Radio and LCD display turn on by themselves - Drive Accord Honda Forums
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post #1 of 18 Old 12-31-2010, 01:12 PM Thread Starter
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Radio and LCD display turn on by themselves

Hi there,

I have a 04 Accord LX 4 cylinder sedan. It has 120K. The battery is 6 month old. Recently I found the factory radio and LCD display turn on by themselves, when the car is parked and locked without car key inside.

I tried to turn off the radio when I turn off the car. But it didn't help. The radio still turns on by itself. I found that if I change the volume to zero, then the radio stays off. But LCD display turns on and off by itself every few seconds with backlit. Both radio and LCD operate normally when I drive.

Can someone tell me what is the problem? How to fix it? Any input is highly appreciated.

Thanks,
Kevin
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post #2 of 18 Old 01-03-2011, 11:42 PM Thread Starter
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Any input?

There is apparently a more serious circuit problem. I garaged the car for 5 days around Christmas. After that I couldn't start it, the battery is drained. I don't believe the LCD back lit can drain the battery that quickly.

I had to recharge the battery. Any pointer on how to go about fixing it? Thanks.
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post #3 of 18 Old 01-04-2011, 08:20 PM Thread Starter
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Thanks. Will stop by Autozone this weekend.
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You have a short somewhere.

If you have an Advance Auto or Auto Zone near you, they have a computer thingy that will hook into your car and diagnose the problem, for free.
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post #4 of 18 Old 01-15-2011, 02:20 PM
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freeflight,

Did you find a solution? I have noticed the same problem with the radio turning on and the screen flashing after I turn off my '07 Accord. I did not drive for 2 days and found my battery had drained so I needed a jump start.

I tried changing the battery but this did not stop the radio from turning on. Next I pulled the fuse for the radio so my radio no longer works, but the battery has also not drained again.
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post #5 of 18 Old 02-01-2011, 11:35 PM Thread Starter
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Hi CivilMA,

I haven't got a chance to fix it. After some research, I found this is a common problem with Accord.

In your case, the radio is clearly the culprit. What works for me is
1. turn the volume to zero
2. turn off the radio
Although the LCD backlit display still flashes, this keeps the radio off. LCD alone doesn't drain battery that fast. I can start the car without trouble after parked it for three days.

Hope this helps.

Kevin
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freeflight,

Did you find a solution? I have noticed the same problem with the radio turning on and the screen flashing after I turn off my '07 Accord. I did not drive for 2 days and found my battery had drained so I needed a jump start.

I tried changing the battery but this did not stop the radio from turning on. Next I pulled the fuse for the radio so my radio no longer works, but the battery has also not drained again.
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post #6 of 18 Old 02-02-2011, 02:18 AM
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Do you have any aftermarket mods? If so, they could have caused a short somewhere that affects your radio. It's possible two melted or uninsulated wires are touching each other. Just a thought.

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post #7 of 18 Old 02-05-2011, 10:14 PM Thread Starter
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Do you have any aftermarket mods? If so, they could have caused a short somewhere that affects your radio. It's possible two melted or uninsulated wires are touching each other. Just a thought.
No mods what so ever. Will do a check when I got a chance.
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post #8 of 18 Old 02-05-2011, 10:33 PM
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Yeah that's just plain odd since the radio shouldn't be getting any power to itself other than the security system installed into the radio.

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post #9 of 18 Old 02-07-2011, 03:40 PM Thread Starter
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Yeah that's just plain odd since the radio shouldn't be getting any power to itself other than the security system installed into the radio.
I did some search on the Internet. It seems to be a relatively common problem with Accord. The problem is likely with the radio itself. Dealer's fix is to replace the factory radio for about $500+
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post #10 of 18 Old 02-07-2011, 05:52 PM
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I bought the car brand new and nothing has been added. Would an aftermarket radio solve the problem? I think I could get an aftermarket sterio for less than $500.
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post #11 of 18 Old 02-08-2011, 07:15 AM
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Yeah for $500 i'd go aftermarket than replace.
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post #12 of 18 Old 02-08-2011, 08:36 AM
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Quote:
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Yeah that's just plain odd since the radio shouldn't be getting any power to itself other than the security system installed into the radio.

Or did you buy it used and somebody had installed/removed accessories before selling to you?

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post #13 of 18 Old 02-14-2011, 02:28 PM
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I talked to an installer at Best Buy when I was looking at radios. He suggested the problem might be with a relay that gets stuck in the "on" position. Anyone familiar with the wiring or try replacing a relay?
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post #14 of 18 Old 02-15-2011, 01:28 AM
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Hi, some random thoughts, from memory there are no mechanical relays inside the radio, so the only relay he could be talking about would be a relay supplying ACC and IGN +12volts to the radio. However I donít think a separate relay exists for that circuit?

Apart from a 7.5 ampere switched circuit (IGN/ACC), there is also a permanent un-switched + 12v supply to the radio for real-time clock, security and last Radio/CD state etc. As itís appears to be a 10A circuit, I would think that this circuit is likely switched electronically (electronic relay if you like) in the radios and therefore could be the source of the problem.

There would be a number of ways the radio could fail and trigger this fault, without a circuit it would be hard to fix as there is a microprocessor controlling the on/off operation. I have never found a circuit of the internal radio/CD.

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post #15 of 18 Old 05-10-2011, 08:41 PM Thread Starter
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Good info, thanks.
I will take the car to Kragen for a test, see what those guys say about this problem.
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Originally Posted by MikeCz View Post
Hi, some random thoughts, from memory there are no mechanical relays inside the radio, so the only relay he could be talking about would be a relay supplying ACC and IGN +12volts to the radio. However I donít think a separate relay exists for that circuit?

Apart from a 7.5 ampere switched circuit (IGN/ACC), there is also a permanent un-switched + 12v supply to the radio for real-time clock, security and last Radio/CD state etc. As itís appears to be a 10A circuit, I would think that this circuit is likely switched electronically (electronic relay if you like) in the radios and therefore could be the source of the problem.

There would be a number of ways the radio could fail and trigger this fault, without a circuit it would be hard to fix as there is a microprocessor controlling the on/off operation. I have never found a circuit of the internal radio/CD.
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