The factory radio has an anti-theft design that requires you to put in a code one time in order to operate. No point in stealing it if you don't have the code. I'm guessing they use a volatile memory to accomplish this. To prevent you having to put in the code every time the the car is turned off or the fuse is pulled, they power it constantly via an auxiliary (non-fused) circuit. The non-fused circuit powers that internal anti-theft system memory (and probably radio station pre-sets and other internal memory,) apparently requires ~200 mA (holy cow!) of current constantly. Thank you so much for running this down! I have a 2008 Pilot (same wiring as 2006) and this problem has bothered me for years. Now I know!
Love your videos bro. Concise and with full English sentences lol. Need more content for sure. Thanks for putting out the videos and sharing the knowledge
Another way to check which circuit is causing a parasitic draw is by measuring the voltage drop across each fuse rather than pulling them out as on a lot of newer cars removing and re installing a fuse can wake up a module the voltage drop will be in the millivolts. if a fuse reads anything other than 0 volts while the car is completely off then there is current running through that fuse. Ps you may have already known this lol.
This also works, I find that my multimeters give me unreliable results sometimes though. Using this method I once spent hours thinking a circuit had a drain and I was on the wrong circuit. I switched to this method using the ammeter and found the real drain. Could be my equipment, idk, but I default to this test now. You’re right though, it’s a pain re-initializing everything when the battery is hooked back up but on these bigger parasitic draw complaints, more often than not, the battery already died on the customer where the vehicle had zero power, so it all has to be learned anyway.
The factory radio has an anti-theft design that requires you to put in a code one time in order to operate. No point in stealing it if you don't have the code. I'm guessing they use a volatile memory to accomplish this. To prevent you having to put in the code every time the the car is turned off or the fuse is pulled, they power it constantly via an auxiliary (non-fused) circuit. The non-fused circuit powers that internal anti-theft system memory (and probably radio station pre-sets and other internal memory,) apparently requires ~200 mA (holy cow!) of current constantly. Thank you so much for running this down! I have a 2008 Pilot (same wiring as 2006) and this problem has bothered me for years. Now I know!
Love your videos bro. Concise and with full English sentences lol. Need more content for sure. Thanks for putting out the videos and sharing the knowledge
Another way to check which circuit is causing a parasitic draw is by measuring the voltage drop across each fuse rather than pulling them out as on a lot of newer cars removing and re installing a fuse can wake up a module the voltage drop will be in the millivolts. if a fuse reads anything other than 0 volts while the car is completely off then there is current running through that fuse. Ps you may have already known this lol.
This also works, I find that my multimeters give me unreliable results sometimes though. Using this method I once spent hours thinking a circuit had a drain and I was on the wrong circuit. I switched to this method using the ammeter and found the real drain. Could be my equipment, idk, but I default to this test now. You’re right though, it’s a pain re-initializing everything when the battery is hooked back up but on these bigger parasitic draw complaints, more often than not, the battery already died on the customer where the vehicle had zero power, so it all has to be learned anyway.
@@SkillCollectors I'll always confirm if the circuit is causing the draw by pulling the fuse before I move on as well.
Great simple tutorial.. Tx a lot!
Glad it was helpful
If I knew what any of this meant I would know how to do this.
Don't worry, it took me years in the trade to finally get it. This video is geared towards diagnostic technicians.
This was supposed to be a demonstration? Yikes.
It’s a diagnostic process. How can I make it better in a future video?