Summer 2005 a "BillBob" posted an inquiry about the DIN plug on a 93 900 Volvo amplifier. It is not possible to respond to his posting directly so I am posting this in response to his question and anybody else as I've had occassion to disassemble an HA4111 amp in order to discover the pinout or pinin on the DIN plug used by the amp to receive signal from the Volvo radio. The DIN pin contains five terminals. Holding the plug facing you, you will see a pin in the center (I refer to as #1), a pin directly above it at the 12 o'clock position (refered to as #2), a pin at 10 o'clock refered to as #3, a pin at 2 o'clock referred to as #4, a pin at 8 o'clock refered to as #5, and a pin at 4 o'clock refered to as #6. The amp board when opened shows five wires terminating at its underside which come from the DIN cable that terminates at the DIN plug. The five wires are colored Black, White, Yellow, Red, and Green. The board signfies which stage of the amplifier the wires are attached for (RF,RR,LF,LR). The wires are as follows with accompanying pin # on the DIN plug:

Black - Right Front (input) - #4 (2 o'clock)
White - Right Rear (input) - #2 (12 o'clock)
Yellow - Left Front (input) - #6 (4 o'clock)
Red - Left Rear (input) - #5 (8 o'clock)
Green - Signal Ground (common input) - #3 (10 o'clock)

The #1 pin in the center appears not to be connected to a wire and may simple serve as a centering pin for the DIN plug. The outer circular metal shell of the DIN plug is connected to the braided wire that encompases the entire cable and which is soldered to the amps chassis. This is a ignition noise abatement item.

The DIN plug strictly caries output from the radio to the 4 channel amp. The amp boost the signal and sends it out through 16 gauge wiring coming out of its rear plate. The pinout on the amp is described in other postings on this board, please search under "connector", etc. to find them. A colored wiring diagram is on file in the gallery as well.

The pinout and the pinin are most likely usable on other Volvo amps and radios. The technique for determining pinin arrangement, or pin out for that matter, is described as follows:

Position was determined through the use of the continuity test on a VOM. Pin reading zero (0.0) ohm were said to be continueous and determined to occupy that pin on the DIN plug. I'll attempt to add a photo and diagram to the gallery when I have time. I hope this helps. Keep Rolling.
P.S. DIN plugs and jack are available through www.digikey.com or 1-800-DIGI-KEY.
Chao!