Howdy Guys,

I have a 2005 C6 that has an engine swap to an LS3 by the previous owner.

I am currently having an issue with what I thought was a burnt out set of indicator bulbs on the front headlights. I replaced both lights and still does not seem to work. I have begun checking fuses and the fuse for that system seems to be working fine. The only thing I have not done at this point is use the multimeter to verify that 12V is going to each indicator light and follow the wires through the vehicle.

Currently, if I turn right or left indicator on, the lights do not turn on and the indicators on the dashboard flash rapidly, as if a bulb is out.

Any ideas?

 

Take the bulb out and look at the harness. If the contacts are black you need to replace the harness. I had to do this on my 05 within my first week of ownership.

 

I hope it's that simple. Ive narrowed it down to a couple of things.

1. Wiring is bad.

2. Receptacle is bad.

3. Ground came loose.

I hope its either 2 or 3

 

I'd be willing to put money on it being the harness. It's pretty easy to change if you can get the wheel off.

 

I assume O' Reilly's will have that kind of part in stock?

 

Hmm, it's doubtful. I bought one from RLSebring on the forum. I might contact him to see if still has them.
http://forums.corvetteforum.com/memb...rlsebring.html

 

Just to clarify, the two front headlight blinkers are on their own circuit and are not connected with the taillights of any other lights on the car, right?

 

When I was having this issue, my DRL/blinkers would not function in the front, but my rear lights and interior indicator would hyperflash due to the lack or resistance from the front bulb. The harness that you are most likely having trouble with is probably 24" long and connects just inside the wheel well.

 

2005 has a known issue with the DRl/Turn Signal sockets over heating and causing problems. I am 99.9% sure the turn signals have their own circuit, Front and Back.

 

My guess would be the wiring harness/socket as well.

There are no fuses for the DRL/Turn Signals (F&R)/Brake Lights.

They are all controlled by the computer so there is no traditional style flasher module.

If one end of the car has a bulb failure, both ends of the car will hyper-flash.

 

Yes, they do.

Z//

 

I'm looking at the schematics and they show that all the lamps (headlamps, taillamps, DRL, turn signals, etc.) are fused in the underhood fuse block.

Z//

 

I stand corrected on the brake lights (stop lamps) but my Owners Manual does not list/show any fuse or relay for the DRL/Turn Signals.

It does show relays and fuses for highs/lows/fogs/parking lights.

Front Parking/Running lights share the same bulb with the DRL/Turn Signal, but two different filaments. One bright (major) and one dim (minor).

My '06 Service Manual shows the turn signal voltage (both L & R) exiting the BCM and passing through the fuse block under the hood and connecting to the lamps, but it does not show any fuse.

The Service Manual also does not list/show a fuse in the diagram/list of the under-hood fuse box.

 

If the 'blinkers' you're referring to are the DRL/Turn signals, of course they share a circuit with the taillights (2nd filament), since BOTH blink when turn signals are activated.

The DRLs are NOT fused separately . They're part of the turn signal circuit, but unfortunately, not fused separately anymore. A lot of us wanted to permanently disable the DRLs, but we couldn't. All we can do is turn them off every freaking time we fire up the engine .

 

I never said they were fused seperately

re: fuse box

I stand corrected. I just assumed that if you bothered to say "it goes through the fuse box" it followed that the circuit was fused. Seems odd NOT to fuse an electrical circuit.

Z//

 

On this topic...

I haven't gone to great lengths to trace the logic but, with the car running, pulling the handbrake on will turn off the DRLs. There might be something to learn from this. Of course, you'd have to find a way to separate the DRL issue from the "sound the alarm because he's starting to drive off with the handbrake on" issue, but maybe...?

Z//

 

Another, but less well known of the 2005 teething and engineering C6 defects. As I recall the wiring harnesses are slightly short. I had mine replaced on warranty after a sudden series of turn signal failures year 3 of ownership.

 

I agree, this is not very intuitive.

The BCM controls the F/R DRL/Turn/Brake lights and can regulate the voltage on the circuits if there is any issue.

The fuses for the stop lamps (brake lights) aren't actually on the lamps themselves but rather the 12V supply to the BCM for that circuit.

There is 1 fuse under the hood for the Backup and Stoplamps combined, and then separate fuses (1 each) for the Backup lights and Brake Lights in the passenger footwell fuse box.

As stated above, this circuit design/arrangement is what make it so difficult/impossible to disable the DRL's or modify the turn signals.

 

Yeah, I learned a lot about all this stuff when I was attempting to figure out how to integrate euro taillamp lenses into the U.S. cars without reprogramming the car and generating all of the undesirable side effects. I have a rough design that I think would work but integrating THAT into the system is a lot more trouble than it's worth unless you can get hold of both the male and female BCM connectors (C3) and the multifunction turn signal switch (C4). With those and a small circuit board w some relays, you can simulate the BCM's Euro rear-end turn signal+brake lamp behavior. But I lost interest - especially when I couldn't find the connectors so I could make my own inline jumpers without having to cut into the stock wiring harnesses. At some point the education alone became enough progress.

Z//

 

2005 Chevrolet Corvette | Corvette VIN Y Service Manual | Document ID: 1680429
#05-08-42-009: Front Park/Turn Signal Bulb Intermittently Inoperative (Check Bulb Operation and Replace Headlamp Wiring Harness, If Necessary) - (Jul 1, 2011)

Condition


Some customers may comment that the left or right or both front park/turn signal bulbs are inoperative. This condition may be intermittent and replacing the bulb may not correct it.
Cause


This condition may be due to a loss of contact between the base of the bulb and the socket.
Correction


Important: Some early versions of the headlamp wiring harness have a section of harness that is not needed for this bulletin. Prior to installing harness to headlamp, disconnect and discard this section.
Check the bulb for correct operation off the vehicle by using a 12-volt power source. If the bulb is found to be inoperative, replace the bulb with a 5702 KA Phillips bulb, P/N 15233607. If the bulb is found to operate out of the socket, then the headlamp wiring harness should be replaced. Remove the headlamp assembly for access to the wiring harness (refer to the Front Headlamp Replacement in SI, Document ID #1507485).
Parts Information




Part Number


Description


19120497


Harness Assembly, Headlamp Wiring