My Lexus 2004 RX330 only has sound from the passenger speakers. Balance to left produces no sound. Balance to right produces sound on passenger side only.

Try to remove the speaker and check the pigtail if broken or you can use a tester to check the resistance of the speaker the resistance is printed in the speaker in ohms, common value for this speaker is 4 ohms . if there is no reading the pigtail of the speaker is already damage. good day and best regards.

Hi,
You have to check the FADER setting in the Player. You have to set it at the center as you set the balance. If the fader is at Rare or Frond then there will be sound from the two speakers. You can access the fader setting as you access the balance setting . It will be just before or after balance setting. Also you have to check the speaker connection.
ok

Hi there,
it seems that there is loose wiring if not grounded to your speakers.
I would recommend you check the status of the wires from the amp going to the speakers and make sure that they not rusted and they are intact.
If you can go with rewiring the speakers I think that's the best way to go.
Hope this helps!

Hello there,
There is a problem with the wiring of the speaker, the wire might have been cutted from a point hereby not making there to be sound from the left side.
Please have the wiring checked for any problem, that way you will be able to detect the fault and know the next step in solving it.
Also run a check on the relay switch of the car so you will be sure to know that the problem is not from the switch.
Hope this information helped. Goodluck Elect_Comp

Hi,
Seems the issue is with the cabling or wiring of the speakers check the speaker wirings and make sure all the wirings are in good shape if possible replace the wires to see any changes in the way the speakers produce sound also check the Amplifier if you have one installed.

Just check the wire..it is clear a wiring issue ..It is either from the plugs or the wire itself has a break on ..To be sure just attach a speaker to the left out and see if it has signal ..than re-wire it just to be sure..If you insert another control speaker or anything ..just to see if it has signal ..and nothing gets on the left ..check the settings ..and reset the player ..If this will not make a stereo out ..than the left channel has an issue and need to be checked..Some has separated amplifiers patch and can go bad in just a channel ..but ..usually it is just the wire.. (If you have an amplifier connected ..check it too for settings ..and see if the balance is not all to the right ..)