This is a cool bit of vintage Alpine gear so I get why you'd want to hold onto it. Open the case and take a look at the RCA sockets for mechanical damage. They may only need a dab of fresh solder to fix the bad connections. If the board has a break in it you can add wire traces to the section that has failed to create a new solid connection.
SOURCE: auxilary RCA inputs have no volume control
Your problem stems from the fact that the CDA-7892 is not equipped with an RCA aux-input jack. If you're plugged into RCA connectors at the back of the head unit, they're outputs, not inputs. The sound you hear is just feeding back through the outputs and into the head unit's amplifier. If you want to play your iPod through this head unit, you need to purchase either the auxiliary input adapter (KCA-121B) or iPod adapter (KCA-420i).
SOURCE: Alpine MRD-M500 Amplifier
That is a code to inform you of an issue, and to help direct you to a particular area of concern
HOT & E-1 = both for heat issue
E-2 = for a voltage issue
E-3 = for a current issue.
While yours is a current issue, that reflects a problem with your input or output signal pairs. You should disconnect the subs at the amp, then operate the unit as normal to see if the code reappears. This is the start of your process of elimination, where as you will be able to determine the general location of the issue, weather it is before - internal - after the amp, hence If after the subs were disconnected, the code did not return then it would be obvious that you should focus on the subs and their signal pairs. troubleshooting in small increments until the issue is discovered.
Hope this helps...Good luck
Aduz
SOURCE: connect alpine 7874 to alpine powered sub
You need to run the RCA cables from the head unit to the sub for the audio signal, and possibly a turn on wire (the blue one on the back of the head unit), unless the sub has an automatic power feature.
The sub also needs power and ground wires attached, but those do not connect to the head unit. Power should be run directly from the battery with an inline fuse, and ground should go to the nearest good ground point (Trunk latch, seat bolt, etc).
SOURCE: Alpine CDA 9827 using aux mode with ipod shuffle via rca inputs
Unfortunately, the rca outputs are to control an amplifier or crossover. They do make an ipod adapter for that radio, which allows you to control the ipod through the radio. Best Buy or any Alpine dealer should carry something for around $25.
SOURCE: Alpine PDX1.600 amp cuts off
Make sure there's no missmatched impedance. If your sub running 2 ohms then your amp has to be 2 ohms stable. Does the amp blow fuses or get really hot? If it does it can be a fire hazard and I would recommend taking it out of your car. It could be that you don't have sufficient grounding. The grounding needs to be very close to the amp and the paint needs to be thoroughly scratched off. Otherwise could be a blown transistor within the amplifier, you can check this by opening up the amp, running a multimeter and testing the transistors for resistance.
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