Lighting Relays

Hey All

Truck has LED's all around now, hence requiring less power to run the lights. So when i turn on a signal light its flashing ridiculously fast. Just wondering if there's a fix for that? I think there's a relay for the signal lights that I could change? 09 gmc sierra 2500hd duramax

TIA

you need an led flasher, the stock one needs resistance to properly flash.

any idea where i could get this at?

I guess it's not so easy on a newer GM, my bad. checked on the GM truck forums and they are saying you have to wire in before every led turn signal bulb.

really? wow. might not be worth it haha ill check it out. thanks a lot!

Sorry to be a PITA!

so been searching some of the truck forums.. but not finding this direct yet
your saying before every Turn signal LED Bulb? or just for each turn signal relay? Trying to determine how many of these suckers i would need to order :/ Or do you got a link to where you found the original info?

Thanks

If you goto your GM dealer they can get a special VCI number and reprogram you VIN
#07-08-42-006E: Information on BCM Calibrations Available to Restore Bulb Outage Detection on Vehicles Produced by Second Stage Manufacturer, Turn Signals Flash Fast after Factory Box Removed (Upfitter) - (Nov 11, 2010)


Subject: Information on BCM Calibrations Available to Restore Bulb Outage Detection on Vehicles Produced by a Second Stage Manufacturer, Turn Signals Flash Fast after Factory Box Removed (Upfitter)


Models: 2007-2011 Chevrolet Silverado

2007-2011 GMC Sierra






--------------------------------------------------------------------------------

The information contained in this bulletin applies to vehicles that are to be completed by a second stage manufacturer (upfitter) and may need to have the Body Control Module (BCM) rear turn signal bulb outage detection capability changed. All production vehicles will be manufactured with one of the following BCM rear turn signal bulb outage detection software options:

A standard production vehicle will have BCM software that checks for two bulbs functioning in each rear turn signal bulb circuit. If one or more bulbs are inoperative, the BCM will "fast flash" the Instrument Panel Cluster (IPC) turn signal indicator as required by Federal Motor Vehicle Safety Standard (FMVSS) 108 and Canada Motor Vehicle Safety Standard (CMVSS) 108.
Certain 2500 and 3500 models can be ordered with a new option (RPO 9U5) where the BCM checks for one bulb functioning in each rear turn signal bulb circuit. If the bulb goes inoperative, the BCM will "fast flash" the Instrument Panel Cluster (IPC) turn signal indicator as required by Federal Motor Vehicle Safety Standard (FMVSS) 108 and Canada Motor Vehicle Safety Standard (CMVSS) 108.
A vehicle built with a pickup box delete or chassis cab option (RPO ZW9) will be produced with a BCM program that has no turn signal bulb outage detection capability (LED compatible). The IPC turn signal indicator will flash at the same rate no matter how many turn signal bulbs are inoperative.
In some cases, the upfitter may wish to change the turn signal bulb outage detection capability so that the turn signals work correctly with their upfit or to meet certain requirements. This will require contacting the Techline Customer Support Center (TCSC) (1-800-828-6860 English or 1-800-503-3222 French) to open a case and obtain a Vehicle Configuration Index (VCI) number. Advise the TCSC consultant which turn signal bulb outage detection capability is needed:

Factory standard production TWO bulb outage detection.
Optional (RPO 9U5) ONE bulb outage detection. NOTE: ONLY AVAILABLE ON CERTAIN 2007-2011 MODEL 2500 AND 3500 VEHICLES.
NO bulb outage detection (LED compatible).
The BCM can then be reprogrammed with the correct software.

If you goto your GM dealer they can get a special VCI number and reprogram you VIN
#07-08-42-006E: Information on BCM Calibrations Available to Restore Bulb Outage Detection on Vehicles Produced by Second Stage Manufacturer, Turn Signals Flash Fast after Factory Box Removed (Upfitter) - (Nov 11, 2010)


Subject: Information on BCM Calibrations Available to Restore Bulb Outage Detection on Vehicles Produced by a Second Stage Manufacturer, Turn Signals Flash Fast after Factory Box Removed (Upfitter)


Models: 2007-2011 Chevrolet Silverado

2007-2011 GMC Sierra






--------------------------------------------------------------------------------

The information contained in this bulletin applies to vehicles that are to be completed by a second stage manufacturer (upfitter) and may need to have the Body Control Module (BCM) rear turn signal bulb outage detection capability changed. All production vehicles will be manufactured with one of the following BCM rear turn signal bulb outage detection software options:

A standard production vehicle will have BCM software that checks for two bulbs functioning in each rear turn signal bulb circuit. If one or more bulbs are inoperative, the BCM will "fast flash" the Instrument Panel Cluster (IPC) turn signal indicator as required by Federal Motor Vehicle Safety Standard (FMVSS) 108 and Canada Motor Vehicle Safety Standard (CMVSS) 108.
Certain 2500 and 3500 models can be ordered with a new option (RPO 9U5) where the BCM checks for one bulb functioning in each rear turn signal bulb circuit. If the bulb goes inoperative, the BCM will "fast flash" the Instrument Panel Cluster (IPC) turn signal indicator as required by Federal Motor Vehicle Safety Standard (FMVSS) 108 and Canada Motor Vehicle Safety Standard (CMVSS) 108.
A vehicle built with a pickup box delete or chassis cab option (RPO ZW9) will be produced with a BCM program that has no turn signal bulb outage detection capability (LED compatible). The IPC turn signal indicator will flash at the same rate no matter how many turn signal bulbs are inoperative.
In some cases, the upfitter may wish to change the turn signal bulb outage detection capability so that the turn signals work correctly with their upfit or to meet certain requirements. This will require contacting the Techline Customer Support Center (TCSC) (1-800-828-6860 English or 1-800-503-3222 French) to open a case and obtain a Vehicle Configuration Index (VCI) number. Advise the TCSC consultant which turn signal bulb outage detection capability is needed:

Factory standard production TWO bulb outage detection.
Optional (RPO 9U5) ONE bulb outage detection. NOTE: ONLY AVAILABLE ON CERTAIN 2007-2011 MODEL 2500 AND 3500 VEHICLES.
NO bulb outage detection (LED compatible).
The BCM can then be reprogrammed with the correct software.

I pulled this from GMFullsizefourms.

I have led bulbs in my 04 rcsb and I have the hyperflash that goes along with the led's. I bought a EP29L Electronic Flasher Relay to remedy this and I cant figure out for the life of me if this will even work in my truck. Has anyone every used this in an 04+ or will this only work in 03 - previous? The flasher relay in my truck is twice the size of the EP29L?

Any suggestions would be helpful or if you have installed one and could show me the location to install the relay would be awesome. Thanks Guys.