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Gentex Mirror Wiring Diagram


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miatapaul 
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Member spacespace
Joined: January 11, 2004
Location: United States
Posted: January 11, 2004 at 6:46 PM / IP Logged  
These are the wire colors on my 5 Wire Gentex GNTX-115 and how I hooked them up. The harness plug is 7 pin but only 5 are used. Its auto-dimming with maplights. All features of the mirror work this way. Well I didn't care to do the reverse/turn off feature.
black: ground
orange: always on +12volt
blue: door open ground
pink: ignition +12volt
light green: reverse lamp +12volt
jybwatson 
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Member spacespace
Joined: January 15, 2004
Location: United States
Posted: January 21, 2004 at 11:07 AM / IP Logged  

I bought a Gentex 126 from a 1995 Cadillac Deville Concours, 4 door sedan that did not have a wiring harness.

It has two plugs on the back,

1. Center bottom with 3 prongs. the left one has an H and a 1, the far right plug in numbered 3, doesn't seem to have anything on the center prong.

2. Almost center of mounting bracket with 2 prongs, numbered 1 (left) 2

(right)

Both sets of prongs has JST or J8T on them

All I need is the wiring for the mirror to work, no other features are needed, even though I do not believe it has any other features.

jybwatson 
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Member spacespace
Joined: January 15, 2004
Location: United States
Posted: January 21, 2004 at 11:12 AM / IP Logged  
jybwatson wrote:

I bought a Gentex 126 from a 1995 Cadillac Deville Concours, 4 door sedan that did not have a wiring harness.

It has two plugs on the back,

1. Center bottom with 3 prongs. the left one has an H and a 1, the far right plug in numbered 3, doesn't seem to have anything on the center prong.

2. Almost center of mounting bracket with 2 prongs, numbered 1 (left) 2

(right)

Both sets of prongs has JST or J8T on them

All I need is the wiring for the mirror to work, no other features are needed, even though I do not believe it has any other features.

I am wanting to install this in a 1997 Pontiac Grand Prix

earlybroncoguy 
Member - Posts: 4
Member spacespace
Joined: January 21, 2004
Location: United States
Posted: January 21, 2004 at 2:01 PM / IP Logged  

I also have a Gentex 26 16 pin Onstar mirror from eBay, but no diagram. Here's the pinout data I got from a really helpful GM employee on the Grassroots Motorsports BBS:

Pins 1-4 are not used

5 is an auto day/night signal, which comes from the LH outside rearview
mirror
6-7 are not used (on my mirror, but are the temp probe connection on others)
8 is ground
9 is supply voltage from back-up supply (I guess so Onstar will still work in the event that the vehicle battery is disabled in an accident)
10 is not used
11 is keypad signal (out) for On-star (pressing any button puts out a 5v multiplxed signal on this pin, - so you can't just use the buttons to control whatever you want to, sorry) 
12 is keypad supply (5v) voltage (in) for the buttons
13 is ignition voltage (12v -main power IN to the mirror)
14 keypad green LED signal
15 Keypad red LED signal
16 is the return line to the LH outside mirror for day/night signal

earlybroncoguy 
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Member spacespace
Joined: January 21, 2004
Location: United States
Posted: January 21, 2004 at 2:32 PM / IP Logged  

[

 After reading all the other posts in this thread and comparing the wiring data, here's a more complete list: 

Pin 1-not used

2 - Microphone (if the mirror is equipped with it)

3 - "Passenger Air Bag on" notification (if mirror is equipped with that display)

4. - "Passenger Air Bag off" notification (if mirror is equipped with that display)

5 - auto day/night signal, which comes from the LH outside rearview mirror

6 - Temp probe connection ( if mirror is equipped with display)

7 - Temp probe connection (if mirror is equipped with display)

8 -  Ground

9 -  one source says it's a Reverse Dim Inhibit signal so the mirror will not dim when the vehicle is in reverse, another says it's a supply voltage from a back-up supply (I guess so Onstar will still work in the event that the main evehicle battery is disabled in an accident). I'm pretty sure if 12v is applied to this pin, the mirror will not dim no matter what.

10 - Microphone (if mirror is equipped) 

11- keypad signal (out) for On-star (pressing any button puts out a 5v multiplexed signal on this pin, - so you can't just use the buttons to control whatever you want to. Sorry.)

12 - keypad supply (5v) voltage (in) for the buttons

13 - ignition voltage (12v -main power IN to the mirror)

14 - keypad green LED signal

15  - keypad red LED signal

16 - return line to the LH outside mirror for day/night signal

auex 
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Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
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Posted: January 21, 2004 at 9:33 PM / IP Logged  
Wow, return of the never-ending post.
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earlybroncoguy 
Member - Posts: 4
Member spacespace
Joined: January 21, 2004
Location: United States
Posted: February 10, 2004 at 6:12 PM / IP Logged  

Apparently posts can't be edited, so I'll update my last one with a few things I've found out since I posted it.

earlybroncoguy wrote:

[

 After reading all the other posts in this thread and comparing the wiring data, here's a more complete list: 

Pin 1-not used

2 - Microphone (if the mirror is equipped with it)

3 - "Passenger Air Bag on" notification (if mirror is equipped with that display) - ground pin to activate icon

4 - "Passenger Air Bag off" notification (if mirror is equipped with that display) - ground pin to activate icon

5 - auto day/night signal, which comes from the LH outside rearview mirror

6 - Temp probe connection ( if mirror is equipped with display)

7 - Temp probe connection (if mirror is equipped with display)

8 -  Ground

9 -  After taking a mirror apart and experimenting, I've discovered that pin 9 is common with pin 8 - they are both soldered directly to the ground plane on the circuit board. So, it's a ground.

10 - Microphone (if mirror is equipped) 

11- keypad signal (out) for On-star - pressing any button puts out a multiplexed signal on this pin, - so you can't just use the buttons to control whatever you want to. Sorry.

  Update - Well, yes you can, if you do a little rewiring (arghh, arghh!). The 3 Onstar system buttons across the bottom of the mirror are rubber covers over membrane-type switches. The switches are actually part of the circuit board itself, but if you're VERY, VERY careful you can use an X-acto knife to cut the traces on the board from the trace ring land on the output side of the switch to the surface-mounted components. Then VERY, VERY carefully solder a small wire from the ring land to one of the unused pins on the back of the wiring connector for each switch (not the power switch, though - leave that one alone.) The input of the switches are all common to the main ground plane of the circuit board, so now when you press any of the switches you'll be sending a ground to whatever connector pin you soldered that switch's wire to. You can use this switched ground to activate the ground side of any relay, thus controlling nearly function on the car by touching one of the mirror-mounted buttons. They are momentary, though, so you'll need to wire in a latching circuit if you want that function to be constant on. 

There are also led's under each button which are normally only on whenever that function of the Onstar system is activated - but they can be hardwired to the kepad's 5v supply and grounded from other unused pins on the wiring connector if you want by employing the same rewiring technique above. They could be wired so that they only come on when the vehicle' s dash lights are on so they're easy to find at night.   

12 - keypad supply (5v) voltage (in) for the buttons

13 - ignition voltage (12v -main power IN to the mirror)

14 - Green LED signal (to the right of the Emergency button) - apply 12v to light LED.

15  - Red LED signal (to the right of the Emergency button) - apply 12v to light LED.

16 - return line to the LH outside mirror for day/night signal

Superdawg 
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Member spacespace
Joined: February 15, 2004
Posted: February 15, 2004 at 9:44 PM / IP Logged  

I just picked up a gentex mirror (not sure of model number) from a cadillac eldorado.  It has a three wire connection to it.  I do'nt know what is what.  It looks like, on the circuit board, it says + G and T.  What do I connect to where, for the mirror to work properly?  I am thinking + is constant 12V, G is 12V -, and T I don't know what that is.

Thanks in advance.

gdoug 
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Joined: April 07, 2003
Location: United States
Posted: February 15, 2004 at 9:58 PM / IP Logged  
That might be an input for the transmission. The mirrors have a feature that disables the auto-dim function when the transmission is in reverse. I didn't bother hooking that one up on mine. Power and ground is all I used.
Superdawg 
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Member spacespace
Joined: February 15, 2004
Posted: February 15, 2004 at 9:59 PM / IP Logged  
It works like that, with no problems?
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