headlight module
Thread Starter
3rd Gear
Joined: Apr 2015
Posts: 3
Likes: 0
headlight module
my head lights stopped going up or down a few months ago. I finally got tired of manually cranking them up and down so I started the diagnostic process. I have done a lot of research on the pop up headlights trying to diagnose if my module or headlight switch has gone bad on my car. I cant find a decent wiring schematic that gives pin-outs for the C1 connector that connects to the module. with headlights on, pin C on the C1 connector goes to open, is this correct? I would assume it should switch to ground. A and C reversing to tell module to lower the lights?
Pin A and C are not shown on the wiring diagram I am finding.
C1 headlights off
A - ground
B - Power
C - Power
D - Ground
E - Power
C1 headlights off
A - power
B - Power
C - open (nothing)
D - Ground
E - Power
Pin A and C are not shown on the wiring diagram I am finding.
C1 headlights off
A - ground
B - Power
C - Power
D - Ground
E - Power
C1 headlights off
A - power
B - Power
C - open (nothing)
D - Ground
E - Power
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Not at home with my schematics.
I assume your second set of readings is with headlights ON, not OFF?
Also, are your readings with the connector still connected to the module?
If you have Twilight Sentinel and activate it from the DIC do they work in the dark?
You can cover the light sensor at the left side of the drivers side defroster vent to test in the daylight.
I assume your second set of readings is with headlights ON, not OFF?
Also, are your readings with the connector still connected to the module?
If you have Twilight Sentinel and activate it from the DIC do they work in the dark?
You can cover the light sensor at the left side of the drivers side defroster vent to test in the daylight.
Race Director
Joined: Mar 2008
Posts: 12,413
Likes: 502
From: Rio Rancho NM
hope this helps...it's free to do so you can eliminate the issue. You sure it's not the nylon gear that took a crap?
https://www.corvetteforum.com/forums...f-replace.html
https://www.corvetteforum.com/forums...f-replace.html
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
Everything going into the module checks out OK. There are 2 schematics for the door controls. Here is the info.
C1 headlights off
A - ground (this is the On input and is correct)
B - Power (always Hot)
C - Power (this is the OFF input and is correct)
D - Ground (always ground)
E - Power (always Hot)
C1 headlights ON
A - power (this is the On input and is correct)
B - Power (always Hot)
C - open (nothing) (this is the OFF input and is correct)
D - Ground (always ground)
E - Power (always Hot)
Hope this helps.
C1 headlights off
A - ground (this is the On input and is correct)
B - Power (always Hot)
C - Power (this is the OFF input and is correct)
D - Ground (always ground)
E - Power (always Hot)
C1 headlights ON
A - power (this is the On input and is correct)
B - Power (always Hot)
C - open (nothing) (this is the OFF input and is correct)
D - Ground (always ground)
E - Power (always Hot)
Hope this helps.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
PS: I meant to mention I would have expected in "OFF" the A pin to be open and not ground. Kind of what happens in "ON". With that said there are some lighting circuits upstream of that circuit that could account tor a resistance reading but not ground.
I think if they will not go up that there is NOT an issue with anything "up to" the module.
If you are not using an ohmmeter to measure the circuit that might account for what you got.
If I need to check the same with my car I can do it in the next day or two. It is at my warehouse and not at home.
I think if they will not go up that there is NOT an issue with anything "up to" the module.
If you are not using an ohmmeter to measure the circuit that might account for what you got.
If I need to check the same with my car I can do it in the next day or two. It is at my warehouse and not at home.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski