My headlights pop up and come on in my garage where the twilight opt takes over but if I try to do it manually no luck. Any suggestions? They work fine when they are up just have to wait for dust...
Thanks

 

Here's the troubleshooting guide

The twilight sentinel operates on a different circuit so its not a surprise that auto works but manual doesn't.

From what you say I'd suspect the headlight switch. It fails quite often.

Document ID# 661511
2002 Chevrolet Corvette
________________________________________
Headlamp Door(s) Inoperative
Step Action Yes No
Schematic Reference: Headlight Doors Schematics

1 Did you perform the Diagnostic System Check? Go to Step 2
Go to Diagnostic System Check - Lighting Systems

2 Turn the headlamps ON and OFF.
Do the headlamp doors open and close? Go to Testing for Intermittent and Poor Connections in Wiring Systems Go to Step 3

3 Is only one headlamp door inoperative? Go to Step 9
Go to Step 4

4 Are the headlamp doors closed at all times? Go to Step 5
Go to Step 7

5 1. Remove the right hand headlamp assembly.
2. Disconnect the control module connectors C1 and C2 to the actuator for the headlamp opening door.
3. Turn the headlamps ON.
4. Connect a test lamp between the headlamps ON input circuit and a known good ground at connector C1. Refer to Circuit Testing in Wiring Systems.
Does the test lamp illuminate? Go to Step 6
Go to Step 13

6 Connect a test lamp between the headlamps ON input circuit and the ground circuit of connector C1.
Does the test lamp illuminate? Go to Step 11
Go to Step 14

7 1. Turn OFF the headlamp switch.
2. Disconnect the actuator control module to the headlamp opening door.
3. Using a test lamp, probe between the headlamp OFF input circuit and ground.
Does the test lamp illuminate? Go to Step 8
Go to Step 11

8 1. Disconnect connector C209.
2. Using a test lamp, probe between the headlamp OFF input circuit (female side) and ground.
Does the test lamp illuminate? Go to Step 12
Go to Step 15

9 Test the power and ground circuit of the headlamp door control for a poor connection or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 19
Go to Step 10

10 Inspect the harness connector for headlamp opening door assembly for a poor connection. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and complete the repair? Go to Step 19
Go to Step 16

11 Inspect the harness connector for headlamp opening door actuator control module for a poor connection. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and complete the repair? Go to Step 19
Go to Step 17

12 Inspect the harness connector for multifunction turn signal lever for a poor connection. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and complete the repair? Go to Step 19
Go to Step 18

13 Repair a poor connector or an open in the headlamp ON input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair? Go to Step 19
--
14 Repair a poor connector or an open in the ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair? Go to Step 19
--
15 Repair a short to battery positive voltage in the headlamps OFF input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair? Go to Step 19
--
16 Replace the headlamp opening door assembly. Refer to Headlamp Opening Door Replacement .
Did you complete the replacement? Go to Step 19
--
17 Replace the control module for the headlamp opening door actuator. Refer to Headlamp Control Module Replacement .
Did you complete the replacement? Go to Step 19
--
18 Replace the multifunction turn signal lever. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt.
Did you complete the replacement? Go to Step 19
--
19 Operate the system in order to verify the repair.
Did you correct the condition? System OK Go to Step 2

________________________________________
Document ID# 661511
2002 Chevrolet Corvette

 

This might help.

 

It's much easier- for me at least.

It's a grounding issue. Just open the hood, and start wiggling the grounding block on the passenger side. The ground near the passenger headlight, on the frame rail. My grounds are so flakey, I keep a screwdriver with me to poke/move the grounding block around to get things to work.

I've taken the grounds completely apart 3 times, cleaned, dielectric greased, etc and it still has problems. I've just accepted it's never going to work correctly.

 

If the ground was bad, it wouldn't work with the twilight opt, I don't think. Troubleshooting with the schematics and voltmeter will probably find a bad multifunction switch. That's just a guess, could be any number of things, but proper trouble shooting will find it without throwing parts at it.

 

Thanks all I will try all suggestions and let you know. Just got back from Afghan so I had a long honey do list...
Thx

 

 

Sure sounds like the headlamp switch itself. You can repair or replace it easily.