01 L-series stereo - questions

Never had a problem (yet) with the audio in my '01 lw300 (and I often crank the volume). Do you know yet if it is the speaker, wiring or radio? I have the service manual for my car if you need info.

Any chance the speakers covers were cleaned? Years ago I thought I was carefully cleaning the speaker cover on a toyota but the speaker was dead afterwards I guess from shorting out.

I have only gone as far as removing the stereo from the dashboard to see if the connections on the back had become disconnected, reinstallation changed nothing.

The speakers have not been cleaned or gotten wet, and especially not all three of them in the L300.

I suppose the next step is to ensure the problems are the stereo or the speakers. I do not have a wiring diagram of the connector on the rear of the stereo so I cannot determine which speaker is wired to which pins.

Any chance of sending me the connector wiring diagram out of the manual?

Cheers, Tom

Tom, Will try to send them to you tonight from home. Do you have a fax # I can send to or would you prefer I send to your hotmail account? Easier for me to fax. Reply to: oppie(at)cloud9.net

Main radio plug for uplevel system is Gray Shown as A1-A12, B1-B12

| | | A1 A12 | | B1 B12 | |

A8 BRN LR SPKR (+) A9 YEL LR SPKR (-)

A10 DK GRN RF SPKR (-) A11 LT GRN RF SPKR (+)

B1 ORG BATT (CLOCK) HOT ALL TIMES B2 YEL IGN B3 ORG BATT (CD CHANGER) B4 GRY DISPLAY DIM+

B8 TAN LF SPKR(+) B9 GRY LF SPKR(-)

B10 LT BLU RR SPKR(-) B11 DK BLU RR SPKR(+)

B12 BRN PARK LAMP INPUT A12 BLK GROUND

Woofers are in parallel with tweeters. Tweeter has a series capacitor (crossover) built in.

Unless you have the premium amplifier system that has a separate booster amp, it would appear that your woofers are somehow blown or connector in door is defective.

The premium system has the front woofers and tweeters paralleled but has 4 separate amplifiers for the rear woofers(2) and tweeters(2).

Hope this points you in the correct direction.

Wow, Oppie,

Sorry. I've been offline for a few days.

Thanks for the info, that was exactly what I was hoping for.

From the sound of things (tweeter works, corresponding woofer doesn't), I have a few dead woofers. Weird.

If you would like to fax me the manual pages, I would appreciate it. I do have a fax at work, but do not have the number right now. I can send it via e-mail tomorrow.

If you can scan it to a PDF file, go ahead and send it to my hotmail account.

Thanks again.

Cheers,

Tom

Like I said, the fax is easier. Tell me exactly what you need since the manual is scattered all over the place and the index stinks. (btw you can buy a manual online from

You might want to check with an ohmmeter from the radio connector the speaker circuits for opens first. If the circuit is open, trace back to the speaker and see if the voice coil itself is open or if it is a wiring/connector issue. If the voice coil is open, there is a possibility that there is a problem with the radio. Both speaker leads are floating above ground and typically sit at an average voltage of battery/2 or 6V. If one wire gets grounded accidentally, it can blow the speaker, amplifier or both. If you measure the DC voltage across a working speaker it should be 0. If something is crashed and there is a DC voltage on the speaker bus, it will not kill the tweeter. The tweeter has a built in crossover capacitor which blocks any dc voltage. Oppie '01 lw300

Oppie, Thanks.

I think I have enough to do some cursory checks with my ohmmeter.

I am scratching my head about the tweeters working and the midrange speakers not, considering that they are in parallel.

If I need any more info I will be sure to make noise (unlike three of my stereo channels).

Thanks again, you have gone above and beyond the call.

Tom

Remember that the tweeters have a capacitor in series with them. This blocks any net DC voltage that might appear on the speaker bus. Probably the next step is opening up the inside door panel to check the woofer connections and if the voice coil is open. I've been hearing that it is easier to remove the outer (plastic) door skin than the inner. Don't know if you can get to the connectors and speaker from the outside. If the speaker has to be changed, it has to be removed from the interior side.

You should also measure the DC voltage between the radio speaker output terminals. Should be no more than .25V. Do this with the radio on and volume down.