Turn Signal Codes
Thread Starter
Race Director
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From: Phoenix area, AZ
Turn Signal Codes
My car started throwing 2578 and 2583 codes recently (these are the turn signal codes and I've seen them as both H and C and it is intermittent), and after doing some extensive reading I've found that this could be the result of a problem with either the multi-function switch or the hazard switch.
Does this sound like an accurate assessment, and how do I eliminate one or the other as a possibility so I know which I need to fix?
Does this sound like an accurate assessment, and how do I eliminate one or the other as a possibility so I know which I need to fix?
Last edited by Corvette_Ed; Aug 28, 2012 at 08:52 PM.
Tech Contributor
Joined: May 2008
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Another Forum member mentioned being almost out of turn signal fluid, in a recent thread.
http://forums.corvetteforum.com/c5-t...or-clutch.html
http://forums.corvetteforum.com/c5-t...or-clutch.html
Thread Starter
Race Director
Joined: May 2012
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From: Phoenix area, AZ
Flasher appears to work just fine, and I haven't actually seen the signals working strangely. I just pulled the codes the other day and saw a history on the 2583 and a current on the 2578. I double checked everything last night and all appears to be working just fine, but something has to be causing the codes to appear.
Thread Starter
Race Director
Joined: May 2012
Posts: 15,763
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From: Phoenix area, AZ
Another Forum member mentioned being almost out of turn signal fluid, in a recent thread.
http://forums.corvetteforum.com/c5-t...or-clutch.html
http://forums.corvetteforum.com/c5-t...or-clutch.html
Safety Car
Joined: Sep 2008
Posts: 4,754
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From: Youngsville North Carolina
maybe you've seen these already:
http://forums.corvetteforum.com/c5-t...o-voltage.html
http://forums.corvetteforum.com/c5-s...and-b2583.html
http://forums.corvetteforum.com/c5-t...o-voltage.html
http://forums.corvetteforum.com/c5-s...and-b2583.html
Thread Starter
Race Director
Joined: May 2012
Posts: 15,763
Likes: 3,281
From: Phoenix area, AZ
maybe you've seen these already:
http://forums.corvetteforum.com/c5-t...o-voltage.html
http://forums.corvetteforum.com/c5-s...and-b2583.html
http://forums.corvetteforum.com/c5-t...o-voltage.html
http://forums.corvetteforum.com/c5-s...and-b2583.html
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From: Plano Texas
Oldtimer
Go to post #6 in the following thread:
http://forums.corvetteforum.com/c5-g...-baffeled.html
There is a pdf with schematics of the Turn Signal Monitor circuit and some diagnostic steps that may point you in the correct direction
http://forums.corvetteforum.com/c5-g...-baffeled.html
There is a pdf with schematics of the Turn Signal Monitor circuit and some diagnostic steps that may point you in the correct direction
Thread Starter
Race Director
Joined: May 2012
Posts: 15,763
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From: Phoenix area, AZ
Go to post #6 in the following thread:
http://forums.corvetteforum.com/c5-g...-baffeled.html
There is a pdf with schematics of the Turn Signal Monitor circuit and some diagnostic steps that may point you in the correct direction
http://forums.corvetteforum.com/c5-g...-baffeled.html
There is a pdf with schematics of the Turn Signal Monitor circuit and some diagnostic steps that may point you in the correct direction
Thanks again, you are helpful as always. This will help me figure out where the problem lies.
Race Director
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From: South Western Ontario
It's odd you think the signals always work yet the codes appear. Basically, the signal wires from the signal switch to the circuit for the front lights are monitored. If either stays on more than 5 seconds you get the corresponsing code. The wires are the lt blu and dk blu at the multi-function switch connector pins F & G or triangles D and B as shown in this schematic. Those 2 wires go into the circuits shown in that pdf in the thread PUMP posted.
Last edited by lionelhutz; Aug 29, 2012 at 12:30 PM.
Thread Starter
Race Director
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From: Phoenix area, AZ
It's odd you think the signals always work yet the codes appear. Basically, the signal wires from the signal switch to the circuit for the front lights are monitored. If either stays on more than 5 seconds you get the corresponsing code. The wires are the lt blu and dk blu at the multi-function switch connector pins F & G or triangles D and B as shown in this schematic. Those 2 wires go into the circuits shown in that pdf in the thread PUMP posted.
Race Director
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From: South Western Ontario
Hmm, the code appeared while driving down a road without you signalling? Or, you checked for the codes while driving down the road and found them but they could have been generated during some turning or stopping you were just previously doing? Do these codes even cause a CEL or sevice warning? If it's happening when just going down a road then it would indicate you have some kind of short on those wires to a power source.
I believe the dash indicators tap off those wires as well, so you should be seeing them stay on for a 5 second interval to get the code. I'm not positive though, I'd have to search for wiring diagrams to find the exact source of the indicators. They typically come of the front turn signal wiring though and they can't come off the bulb side of the relay because they'd be on with the DRL. They can't come off the rear wiring because they'd come on with the brake lights. So, the only place to tap power for the indicators is those 2 wires.
I believe the dash indicators tap off those wires as well, so you should be seeing them stay on for a 5 second interval to get the code. I'm not positive though, I'd have to search for wiring diagrams to find the exact source of the indicators. They typically come of the front turn signal wiring though and they can't come off the bulb side of the relay because they'd be on with the DRL. They can't come off the rear wiring because they'd come on with the brake lights. So, the only place to tap power for the indicators is those 2 wires.
Tech Contributor
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
The first place I would look for that intermittent wiring short, is the lamp sockets and wires in the corner housings.
The DRL's generate a lot of heat! The lamp sockets, and the insulation on their wires, will often melt and short out over time.
The heat from the bulbs will also melt the area just above them, on the plastic corner housings, which can allow water intrusion into the housing, which can cause an electrical short in the bulb sockets.
Thread Starter
Race Director
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From: Phoenix area, AZ
No, nothing to indicate a problem other than the DIC codes. If I hadn't checked for codes I would never have known the problem existed.
If it's happening when just going down a road then it would indicate you have some kind of short on those wires to a power source.
I believe the dash indicators tap off those wires as well, so you should be seeing them stay on for a 5 second interval to get the code. I'm not positive though, I'd have to search for wiring diagrams to find the exact source of the indicators. They typically come of the front turn signal wiring though and they can't come off the bulb side of the relay because they'd be on with the DRL. They can't come off the rear wiring because they'd come on with the brake lights. So, the only place to tap power for the indicators is those 2 wires.
I believe the dash indicators tap off those wires as well, so you should be seeing them stay on for a 5 second interval to get the code. I'm not positive though, I'd have to search for wiring diagrams to find the exact source of the indicators. They typically come of the front turn signal wiring though and they can't come off the bulb side of the relay because they'd be on with the DRL. They can't come off the rear wiring because they'd come on with the brake lights. So, the only place to tap power for the indicators is those 2 wires.
Thread Starter
Race Director
Joined: May 2012
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From: Phoenix area, AZ
What does that mean in layman's terms? Is this something I have the possibility of working on without needing to get the car in the air to get underneath? If I have to get underneath I have no choice but to wait until I get home in the next week or so.
Race Director
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From: South Western Ontario
It means that with the DRL's on that power should not be back feeding into the 2 wires that are monitored.
Tech Contributor
Joined: May 2008
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
And this (which is misquoted btw) is supposed to be helpful how? If you don't want to help because I haven't had the time nor the money to buy shop manuals yet just say so. Acting like a dick doesn't help anyone, including your own reputation. I'm 1100 miles away from home and having troubles, I don't need the attitude.
The reference to "getting low on turn signal fluid", in the thread that I linked to, was meant to be humorous. Most others here would certainly see it that way, and get a good chuckle when reading it.