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Author Subject: Air conditioning wire schematic diagram
my3AWDgst

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Location: Rocklin

Registered: 04 Mar 2015

Posts: 84

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Post #1
Hey guise,
I'm looking for 97 and up A/C wireing diagram,specifically I'm after A/C request ON signal to ECU.

I got A/C to work on my 405 after engine swap however RPM does not increase when A/C compressor is engaged.
On 405 MI16 (US model) ECU gets those signals from A/C switch to ECU pin number 41 and from trinary switch to pin number 40.

Thanks in advance.

my3AWDgst has attached the following image:

________________________________________

Savo Stanivukovic
90 405 Sport Wagon 306 GTI 6 swapped.
89 405 MI16 ECMlink,SD,E85 swapped.
89 405 MI16 (standard)
91 405 MI16 (Sorento Green)
91 405 MI16 parts car.
91 405 Sport Wagon.
99 AWD Spyder.
98 AWD Spyder
2010 Genesis coupe track edition.
Posted 12th May 2016 at 08:43
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my3AWDgst

Junior User

Location: Rocklin

Registered: 04 Mar 2015

Posts: 84

Status: Offline
Post #2
Looking at this wire diagram (photo attached below) RS engine ECU gets those inputs at pin 26 and 50. I just need to know which pin is getting signal from A/C switch and which pin gets signal from pressure switch.

my3AWDgst has attached the following image:

________________________________________

Savo Stanivukovic
90 405 Sport Wagon 306 GTI 6 swapped.
89 405 MI16 ECMlink,SD,E85 swapped.
89 405 MI16 (standard)
91 405 MI16 (Sorento Green)
91 405 MI16 parts car.
91 405 Sport Wagon.
99 AWD Spyder.
98 AWD Spyder
2010 Genesis coupe track edition.
Posted 12th May 2016 at 08:46
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Denis

Regular

Location: Cambridge

Registered: 07 Sep 2004

Posts: 493

Status: Offline
Post #3
From Autodata:

26 - AC compressor ON
50 - AC ON

________________________________________

Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 12th May 2016 at 19:15
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my3AWDgst

Junior User

Location: Rocklin

Registered: 04 Mar 2015

Posts: 84

Status: Offline
Post #4
russian guy wrote:
From Autodata:

26 - AC compressor ON
50 - AC ON


Thank you very much. Once I have it all compleated I'll report back with an update.

________________________________________

Savo Stanivukovic
90 405 Sport Wagon 306 GTI 6 swapped.
89 405 MI16 ECMlink,SD,E85 swapped.
89 405 MI16 (standard)
91 405 MI16 (Sorento Green)
91 405 MI16 parts car.
91 405 Sport Wagon.
99 AWD Spyder.
98 AWD Spyder
2010 Genesis coupe track edition.
Posted 12th May 2016 at 22:31
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my3AWDgst

Junior User

Location: Rocklin

Registered: 04 Mar 2015

Posts: 84

Status: Offline
Post #5
I made a quick how to just in case if someone may need it in a future. I apologize for hand written diagram as at the moment I have no free time to make this on computer.

Pin #3 in small connector is White wire and it goes to ECU pin #50 (A/C ON) this wire needs to be shared with pin #6 in small GTI6 connector brown wire.This Brown wire goes to A/C compressor connector and it powers A/C compressor clutch (12V+)
Pin #4in small connector is Green wire and it goes to ECU pin #26 (A/C compressor ON)

Also diagram below explain how to connect your fan switch. With out it with ignition on or engine running your cooling fans will be in default mode and ON at full speed.

Both of these wires are located in same MC3A connector in pin #B1 and pin #B2.
Connect your GTI6 Brown A/C cooling fan sensor to US 405 MC3A connector.

Small 8 pin connector pin#1 yellow wire to MC3A connector pin B1 (red wire)
Small 8 pin connector pin#2 yellow wire to MC3A connector pin B2 (red wire)

my3AWDgst has attached the following image:

________________________________________

Savo Stanivukovic
90 405 Sport Wagon 306 GTI 6 swapped.
89 405 MI16 ECMlink,SD,E85 swapped.
89 405 MI16 (standard)
91 405 MI16 (Sorento Green)
91 405 MI16 parts car.
91 405 Sport Wagon.
99 AWD Spyder.
98 AWD Spyder
2010 Genesis coupe track edition.
Posted 16th May 2016 at 22:18
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my3AWDgst

Junior User

Location: Rocklin

Registered: 04 Mar 2015

Posts: 84

Status: Offline
Post #6
A/C compressor wiring in US 405 are located in brown MC3A 13 pin connector.
A2 pin is white wire 41 and it's coming form A/C select switch.
A5 pin is gray wire 6A and it's coming from Trinary switch to power A/C compressor clutch (12V+)

Connect following wires in this order to your GTI6 ECU,this way ECU is aware of A/C ON being requested.

MC3A brown connector to GTI6 small 8 pin connector

Pin A2 wire 41 to pin #3 White wire (pin#50 in GTI6 ECU)
Pin A5 wire 6A to pin #4 Green wire (pin#26 in GTI6 ECU)

my3AWDgst has attached the following image:

________________________________________

Savo Stanivukovic
90 405 Sport Wagon 306 GTI 6 swapped.
89 405 MI16 ECMlink,SD,E85 swapped.
89 405 MI16 (standard)
91 405 MI16 (Sorento Green)
91 405 MI16 parts car.
91 405 Sport Wagon.
99 AWD Spyder.
98 AWD Spyder
2010 Genesis coupe track edition.
Posted 16th May 2016 at 21:48
Profile
my3AWDgst

Junior User

Location: Rocklin

Registered: 04 Mar 2015

Posts: 84

Status: Offline
Post #7
Front of MC3A connector.

my3AWDgst has attached the following image:

________________________________________

Savo Stanivukovic
90 405 Sport Wagon 306 GTI 6 swapped.
89 405 MI16 ECMlink,SD,E85 swapped.
89 405 MI16 (standard)
91 405 MI16 (Sorento Green)
91 405 MI16 parts car.
91 405 Sport Wagon.
99 AWD Spyder.
98 AWD Spyder
2010 Genesis coupe track edition.
Posted 16th May 2016 at 21:49
Profile
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