My parents have a 2000 Lexus RX300. About 6 months ago it developed a parasitic drain that would completely drain the battery if it sat for a few days. I tested the current draw for all the fuses under the hood and found the DOME fuse was consistently drawing about 0.5 amps with the doors closed and the interior lights off. I removed the DOME fuse and the battery has maintained its charge after sitting for several weeks. Odd thing is that when I removed the DOME fuse, we lost power to the radio and the center information panel. I don't know why the radio and information panel would be effected by the DOME circuit. Is there a component that would interconnect the radio/information center to the Dome circuit? Thanks, Gilbert
I just purchased a 2004 GX470 about a month ago. It has the Marc Levinson sound system with navigation, cassette radio unit with a multi-disc player in the glove box. When you push the Audio button the nav screen, all the screen says is "Audio Off" with no audio coming from the radio. When my lights are on at night, I noticed the radio unit itself is not illuminated which makes me believe I have a power issue possibly to the radio unit. After some research, I did come across the Service manual for the radio ( http://www.clublexus.com/forums/att...-toyota_kex-m8527-kex-m8727_servicemanual.pdf ).
If I put in a destination in the navigation, you can hear the audible instructions. If you push the other buttons on the nav screen, you can hear an audible tone at the press of the button. However, when you push the audio button, it just gives you the message "audio off". I brought a multimeter home from work the other night to check the power coming through the wiring harnesses and from what I could tell, I am not getting any power. (***Side note - I know enough to be dangerous but I do not claim to be a technician by any means and most of my information is from some engineering friends and YouTube...). I referenced the various pin positions in the radio service manual to know which ones to check. I also checked with the vehicle key turned to ACC mode and then also checked with the engine running. Both times, it didn't appear that I had any power coming through to the radio unit. I also checked the fuses and they all seemed to be fine.
I called one of the local car audio shops here in town that I received a good recommendation from and he basically said good luck and they wouldn't touch it with being OEM and knowing all the issues that the Marc Levinson system has had.
Has anyone else seen this issue? Any ideas on where the power would actually be coming from that feeds the radio head unit? The wire schematic is included on the service manual but it's tough to make heads or tails of it.
Thanks in advance for any responses.
By Harley Rider
‘05 GX with 147k miles, owned since new. Mark Levinson audio worked fine when I parked it three days ago. Now, it comes on for less than 1 Second, then shuts off. No sound on radio, CD, or tape (yes, the ‘05 still has a cassette deck). Turn the key off, then back on, audio comes on for less than 1 second, then quits again. Shut the GX off for an hour, same thing on start up. Nav screen works fine and all on-screen audio info shows up fine. Nav voice commands come through loud and clear. Searched the forum and can’t find anything.
Any ideas before I spend $$$ at Lexus?