2001 Chrysler 300 Infinity amp replacement

Tiny
JSHARON26
  • MEMBER
  • 2001 CHRYSLER 300
  • 80,000 MILES
2001 Chrysler 300
Infinity amp replacement

It appears the trunk installed Infinity amp has quit working. The radio will not produce sound from any speaker, although all functions on the radio and CD appear to work. I have checked all connections and fuses that I could find. The dealer doesn't have a replacement available and neither do aftermarket stores. Is there a hidden fuse for the amp that I missed and how can I verify whether its the radio or amp before replacement? Thanks
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Tuesday, March 22nd, 2011 AT 2:23 PM

17 Replies

Tiny
CARADIODOC
  • EXPERT
If you have the am / fm / cassette or the am / fm / cd with htree tone controls with yellow leds, suspect a radio failure. Find the model number on the radio and I'll tell you the fix.
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Tuesday, March 22nd, 2011 AT 6:33 PM
Tiny
JSHARON26
  • MEMBER
It is the am/fm/cassette with CD player and has the 3 graphic equalizer sliding yellow led controls. Everything functions on the unit except sound. Where is the model # located and does the radio have to be removed from the dash, if so, how?
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Tuesday, March 22nd, 2011 AT 7:46 PM
Tiny
CARADIODOC
  • EXPERT
Those combo radios are mostly built by Mitsubishi and are very high quality. It is one model I sell a lot of to replace the Chrysler-built cassette-only and cd-only radios. While there could be a problem in the radio, it's more likely to be an amp problem or a power supply problem. I have some amps but they are from older models and will likely be different. Look at the plugs on your amp. It's on the left side in the trunk. There should be a 12-pin plug and a 22-pin plug. In the 22-pin plug, look for pin 1, red / white wire, and pin 12, a red wire. Both of those should have full battery voltage all the time. They are across from each other on one end of the plug. Next, check for 12 volts on pin 3, a dark green / red wire. That one should have battery voltage only when the radio and ignition switches are turned on. Check pins 2 and 13, black / light green, also right across from each other, to be sure there is no voltage on them. If there is, the ground wires have a break. If the voltages are okay, suspect the amp. Chrysler amps rarely fail, but I did have one go out on my '93 Dynasty at 4,000 miles, (two years ago).
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Tuesday, March 22nd, 2011 AT 8:22 PM
Tiny
JSHARON26
  • MEMBER
I will check the voltages. The radio code is RBB, does that confirm your idea on which radio it is?
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Tuesday, March 22nd, 2011 AT 10:40 PM
Tiny
CARADIODOC
  • EXPERT
Nope. I never got involved with sales codes, just model numbers. That's what I use to order service manuals.
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Tuesday, March 22nd, 2011 AT 11:05 PM
Tiny
JSHARON26
  • MEMBER
I replaced the infinity amp with an exact model and it didn't play sound either. I then checked for 12 volts as described above and there is no power anywhere on the plug. Had heard there was an amp fuse under the rear seat, so removed it and didn't find one. Is there an amp fuse somewhere? What else to check and if the radio has to come out, how?
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Thursday, March 24th, 2011 AT 8:56 PM
Tiny
CARADIODOC
  • EXPERT
I only have a 2000 service manual but I think the circuitry is the same. Check fuse # 18, a 20 amp yellow fuse inside the car. Fuses # 4 and # 19, both red 10 amps, are for the radio. They should be good if the radio is working.
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Thursday, March 24th, 2011 AT 9:26 PM
Tiny
JSHARON26
  • MEMBER
I've pulled and checked every single fuse that's in the left side of drivers console panel, all are good.
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Thursday, March 24th, 2011 AT 9:52 PM
Tiny
CARADIODOC
  • EXPERT
Then there's only three possibilities. There might be another fuse under the hood that is blown but I would expect there would be other things that wouldn't be working. Two, there is a break in the wire going to the amp, or three, you did something incorrectly when measuring for those voltages. I'm inclined to think the third reason is it because if you measured with the ignition switch and the radio turned on, you should have 12 volts on three different wires. Two get their power from the amplifier fuse and a different one gets its power from the radio when it is turned on. That third one from the radio is the turn-on signal for the amp. To lose voltage on both circuits at the same time would be very unusual unless a mouse or some other damage to the wiring harness was involved. Double-check where you had your voltmeter or test light grounded to be sure it makes a good contact and isn't insulated by paint or rust.
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Thursday, March 24th, 2011 AT 10:19 PM
Tiny
JSHARON26
  • MEMBER
Of the 3 possibilities 1)No fuses under the hood in the fuse box were bad. Unless there is a hidden fuse somewhere in the car, all fuses have been checked. 2)Car is parked on a farm, so possible, but no way to verify further. 3)I verified a seperate DC source with the meter and tried several grounds including the gnd on the cable-zero. I will use a different DVM and try again. So, trying to finish this up for you--if there is no voltage again. What and if I do find voltage everywhere it needs to be. What? I don't think 2 amps would be bad, even if I measured wrong and there is power, the new amp didn't fix the issue which leaves wiring and radio. Thanks
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Thursday, March 24th, 2011 AT 10:45 PM
Tiny
CARADIODOC
  • EXPERT
That would leave the radio power wire which is the turn-on signal for the amp. It will be a dark green wire with a red stripe. Some radios use an internal relay to switch that circuit on and off. Those relays can develop broken solder connections. To prove it, if you do find the other two wires have 12 volts, you can use a piece of wire to jump from one of them to the dark green / red wire to turn the amp on. If the radio plays fine then and all other functions work, I can describe a wiring modification that will turn the amp on and off with the ignition switch only, regardless if the radio is on or off. The amp will still turn off so it won't drain the battery.
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Thursday, March 24th, 2011 AT 11:10 PM
Tiny
JSHARON26
  • MEMBER
This now falls under the OMG category. I just found out from the original owner who had told me all the stereo was factory OEM, now said that the radio had failed 2 years ago and did this exact same thing and was replaced by another OEM radio and fixed the problem. Time and energy looking in the wrong direction, sorry. How do you remove the panel to remove the radio and if I need to replace the radio (RBB) what is the simplest option to install another factory radio?
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Thursday, March 24th, 2011 AT 11:18 PM
Tiny
CARADIODOC
  • EXPERT
The trim bezel snaps on and off. If you can't pull it off by hand, use a wood or plastic stick to pry it off. There will be electrical connectors that might have to be unplugged to get the bezel out of the way. Four philips screws hold the radio in, one in each corner. When you slide it out, there will be a sticker on top with the model number and supplier number. Most likely your supplier number will be "28046". That is for Mitsubishi. They make most of the cd / cassette combo radios and are very high quality. If you tell me the model number, I can repair yours, sell you a different one, or tell you which other models will work in place of that one.
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Friday, March 25th, 2011 AT 12:11 AM
Tiny
JSHARON26
  • MEMBER
Radio removed. Info from the data plate--Part#56038518AJ, Issue 1, RBB CASS, SCL=000, Date code 0851 0614, Supplier 07910, S/N T 51 AH 085 1 04003. At this point I'd like to find a replacement today as I have a long trip in 2 days. If thats not possible, explore other options. So, 1)looking at a junk yard that already has the radios pulled, what will be an exact replacement and 2)is the repair you mentioned quick and simple, if so, I'm an CET and might do that as a last resort but would prefer a local exact unit used. Thanks.
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Friday, March 25th, 2011 AT 4:59 PM
Tiny
CARADIODOC
  • EXPERT
Ahahh! This is not a cd / cassette combo radio. That model is a cassette-only radio. I could have saved a whole lot of time if I knew that. Here is a copy of the reply I use a lot: There is one model of cassette player and one model of cd player, both built by Chrysler that have microprocessors built by North American Philips, (NAP), the same people who build the really crappy Magnavox and Sylvania tvs that I worked on for 35 years! These microprocessors have a 100 percent failure rate. I have the equipment to replace them, but then the software must be burned in. They will never sell me the equipment to do that. These radios have three tone controls with yellow leds. The cassette player is model number 56038518. All I can remember of the cd player is the model number ends in a "67".

There is a long list of common problems, but the most common ones are the yellow leds flash on and off with a thumping sound in the speakers, and no display, or, the radio goes dead momentarily when moving the volume or tone controls. Some appear to work but have no sound. It is not cost effective to send these radios in for repair, but there are other models made by Mitsubishi for Chrysler cars that are very reliable. There's a direct replacement for the cassette player that looks exactly the same, has the same three lighted tone controls, and will run the same remote cd changer if you have one. The only noticeable difference is it has one extra button for "Scan". These sell for more than 70 bucks on eBay because used car dealers all over the country are looking for them for their used cars.

If you have the Chrysler-built cd player, I'd recommend upgrading to a cd / cassette combo. These are also built by Mitsubishi and give very little trouble. There are cd-only units but most of them are built by Alpine. Alpine is the only company that will not allow the authorized service centers to sell me parts or service manuals. I can still fix them, but I don't promote products for companies that pull this selfish nonsense.

If you snap the trim cover off that covers the radio, you will see four screws that hold the radio in. Remove them and pull the radio out just enough to read the model number on top. You can also tell who built it by looking at the "Supplier Number".

07910 is Chrysler
28046 is Mitsubishi
26777 is Alpine
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Friday, March 25th, 2011 AT 7:18 PM
Tiny
JSHARON26
  • MEMBER
Problem solved. Sorry for the confusion over the radio, it is am/fm cass and has a factory CD player right below but not in the main unit. I missed where was asked or maybe I should have given better details. Anyway, I found a 28046 replacement in a junkyard that works for $50. Thanks a lot for your help.
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Friday, March 25th, 2011 AT 8:20 PM
Tiny
CARADIODOC
  • EXPERT
Yippee. Happy to hear you found the Mitsubishi model.
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Friday, March 25th, 2011 AT 9:12 PM

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