Hi,
I've searched for a few hours trying to solve this issue and haven't been able to find anything conclusive. I apologize if this has been discussed before, please feel free to point me to the relevant threads.
I've got a 2003 Honda Pilot and a Pioneer AVIC F90BT. During ignition, my Honda's ACC wire drops to 0 volts for about a second. This drop causes the AVIC to reboot, which can be a major pain if you are on a blue tooth call or don't want to deal with the 30 second reboot time. It's not a problem turning the engine off, just during the crank on startup. I believe the AVIC needs at least 9 volts to keep running.
I've been advised to do a few different things to solve this and wanted to get opinions on which is the best solution.
1. Wire the AVIC's ACC wire to the Pilot's ignition wire which should keep power on at all times while the key is in the ignition.
2. Use a timed relay, similar to the PAC TR7. Maybe in conjunction with another relay?
3. Build a tank switch. Not sure on the exact procedure here, but I'd like to keep the components as small as possible. I just need power for a second or two. If a battery is needed, I'd like to keep it small enough so it can be mounted behind the dash.
4. Follow the
Pulsed to Steady Output instructions. I've tried hacking together 6700 UF worth of capacitors (without the resistor) using the diagram in that link but it doesn't give me the voltage needed. I'm assuming that I don't have large enough capacitors here. Is the resistor needed or should I put a diode in place to keep the capacitor from feeding back to other components?
Are any of these solutions workable? Should I be trying something else? Finally, if the solution is for me to make a circuit, is there already a product available that I can buy off the shelf that would solve this for me? I'd like to minimize the chance of me screwing something up and starting an electrical fire :)
Thanks!
In the diagram, did you install the diode that is in series with the wire labeled, 12V from turn signal? The diagram calls for 10,000 mics worth of capacitor. I do not know long it should stay engaged with only 6700 mic. The ignition wire should also be a good option. The accessory wire dies during start to allow all available power to get to the starter.
No, I didn't add the diode. And I really did hack this part together. I did something similar to
this picture, except I connected two capacitors directly to the relay instead of the one. I wasn't sure which size diode I should use or how to connect it. Should I be using a circuit board to connect the diode to the capacitors?
Oh, forgot to ask, I realize why the accessory wire cuts out, but would circumventing that by wiring the AVIC to the ignition impact the cars starting power in any meaningful way?
The radio pulls so little current, it will not cause problems while starting.
The diode is there to insure that the stored power in the capacitors is only used to keep the relay energized, without it the caps are feeding everything on the acc circuit. I have no idea how much current charging 6700 mics worth of capacitors will require. Just to be safe Radio Shack sells 6 amp diodes. One of those will more than handle the task. The circuit board is up to you. For this application you do not need the resistor that parallels the capacitor. The diode that goes across 85 and 86 can be a 1N400any number 1 to 7.
I just looked at your picture and was actually going to suggest that you do exactly what you did with the capacitors. No need for a circuit board. Like I said the resistor is not needed.
Thanks for the info! I'm going to run down to RS and pick up the diode and see if I can get two 4700 uf capacitors. Maybe that will be enough. If I can't get this to work I'll look into finding the correct ignition wire for the pilot.
Is it ok to wrap the capacitors and relay with electricians tape? I noticed that the relays get a little warm during use.
The capacitors you have should be enough time. The reason it was not enough time was the lack of the diode. The relay does put off a little heat, a few layers of electrical tape should not be an issue.
