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6x40W Amplifier Install Question - What is the pinout for 996.645.301.

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Hi Everyone,

I have had a 6x40W amplifier sitting in my garage for quite some time waiting to be installed for my rear speakers. I decided to install it today, and have the entire thing wired. However, as I was about to finish up and install the amplifier, I noticed that the serial number on it is different than what most people have been installing.

I have a 1999 Boxster with standard 4x40W amplifier. I want to install a Nokia 6x40W M490 amplifier with the serial number 996.645.301.01. Searching around I have only found one mention of this particular serial number.

Is anyone familiar with this amplifier? Is the pinout the same for the rear speakers and/or the rest of the pins?

I was going off of this:

RL+ #6

RL- #16

RR+ #5

RR- #15



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If you have the 490 Option you need a HAES 6x40W AMP with the following: 996 COUPE M490 996.645.311.00

Other AMPs may work but I know this one does for sure. Perhaps others can chip in.


Use a wood chisel or exacto knife and remove this key from your 6x40W AMP so it will mate properly with your harness.


You will need the AMP adapter that attaches to the infamous brown plug in the back of the radio. I have extra adapters if you need one.

If you look closely (I use a magnifying glass) under good light you can see the pin numbers on the AMP.

Pin #10 - yellow - (left dash +)
Pin # 20 - yellow brown - (left dash -)
Pin # 9 - red - (right dash +)
Pin #19 - red brown - (right dash -)
Pin #18 - Green - (left door +)
Pin #8 - Green Brown -( left door -)
Pin #17 - Purple - (right door +)
Pin #7 - Purple Brown - (right door -)

Pin#16 - (Rear Left - )

Pin#6 - (Rear Left + )

Pin#15 - (Rear Right - )

Pin#5 - (Rear Right +)

Pin # 2 - RED BLUE - Power
Pin #1 - BROWN - Earth or Ground

Edited by kbrandsma
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@kbrandsma thank you for the help!

After your post, I went ahead and took all three tabs off the inside of the amp plug (they where all one pin off compared to the 4x40W), and tried it out. Reconnect the battery and it works just fine! Very pleased this amp will work, and now I can confirm for any future 986 owners that stumble across this model amp, that it will work.

One other question, I am having a hugely difficult time getting the rear speaker wire female pins into the amplifier plug. I can get them 75% of the way in, and then they simply won't go in any farther, even with some prodding from a pair of pliers.

Any suggestions/tips?

Lastly, for anyone who might see this and is installing the OEM rear speaker kit with the inadequate 12" extension I have a tip I have not seen posted anywhere else. Cut the brown plug off of both the speaker cable and extension. Run the speaker cable through the firewalls, then soldiered it to the 'extension' that goes into the amp. The speaker cable is long enough to clear both firewalls. I also cleaned it up a bit with some heat shrink tubing.

Edited by rick3000
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One other question, I am having a hugely difficult time getting the rear speaker wire female pins into the amplifier plug. I can get them 75% of the way in, and then they simply won't go in any farther, even with some prodding from a pair of pliers.

Any suggestions/tips?


They may be the wrong size PINS. You may need to replace with longer ones. If you have a tool you can pull out an existing pin from the AMP and see if they match.

Edited by kbrandsma
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