A 2 part question

1. I recently had some work done on my 97 civic:

Replace O2 sensor, exhaust manifold/catalytic converter
Replace the distributor cap, rotor, ignition wires, and spark plugs.
Change the oil and oil filter

When I got the car back, the driver front speaker was out. The initial reason for the service was an error code, so I know that they reset the ECU. None of this activity should impact a single speaker, though, should it?

Looking at the electrical schematic, it appears that all the audio components are on the same circuit. If there was a fuse out, the whole audio system would be out, and not just one speaker, correct?

2. Speaker works perfectly fine one day, service, then off. All other speakers are working fine. I'm leaning towards wiring, but not sure where to start. It seems like getting to the wiring to check it is going to be a hassle wherever I go. For 97-00 honda civics, is there any particular weak link in the speaker wiring chain? Is there any part of the wiring that tends to go before the rest does?

I have moisture issues in other parts of the car (trunk, headlights), but I'm relatively certain the door and under the dash is dry.

Where would you start first?

 

Hi, is car audio factory or aftermarket?

 

As silly as it sounds, have you checked the balance control on the HU? 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">As silly as it sounds, have you checked the balance control on the HU? 94</TD></TR></TABLE>
That's not silly. It is ALWAYS the K.I.S.S. rule with car audio.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by omega02379 &raquo;</TD></TR><TR><TD CLASS="quote">
That's not silly. It is ALWAYS the K.I.S.S. rule with car audio. </TD></TR></TABLE>

Yea but it is not something that most people will admit they did not check. 94

 

what the k.i.s.s. rule?

 

Your correct on your thinking, if the internal amp had gone out or gotten shorted, generally all your audio will cut out, if a speaker wire is shorted, all sound is attenuated completely, but if you have a simple break in the wire (not shorted) this would explain the front left speaker. Just for fun let me add this in, and if i were you i would check this,
ok here goes, my brother has a 96 civic ex, i put a 3 way rf component set in his front doors, and when i turned on his system the front left speaker was not working, it bothered me because i make very good connections, i solder connections and so on, furthering my investigation i noticed that when i open the driver side door, the boot that goes from the door to the inner fender well, well you can unplug that harness from the door via the connector clip, i think earlier honda's you cannot do this, well when i unclipped it and lightly pulled back the boot, i noticed like 6 of the wires had just came loose from the connector, and that is CRAP, those connections should not have just came loose like that, factory wiring is usually awesome, but not this time, and because of the vast amount of electrical grease in the connector, i could not see or clean it out, i could barely get a tooth pick in there to clean the connectors. so check that harness, its definitely a "weak link". Also pull the panel over the speaker off, pull the speaker, check the speaker to make sure it still has 4ohms ± .5 ohms of resistance. That will tell you if the speaker coincidently just kicked the bucket or not.