ------------- Kevin Pierson
Posted By: accessdenied
Date Posted: May 03, 2007 at 11:51 AM
KPierson, yeah it seems enice and I are talking about 2 different scenarios.... The flash fix I'm looking for is independent on whether the vehicle is RS or not. Basic lock/unlock parking light flash when the HL switch is in auto mode just does not work.
Posted By: accessdenied
Date Posted: May 06, 2007 at 8:20 AM
Ok an update:
Worked on this a few hours yesterday and determined there was no choice but to connect to the hazard light wire to see the lock/unlock alarm flashes when set to auto-HL.
The 'After the relay' PL output wire I tested came out to be moot. That wire is grounded at all times. Seems it switches from ground to 12v when the PL relay gets the (-) signal from the HL switch or (-) pulse from the alarm.
After testing the hazard wire, I figured the (-) 1 sec momentary PL lock/unlock pulse from the alarm is good enough because if the pulse was any longer than that, the hazard lights will flash 2x from a 1x pulse. That would suck.
Well at the end, I decided to connect the alarm PL output wire to both the hazard and PL wire on this car. Diodes are used to isolate the hazard and PL circuits. I did this for the remote start PL flashes as well.
Wiring it this way worked out better than expected. The PL wire from the alarm has a steady 2sec 12v output between pulses so the car parking lights just stays lit for the 2sec duration while the hazards flashes 3x, ten pauses and then starts the cycle again. Really looks cool and different. By just looking at the flash scheme, you definitely will know the car is remote started.
Of course, since the PL lights don't work when set to auto-HL, the hazard pulse timing is synchronized with the alarm lock/unlock pulse.
So, this ends my Sunday morning write-up... 
Posted By: KPierson
Date Posted: May 06, 2007 at 9:00 AM
Good to hear you found a suitable solution. As cars get newer and technology gets more advanced installers run in to these issues more and more.
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Kevin Pierson
Posted By: sarcomax
Date Posted: May 08, 2007 at 12:03 PM
I have run into this problem with alarms on the prius, camery, sequoia, sienna... and have had to use the positive wire for parking lights. No problems yet.
Posted By: lamikela1
Date Posted: May 08, 2007 at 12:07 PM
This is a little late but on my '05 Tacoma if I leave my headlight switch on mine will not flash either. The problem is that the body ECU controls this function and inhibits this from happening. The only way to get around this (at least as far as I can tell) is to isolate the circuit so that the ECU does not intefere. This did not bother me so much so I did not go that route. I just remember to turn the switch off. Also, since I have a two-way alarm (Autopage RS-860) my key fob shows the arming status.
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Pioneer AVIC-Z1, JL 8W3V2, XR650CSi, 300/4, 250/1, Bluetooth, XM, A/V switch, Backup Cam, Autopage RS-1000
Posted By: accessdenied
Date Posted: May 08, 2007 at 1:00 PM
sarcomax wrote:
I have run into this problem with alarms on the prius, camery, sequoia, sienna... and have had to use the positive wire for parking lights. No problems yet.
Hey sarcomax,
As I understand it, the (+) PL wire rest at ground at all times.
How did you get around this and why didn't you use the (-) PL wire from the headlight switch harness instead?
Where did you connect the (+) PL wire on the Sienna anyway?
Thanks.
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