Check if it has a built-in amp in the stereo system
April, 24, 2011 AT 3:56 AM
Where would the amp be located?
April, 24, 2011 AT 4:13 AM
Describe your model. Do you have a cd player with no cassette?
April, 24, 2011 AT 4:56 AM
It is the original factory installed stereo system - AM/FM, CD & Cassette Player. It has a small joy stick located on the radio face for speaker selection (front, rear & side). It is a 6 speaker system, two in the dash, two in the front doors and two located in the side panels near the rear of the van.
April, 24, 2011 AT 5:21 AM
That model is built by Mitsubishi and is of very high quality. The common problems are intermittent loss of FM, the front switches don't work or perform the wrong functions, and the volume control doesn't respond well. All of those typically only need to be fixed once and won't act up again after that.
The Infinity version has small amplifiers bolted to the main speakers. Even if those amps aren't turning on, most models have some speakers that don't use the amps. They should still be putting out a little sound. The place to start is by checking the memory fuse. Some models appear to work but have no sound when that circuit is dead. It's usually tied in with the interior lights but it could also be the cigarette lighter or horn fuse. Sorry that I can't remember if it's under the hood or in front of the brake pedal.
You can look for an amplifier fuse too. Many newer models use a remote-mounted amp instead of the little ones bolted to he speakers. That system usually has no sound at all when the amp doesn't turn on.
April, 24, 2011 AT 10:03 PM
Checked the interior lights, cigarette lighter and horn all are working. I looked in the owners manual and a memory fuse or amplifier fuse is not shown for the fuses located under the dash inside the van. What does a memory fuse look like? Flat and small or the big square type? I also checked in the fuse box under the hood and nothing is labeled for the stereo I did locate a cig & accessory relay but I don't believe that is the problem as the cig lighter works. The Infinity Stereo appears to be working as it displays radio channels and the LED lights move when using the cassette or CD but there is defintely no sound. Moved the joy stick to front only, rear only, side only and it did not make any difference, still no sound. If the system does have a remote mounted amp, where would it be located? Any other suggestions? Thanks
April, 24, 2011 AT 10:40 PM
The closest book I have is a '97 service manual, but it should be the same circuit. The two rear speakers and the two door speakers have little amplifiers bolted onto them. They will have four wires in their electrical connectors. Tapped off of them are the two rear pillar speakers and the two dash speakers. Those do not use amplifiers. They will work even if power is lost to the amps. That means you do not have an amplifier problem. Just in case they changed that for '98, you can verify that by removing one of the speakers with an amp and measuring the voltage on the power and ground wires. The red / dark green must have 12 volts when the ignition switch and radio are turned on. The black / dark green must have 0 volts.
The next thing to observe is if the clock goes back to 12: 00 each time you turn on the ignition switch. If it does, the memory fuse is blown but there should be other things not working including that air bag light should be on. We'll head that way if necessary. If the clock maintains its memory, the two power circuits are working.
The only thing I can think of in that model that can cause no sound is a cracked front circuit board. That is REAL common if UPS gets a hold of it and bounces it off the floor! The volume **** gets shoved into the radio and shatters the circuit board. I've repaired a few dozen for that. It can be very time-consuming to follow all the tiny circuits with a magnifying glass. I've spent as much as seven hours repairing those boards. If it's really badly damaged, I have good used ones to pop in instead. Another common cause is from someone hitting the volume **** in frustration when the buttons don't work right. I repair those buttons too.
It's always possible there is a shorted audio amplifier IC inside the radio. That is very rare on the Mitsubishi-built radios. Depending on the model, one of them either runs the front speakers or the left speakers. Sometimes when one shorts, it puts a voltage on the "muting" circuit which turns the other one off. That is the circuit that cell phones are tied into.