02/2004 RX 300 Audio Fault Martin Levinson system

[BrightonRX300]

so all functions and displays well 

steering control is in place 

AM I MISSING SOMETHING as system turned however if I turn the 

volume knob on centre console its not changing from Zero (0) 

steering wheel volume controls do not respond either 

but mode and chanel change do .

is there a mute or audio fuse or any help welcome 

[cruisermark]

Hi John the amplifier is a weak spot on the Lexus Vehicles - members have reported faults on the LS430 and LS460 before. Sadly I have had this problem - it turned out to be the power supply on the amplifier - I had mine repared by SVT services in Glasgow for £285 inc return postage.

When mine packed up I heard a loud crackle and thats it - all the functions on the screen still worked inc volume counting up but no sound at all.

On the 430 there is afuse for the amp - might be worth looking if this is the case with yours and checking it.

There is a simple diagnostic you can do through the touchscreen for the LS430 - not sure if it will work on your vehicle.

 

[BrightonRX300]

thanks for that . yes got menu up but no improvement sadly 

will look for amplifier fuse 

 

cheers

[BrightonRX300]

thought to delve deeper as i was removing rear trim anyway 

simple task to pull out the lot located AMP in rear boot space 

awkward to access unless you break it down patiently 

took me an hour fortunately i have the space and tools 

although i am NOT a mechanic .

passenger side fuse not blown need to check others

some pics attached 

[BrightonRX300]

I looked on the ClubLexus usa  site and did the following ..

removed all Amp + Radio fuses front engine and passenger side .

disconected Battery and waited 5 mins .RESULT 

Well well i now have the Volume working but no sound so where as before the audio control stayed at zero 

i now have the full range volume control up to 58..

But still no sound from any speaker NOT EVEN A Crackle or Hiss 

HELP  

LOL

[Mr Vlad]

Blimey you've been busy and well done to you stripping all that down. If the controls are working then I'd think the amp is at fault. If possible try a different amp just to test. Even a 2 channel amp will test if sound comes out.

[BrightonRX300]

Good thinking and I do believe 

I have one somewhere will have to route through my kit in the morning in the garage