Help With 92-93 Stereo / Climate Control VF Display Dimmer - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-18-2003, 02:55 PM   #11
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Just a couple more notes... SSEiguy and I struggled with this one earlier:

http://www.bonnevilleclub.com/forum/...384&highlight=

It only affects the electronic climate controls because the manual climate controls don't have a VF display.

If you look at the troubleshooting areas:

1. The grey wire provides the rheostat signal (0-12V, dim to bright)
2. The green wire provides the headlamps on signal (0 or 12V, depending on headlamps on or off)
3. The purple and white wire provides a unique VF display dimmer signal (12V to 10V, as the rheostat is rotated from dim to bright)

Notice that a 12V signal applied to the purple'white wire will make the VF display turn completely off! I've tried it. The climate control is expecting the pulse-width modulated signal.

However, in 94, they changed the radio display from VF to a back-lit LCD display, but it appears that the climate control didn't change. Or did it? Is the climate control dimmer now self-contained, or is it simply wired differently?

I am working on getting the 94 wiring diagram, and also checking the part numbers on the 93 and 94 climate controls to see if they match.
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Old 02-18-2003, 03:40 PM   #12
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Those controls are broken down into 3 part numbers from 92-99.

These are shared:

92/93
94/95
96-99
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Old 03-06-2003, 09:47 PM   #13
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I now have the 93 and 94 electrical service manuals. The infamous purple and white wire in pin No. 2 disappears in the 94 model! In its place is a yellow wire in pin No. 10. Pins 4 and 5 switch places.

I am going to try to wire in the "headlamps on" signal to my climate control at pin 10. If I don't get a VF display response, I will replace my climate control with a 94 model.

I'll keep you posted (if anyone cares! )
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Old 03-07-2003, 11:39 AM   #14
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Quote:
Originally Posted by fuddyduddy121
However, in 94, they changed the radio display from VF to a back-lit LCD display, but it appears that the climate control didn't change. Or did it?
From the user'* perspective: The '93 has red/orange backlighting everywhere, but all the vacuum fluorescent displays (compass, DIC, HVAC, stereo) are blue-green. Later models, maybe starting with the '94 change you mentioned, have red/orange displays which match the backlighting.

I _love_ the dashboard display in the '93, because the contrasting color of the VF displays really makes them stand out. I _always_ get oohs and aahs from people who get into the car for the first time at night. (Almost everyone immediately says that it looks like an airplane cockpit.) I have yet to find a car with a nighttime dash display that'* cooler than this one.
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Old 03-07-2003, 12:14 PM   #15
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Quote:
Originally Posted by acg_ssei
Quote:
Originally Posted by fuddyduddy121
However, in 94, they changed the radio display from VF to a back-lit LCD display, but it appears that the climate control didn't change. Or did it?
From the user'* perspective: The '93 has red/orange backlighting everywhere, but all the vacuum fluorescent displays (compass, DIC, HVAC, stereo) are blue-green. Later models, maybe starting with the '94 change you mentioned, have red/orange displays which match the backlighting.

I _love_ the dashboard display in the '93, because the contrasting color of the VF displays really makes them stand out. I _always_ get oohs and aahs from people who get into the car for the first time at night. (Almost everyone immediately says that it looks like an airplane cockpit.) I have yet to find a car with a nighttime dash display that'* cooler than this one.
Funny you should mention that...I get they SAME responses...you have to admit...as fas as cockpit lighting is concerned...the 93 SSEi is SUPERIOR...IMO
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Old 03-08-2003, 05:28 PM   #16
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Yeah, in 94 the radio became all red. Then in 2000 the Bonneville lost the remaining VF displays on the compass, DIC, and climate control.

I like the VF displays.
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Old 03-08-2003, 08:11 PM   #17
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I'll have to agree here. The combination of displays and colors that the 93 has is superior.
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Old 03-20-2003, 11:33 PM   #18
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I tried wiring the "headlamps on" signal to pin 10 of the existing climate control to no avail. At that point I ordered a 1994 control head.

I installed it today, and Voila! The dimming capability is back. I wired the existing climate control harness to accept a 1994 control head, which has its own VF dimming capability, yet would still work with the existing HVAC programmer. In addition to the pin 10 wire, pins 4 and 5 had to be reversed.

Here is some part info that I dug up while doing the research:

HVAC control heads:

92, 93 - 16160288
94 - 16201124
95-99 - 16220102

HVAC programmers:

92 - 16183308 or 16183312
93 - 16190465
94 - 16197178
95-99 - 16218972

I'll have to post a techinfo procedure for the complete installation of a newer stereo into the 92-93 models. I will take some pictures soon.

This should close this thread out, finally.
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Old 03-21-2003, 01:48 AM   #19
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Way to go. Glad you stuck with that one. What was the total $$ damage for this go-around?
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Old 03-21-2003, 02:19 PM   #20
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Lets see.

Stereo from 2001 Trans Am - $165
New Climate Control Head - $125
Misc. Wiring Harnesses - $5
1994 Serice Manual / Wiring Diagram - $20
Old Radio in trunk (not used anymore) - $10

I don't even want to add it up, because I could have found a 92-93 CD player for around $225.
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