How to build a Power Supply for BMW ICOM

Best way “I” would build a power supply for icom bmw, buy OBDII Extention, Go to your local salvage place and buy BMW OBDII+20 Pin plug+wires(cut)
Then buy power plugs (male and female) from your local electric store and DIY your final product to this forum how much it cost you at the end

This is BMW ICOM A2 OBD+20pin cable

Icom 20pin to 16pin cable

16pin J1962 obd2 car proprietary connector at bmw

used in all BMW models produced after 2000’s

PIN	Signal	Description
pin 1	+12v	ignition (in run or start)
pin 4	CGND	chassis ground
pin 5	SGND	signal ground
pin 7	ISO 9141-2 K-line	engine (iso-914 ans iso-14230), automatic transmission diagnostic (in some models)
pin 8	ISO 9141-2 K-line	ike/kombi, abs, abs/asr, abs/abd, esp, dsc, airbag and other diagnostic equipment
pin 9	TD/RPM	engine rotation speed
pin 15	ISO 9141-2 K-line	k-line of iso 9141-2 and iso 14230-4
pin 16	+12v	battery power

Pinout status: +0 / -0

20pin car proprietary connector at the car side

used in all BMW models in 1988-2000’s

PIN	Signal	Description
pin 1	engine rotation speed	TD
pin 2	OBDII diagnostic
pin 7	oil service and inspection reset
pin 11	external starter turn on
pin 14	battery power
pin 15	ISO 9141-2 L line	RXD- Diagnostic data link
pin 16	ignition +12v
pin 17	USI 8141-2 k line	n/c?
pin 18	PGSP Programming line
pin 19	GND
pin 20	ISO 9141-2 K line	TXD- Diagnostic data link

Pinout status: +6 / -1

http://blog.obdexpress.co.uk/2016/12/02/power-supply-for-bmw-icom/