Car Stereos: Wiring amp to stock HU in 2000 sunfire, inline fuse, gm models

Question
I recently moved my amp and subs from an old car to my 2000 sunfire. I hooked up power and ground, etc. The problem im having is that the stock HU has no remote or power antenna wiring. I just read a Q&A similar to this situation between you and a Justin concerning a 2005 silverado in april of last year. You suggested he splice into the 'class 2 serial data'. I tried this on mine (its a purple wire) but got no power after turning on the car. The rest of the HU wiring is as follows (for many older GM models):

Pin
Wire Color
Function

A1
PPL  
Class 2 Serial Data

A2
PPL
Class 2 Serial Data (no wire here on my HU)

A3-A7

Not Used

A8
TAN  
Left Front Speaker Output (+)

A9
GRY  
Left Front Speaker Output (-)

A10
LT BLU  
Right Rear Speaker Output (-)

A11
DK BLU  
Right Rear Speaker Output (+)

A12
BLK  
Ground

B1
ORN  
Battery Positive Voltage

B2
Not Used

B3
PNK
Radio On Signal (no wire here on my HU)

B4
GRY
Instrument Panel Lamp Supply Voltage - 1 (tried splicing here, nothing)

B5
BLK
Ground

B6
PPL
Gain Control Signal (no wire here on my HU)

B7
Not Used

B8
BRN
Left Rear Speaker Output (+)

B9
YEL  
Left Rear Speaker Output (-)

B10
DK GRN
Right Front Speaker Output (-)

B11
LT GRN
Right Front Speaker Output (+)

B12
Not Used

I have connected the remote wire to the constant 12V+ to ensure it has power, so at this point Im lost as to what to do. My radio turns off when the door opens, so I dont understand why splcing into the purple wire (class 2 serial data) doesnt work.

Any suggestions/thoughts? Thanks in advance.

Answer
Hi Matt,

If your deck doesn't provide some sort of remote wire, you might be forced to find something else in the car that has that functionality (perhaps the cigarette lighter?  And try that instead.  Be sure to put an inline fuse on it.

Justin