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36 (20+8+8) pin Head Unit / Car Stereo ISO connector layout
36 (20+8+8) pin Head Unit / Car Stereo ISO connector
Blaupunkt

Standard pinout: 

Pin
Number
Pin
Name
Description
1 A1 SCV 
2 A2 Mute 
3 A3 the reversing light switch. 
4 A4 Memory Power (12V direct from Battery). Connects the radio directly to the battery.
5 A5 Power for Electric Antenna. Output from the stereo +12 V (maximum 150 - 300mA) power supply for automatic or electronic antennas.
6 A6 Dial-light illumination (car side light circuit). +12 V input on the car when the lights are on. 
7 A7 +12V Main Power (Switched via Ignition key). +12 V with the ignition key is in the ACC or ON position.
8 A8 Ground (Chassis)

Car audio ISO connector B pinout

Connector B is used only for the speakers. 

Pin
Number
Pin
Name
Description
1 B1 Right Rear +
2 B2 Right Rear -
3 B3 Right Front +
4 B4 Right Front -
5 B5 Left Front +
6 B6 Left Front -
7 B7 Left Rear +
8 B8 Left Rear -

Car audio ISO connector C pinout

Pin
Number
Pin
Name
Description
1 C1 Line out left rear
2 C2 Line out right rear
3 C3 Line out ground
4 C4 Line out front left
5 C5 Line out front right
6 C6 +12v switched - maximum 150mA
7 C7 RXD
8 C8 TXD
9 C9 Chassis ground
10 C10 +12v switched - maximum 150mA
11 C11 Remote control in
12 C12 Remote control ground
13 C13 CDC data in (bus)
14 C14 CDC data out
15 C15 CDC +12v permanent
16 C16 CDC +12v switched - maximum 300mA (+A)
17 C17 CDC data ground (+U)
18 C18 CDC audio frequency ground
19 C19 CDC audio frequency left
20 C20 CDC audio frequency right

 Alfa Romeo pinout:

A: Power B: Speakers C: Changer / special
1. CAN B 1. RR 1. -
2. BOSTER IN (CD) 2. RR - 2. -
3. CAN A 3. RF 3. -
4. - 4. RF - 4. -
5. sterowanie anteny 5. LF 5. -
6. - 6. LF - 6. sterowanie BOSTER
7. +12 V BATT 7. LR 7. Tel AF+
8. Masa (-) 8. LR - 8. Tel AF-
Radio is connected only one plus,
so do not turn off the ignition.
  9. Tel MUTE
10. RC-A
11. RC-B
12. masa
13. DATA IN
14. DATA OUT
15. +12V niewyłączane
16. +12V wyłączane
17. masa
18. CD audio GND
19. CD audio L
20. CD audio R
13-20 CD Changer Interface
According to 1 reports in our database (1 positive and 0 negative) the Alfa Romeo 147, 156 Head Unit ISO pinout should be correct.

Is this pinout
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