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Johnny21750

Left/Right turn signal indicator failure

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I have a 2014 gmc Sierra and I have left and right turn signal indicator failure. All bulbs are fine and everything works great but I keep getting this message. They will start out blinking normally then a few seconds they flash really fast and this message is displayed but all bulbs are fine. So I hooked my scanner to it and the code that keeps coming up is HVAC controls U1509-00 LIN BUS 9- Malfunction. This has been going on for months and I cannot figure out what’s wrong. I checked all bulbs, fuses and wires. All is fine. Any ideas? 

3496C402-482F-4A1E-AC98-4CBA74185963.jpeg

42A9BBFB-0499-4C96-BA32-FFE00F19F654.jpeg

A4F86EC1-438D-4CE8-B750-0033B7375318.jpeg

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Are you the first owner of this truck? Are the tail lights factory tails? Did you install LED bulbs? Did you install LED tail lights?


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On 9/28/2019 at 6:38 PM, Johnny21750 said:

I have a 2014 gmc Sierra and I have left and right turn signal indicator failure. All bulbs are fine and everything works great but I keep getting this message. They will start out blinking normally then a few seconds they flash really fast and this message is displayed but all bulbs are fine. So I hooked my scanner to it and the code that keeps coming up is HVAC controls U1509-00 LIN BUS 9- Malfunction. This has been going on for months and I cannot figure out what’s wrong. I checked all bulbs, fuses and wires. All is fine. Any ideas? 

3496C402-482F-4A1E-AC98-4CBA74185963.jpeg

42A9BBFB-0499-4C96-BA32-FFE00F19F654.jpeg

A4F86EC1-438D-4CE8-B750-0033B7375318.jpeg

Sounds like aftermarket tail lights.  I have this exact problem and even with the resistors provided, it still happens.

 

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I am the original owner and bought it off the show room floor when it was new. Everything is factory. I have not changed or upgraded a single thing. I checked the trailer plug in and all is fine. Even checked all wiring above the spare tire and followed the wire harness to the fuse box’s. Everything looks as it should. All light bulbs work great but blinks fast after a few seconds and I get that message

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The hyper flash is an indication that a bulb is out or a change in the current draw when turn signals are used.

The bulbs are dual filament. Turn on your park lights. Check that all 4 bulbs are illuminated. Then have someone step on the brakes. Do all 4 bulbs go bright?

If all 4 bulbs are functioning in both park lamp state and brake applied state, then something is causing an difference in the current draw that the BCM is sensing.


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Also, check all 4 bulb sockets corrosion at the tail light location and underneath at the junction box. Corrosion can cause resistance in the line. Clean out any signs of it and apply some dielectric grease.

If that doesn’t work, might be a trip to the dealer.


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15 minutes ago, O_J_Simpson said:

Replace the bulbs.

This had the same thing when my lamps were bad in taillight flasher blinked real fast it was bad lamps

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