Ok,I go out for a quick ride tonite before dark and all is well,im heading home,turn my headlights on and i noticed both directional indicators on the dash are illuminated,never seen this before,so i get home,do the usual,check the codes and these are the only 2 that came up current-


DTC B2578 Right Front Turn Signal Monitor Circuit
DTC B2583 Left Front Turn Signal Monitor Circuit

Anyone have any idea what this means or how to go about repairing?My daytime running lights work fine and so do the directionals,once i turn my headlights on,the directionals barely blink and both left and right directional indicator lights are lit on the dash

 

Are you running aftermarket lights in your headlights? I'm not an electrician, but I'd check the grounds to sure they look good.

Also, have you done anything to the car recently? That could have triggered this issue, too.

 

I agree. Haven't heard of the inside indicators being both stuck on before. If you lights are all stock, then as a dumb thought, try cycling the hazard switch a few times and see if anything changes. Past that, maybe a problem with the headlamp switch. As mentioned, the ground packs at the right and probably left forward frame rails adjacent to the hood risers. Make sure they are clean and tight.

 

Sounds like your hazard switch is failing. It's a common problem on c5's. Both signals run through the hazard.

If pushing the hazard button a few times doesn't help, hit the dash with your fist (hard) a few times just above the switch. I've heard of that helping although in the end you will want make plans for the switch.

 

Thats exactly what it is

 

DTC B2578
Circuit Description
The BCM monitors the RF turn signal circuit in order to determine the status of the turn signal switch. If the BCM detects an oscillating voltage on the RH turn signal monitor circuit, the BCM interprets this as a RF turn signal ON request from the turn signal switch. The BCM will then de-energizetheRH DRL relay, which will disable the RF turn signal lamp (which is ON forthe DRL), this allows the RF turn signal to flash. If the BCM does not detectan oscillating voltage on the RH turn signal monitor circuit, the BCM interpretsthis as the RF turn signal being OFF. The BCM will then energize the RH DRLrelay and continue normal DRL operation. The BCM monitors the RH turn signalmonitor circuit and determines how long voltage is applied.If the voltageis applied for longer than expected, a malfunction is presentand a DTC willset.

Conditions for Setting the DTC
The BCM detects continuous battery positive voltage on the RH turn signal monitor circuit.
The condition must be present for longer than 5 seconds.
Action Taken When the DTC Sets
Stores a DTC B2578 in the BCM memory.

Conditions for Clearing the DTC
This DTC requires an ignition cycle in order to change from current to history.
The BCM no longer detects continuous battery positive voltage on the RH turn signal monitor circuit for longer than 5 seconds.
A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
Use the IPC clearing DTCs feature.
The BCM receives the Clear Code command from the scan tool.
Diagnostic Aids
The following conditions may cause an intermittent malfunction:
There is an intermittent short to battery positive voltage in the RH turn signal monitor circuit.
The turn signal switch or the hazard switch is internally shorted or is sticking.
The BCM needs to detect voltage oscillations on the RH turn signal monitor circuit in order to de-energize the RH DRL relay. If the BCM detectscontinuous voltage on the RH turn signal monitor circuit, the BCM interpretsthis as a short to battery positive voltage. The BCM will continue with normal DRL operation, and the RF turn signal will remain inoperative.
If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This canoften cause the malfunction to occur. Refer to Testing for Intermittent and Poor Connections in Wiring Systems.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.

Tests if a DTC B2583 is stored in the BCM. If both the RH and LH turn signal monitor DTCsare stored, test the hazard switch and related circuits for a short tovoltage.

Tests if the BCM is receiving oscillating voltage on the RH turn signal monitor circuit.If the test lamp is ON steady, the BCM will set a DTC B2578.

Tests if the BCM is receiving oscillating voltage on the RH turn signal monitor circuit.If the test lamp is ON steady, the BCM will set a DTC B2578.

Tests if the turn signal switch or related circuits are shorted to voltage.

Tests if the hazard switch or related circuits are shorted to voltage.

Tests if the instrument panel cluster turn signal indicator is shorted to voltage.

Tests if the body control module is shorted to voltage.

Step
Action
Yes
No

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference: Master Electrical Component List

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

2
Install a scan tool.
Turn ON the ignition, with the engine OFF.
Select the BCM display DTC function on the scan tool.
Does the scan tool display DTC B2583?
Go to Step 10
Go to Step 3

3
Turn OFF the ignition.
Disconnect the RH DRL relay.
Turn ON the ignition, with the engine OFF.
Probe the RH turn signal monitor circuit at the RH DRL relay with a test lamp that is connected to a good ground. Refer to Power Distribution Schematics in Wiring Systems for electricalcenter circuit identification.
Turn ON the RH turn signals
Does the test lamp turn ON and OFF with the RH turn signals?
Go to Step 13
Go to Step 4

4
Does the test lamp remain illuminated?
Go to Step 5
Go to Turn Signal Lamps and/or Indicators Inoperative

5
Disconnect the turn signal switch.

Does the test lamp remain illuminated?
Go to Step 6
Go to Step 9

6
Disconnect the hazard switch.

Does the test lamp remain illuminated?
Go to Step 7
Go to Step 10

7
Disconnect the instrument panel cluster.

Does the test lamp remain illuminated?
Go to Step 8
Go to Step 11

8
Disconnect the body control module.

Does the test lamp remain illuminated?
Go to Step 12
Go to Step 14

9
Repair a short to battery positive voltage in the turn signal switch circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 15
--

10
Repair a short to battery positive voltage in the hazard switch circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 15
--

11
Repair a short to battery positive voltage in the instrument panel turn signal indicator circuit. Refer to Wiring Repairs in WiringSystems.

Did you complete the repair?
Go to Step 15
--

12
Repair a short to battery positive voltage in the turn signal monitor circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 15
--

13
Replace the RH DRL relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?
Go to Step 15
--

14

Important
Perform the BCM reprogram procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.


Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?
Go to Step 15
--

15
Use the scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Setting the DTC as specified in the supporting text.
Does the DTC reset?
Go to Step 2
System OK

 

 

Ok,heres what ive got as far as aftermarket lighting,I have hid headlights and foglights,along with led taillights and DRL led.Everything has been working as it should,the only thing i did different before i experienced this last nite was put in the third brake light pulser made my web electric products,i will try disconnecting that first,then try the hazard trick,followed by removing the load protectors at the DRL socket and see where it gets me,thanks for the replies,ill keep you guys posted!

 

SUPERSTAR,YOU ALWAYS SEEM TO AMAZE ME!Well,as it turned out to be was the led protectors were shorted out,i removed them and reconnected the wires and everything works fine,gonna order 2 more led load protectors and go from there,thanks again,and special thanks to Tim!

 

Lord!!!

Who would have known your Corvette was an aftermarket Christmas tree?!

Maybe that should have been mentioned straight away?
I thought it was stock, hence the hazard switch guess... Good lord

 

Anytime...



Tim

 

LOL,You think mine lights up like a christmas tree.........Tstars vette puts the light show in Disney World to shame!

 

 

There you go with crazy talk! Like you started up that crack habit again....

Tim

 

Naahh,I just admire your work bud!!!!!!!!!!!!!!!!

 

Why don't you just bypass the flasher and be done with it? If those LED substitute loads shorted once then why repeat that exercise? DIY is cheaper than those substitute loads anyways.

Peter

 

If I can find the damn connectors I'll make my own, of course I'll probably just splice into the wiring harness knowing me! I want to install a different flasher to slow down my sequential tail lights a tad...

Tim

 

I spoke with Tracey at autoillumination.com and explained to him the issue,being i purchased the 48 led SMT bulb with patented circuitry,i shouldnt have a problem with them not working without the load protectors,as of right now everything works the way it should,no issues,the only thing i did to accomodate the led changes to the DRL and taillights was installed an led flasher a while back to fix the hyperflashing,although,those who did do this,the hazards still hyperflash,no biggy to me.If you have the sequentials and led taillights and the cycle is quite rapid,webelectric products swapped my sequential harnesses for those that were redesighed to accomodate led taillights and made a noticable difference in slowing down the cycling,hope this all helps!

 

I kept my stock taillights, I think they look better with the sequentials... It isn't all about who has the most LEDs ya know?

Tim

 

PLEASE tell me yout joking?????????? Im kidding,lol,i know it isnt about the leds,its about who has the BRIGHTEST ones,lol