d1nonly34

shawnvw nice diagram im assuming the automatic/digital system is going to be different. where are the hvac modules located? under the hood? seems like I would have to change hvac modules and wiring harnesses for it to work, hopefully not the whole blower system and what not.

shawnvw

AUTOMATIC SYSTEM


HVAC Control Module C1

Connector Part Information[*]OEM: 15491305[*]Service: 15126709[*]Description: 20-Way F USCAR 0.64 Series (BN)


Terminal Part Information[*]Terminal/Tray: SAITS-A03T-M064/14[*]Core/Insulation Crimp: P/P[*]Release Tool/Test Probe: J-38125-215/J-35616-64B (L-BU)[*]
HVAC Control Module C1

Pin
Wire Color
Circuit No.
Function

1
WH/BK
5515
Inside Air Temperature Sensor Assembly Control

2-3
Not Used

4
D-GN
734
Inside Air Temperature Sensor Signal

5
GY
1548
Passenger Sunload Sensor Signal

6
BN
404
Upper Air Temperature Sensor Signal (C69)

7
L-GN
405
Lower Air Temperature Sensor Signal (C69)

8-13
Not Used

14
D-GN
5518
Auxiliary Inside Air Temperature Sensor Signal (C69)

15
L-BU/BK
590
Driver Sunload Sensor Signal

16
TN
516
Upper Left Air Temperature Sensor Signal

17
TN
517
Upper Right Air Temperature Sensor Signal

18
PK
2145
Air Temperature Switch Signal - Right (C69)

19
GY
2599
Auxiliary Mode Door Control (C69)

20
Not Used


HVAC Control Module C2

Connector Part Information [*]OEM: 15491285[*]Service: 15136073[*]Description: 16-Way F Kaizen 0.64 (BK)

Terminal Part Information [*]Terminal/Tray: SAITS-A03T-M064/14[*]Core/Insulation Crimp: P/P[*]Release Tool/Test Probe: J-38125-215/J-35616-64B (L-BU)
[ul][/ul]HVAC Control Module C2

Pin
Wire Color
Circuit No.
Function

1
RD/WH
3340
Battery Positive Voltage

2-3
Not Used

4
L-GN/BK
735
Ambient Air Temperature Sensor Signal

5
D-GN
5060
Low Speed GMLAN Serial Data

6
D-BU
204
A/C Low Pressure Sensor Signal

7
Not Used

8
BK/WH
1851
Ground

9
OG
300
Ignition 3 Voltage

10
WH
193
Rear Defog Relay Control

11-14
Not Used

15
BK
1050
Ground

16
D-GN
6101
Low Reference

HVAC Control Module C3

Connector Part Information [*]OEM: 15491304[*]Service: 15126710[*]Description: 20-Way F USCAR 0.64 Series (GY)
[ul][/ul]Terminal Part Information[*]Terminal/Tray: SAITS-A03T-M064/14[*]Core/Insulation Crimp: P/P[*]Release Tool/Test Probe: J-38125-215/J-35616-64B (L-BU)
[ul][/ul]HVAC Control Module C3

Pin
Wire Color
Circuit No.
Function

1
TN
518
Lower Left Air Temperature Sensor Signal

2
YE/BK
713
Defrost/Heater Mode Valve Position Sensor Signal

3
PU
1838
Recirculation Door Position Signal

4
GY/BK
754
Blower Motor Speed Control

5-9
Not Used

10
GY
598
5-Volt Reference

11
TN
520
Lower Right Air Temperature Sensor Signal

12
L-BU
733
Air Temperature Door Position Signal

13
D-BU
1646
Auxiliary Air Temperature Door Position Signal (C69)

14
Not Used

15
TN
2273
Mode Door Control

16
D-BU
1199
Air Temperature Door Control

17
D-GN
1614
Recirculation Door Control

18
WH/BK
1236
Auxiliary Air Temperature Door Control (C69)

19
Not Used

20
YE
1791
Low Reference

HVAC Control Module C4 (C69)


Connector Part Information[*]OEM: 15483874[*]Service: 21997401[*]Description: 16-Way F Kaizen 0.64 Series (GN)
[ul][/ul]Terminal Part Information[*]Terminal/Tray: SAITS-A03T-M064/14[*]Core/Insulation Crimp: P/P[*]Release Tool/Test Probe: J-38125-215/J-35616-64B (L-BU)
[ul][/ul]HVAC Control Module C4 (C69)

Pin
Wire Color
Circuit No.
Function

1
Not Used

2
GY
596
5-Volt Reference

3
OG
2215
Auxiliary Mode Door Control

4
GY
2614
Auxiliary Air Temperature Door Control

5
Not Used

6
GY/BK
1798
Low Reference

7
BN
5516
Inside Air Temperature Sensor Assembly Control

8-9
Not Used

10
D-GN
2211
Auxiliary Blower Motor Speed Control

11-16
Not Used

shawnvw

I've also just noticed after going through a few diagrams,the recirculation actuator, in the automatic system,has an extra wire to tell the hvac control module in what position it is in


And the HVAC control module is the controls in the dash. It is the brains of the unit

shawnvw

shawnvw

FRONT TEMP SENSORS

d1nonly34

shawnvw, i hate to keep bothering but after seeing all these diagrams I started to think even more thoroughly.... since I changed my whole entire dash from an lt1 to a ltz, that means that not only did the hvac module (digital a/c control switch) come with the new dash, but also the wiring for it, including to the bcm. I talked to my friend whom is a tech at chevy and he told me that he had programmed the bcm to automatic a/c from manual a/c (which is probably why my a/c is working right now). So with the dash also came the duct work, and I'm assuming that the air temp sensors are already included. All i'm really missing is the incar sensor above the drivers head and the sunload sensor. Does the wiring to the blower and such (on the right side above passenger foot well) change at all from manual to automatic? Obviously they do at the control switch, but I recall that I didnt need to disconnect any harness from that whole unit behind the pasenger glove box, I hope that made sense lol.

shawnvw

between the auto and manual controls, the wiring is exactly the same as far as the blower motor is concerned. There is 1 wires that comes from the controls to a blower motor module, whihc is really a solid state resistor. Which in turn powers the blower motor and changes speed based on the signal from the wire from the switch. That wire varies from 0-5v depending on fan speed chosen.

I would agree with you when you say "So with the dash also came the duct work, and I'm assuming that the air temp sensors are already included. " So by getting the temp sensor above the drivers head.....which I must say is more than just a sensor, it has a small fan in there that draws air in over the senser......and by also getting the sunload sensor....I think you'd be pretty close to getting this unit working.

And no worries about bothering me...we're here to help guys like you who want to do things themselve out. I do it cause I like to keep on top of things I don't normally dig into.

d1nonly34

yeah I really appreciate it, luckily the tech at the dealer who worked on my car was cool and I became friends with him. Him and others laughed at what I had been doing with the conversion. As far as that extra wire to the blower motor, apparently I must have it already connected because the fan speeds work perfectly. I already ordered the sunload and incar sensor BUT the incar sensor is going to take a little more time, since my roof/headiner wiring harness is different from what I need. Its fine because I will be installing a factory sunroof so I needed to get the new headliner and harness anyway.

Oldude

Bxutista

do you happen to have a video of he process?? Is it worth it