Turn signal flasher

Tiny
M522
  • MEMBER
  • 1996 GMC C1500
V8 two wheel drive automatic 182,000 miles.

Could you tell me where the turn signal flasher is located on my truck? Thanks.

Well my blinkers do not work at all now, but they used to work sometimes and then would not work at other times. Does this sound like it could be a bad flasher?
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Thursday, February 26th, 2009 AT 8:38 PM

14 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
Do the hazard lights still work? The hazards have a separate flasher so if they do not work either than chances are it is not the flasher unit. The flasher is the most common culprit, but sometimes it may also be the signal switch on the column.

Thanks for using 2CarPros. Com!
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Friday, February 27th, 2009 AT 1:54 PM
Tiny
M522
  • MEMBER
Well, I changed the flasher and still no luck. Also, my windshield wipers will only work on high and will sometimes not work at all. I am thinking it might have a bad multi-function switch.
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Friday, February 27th, 2009 AT 6:57 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Yes, that is what I was suspecting as well. The flasher is always the cheapest and easiest route though. Need help replacing the switch? Just let me know and I can post replacement procedures for you.

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Friday, February 27th, 2009 AT 7:00 PM
Tiny
M522
  • MEMBER
That would be great if you would!

Thanks
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Friday, February 27th, 2009 AT 7:15 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Removal:
When performing service around the SIR system components or wiring, the SIR system mustbe disabled. Failure to do so could result in possible air bag deployment, personal injury or unneeded SIR system repairs.
Make sure the switch is in the off position.
Remove the steering wheel (instructions below).
Disconnect the tilt wheel lever by pulling it out.
Remove the knee bolster and the Torx head screws from the lower column cover.
Lower the cover by tilting it down and then sliding it back to disengage the locking tabs.
Remove the Torx head screws from the upper column cover.
Remove the steering column lock set and the upper cover.
Disconnect the wiring harness straps from the steering column wiring harness.
Remove the retainer from Connector Position Assurance (CPA) if equipped.
Disengage the connector from the Brake Transmission Shift Interlock (BTSI) if equipped.
Unplug the gray and black connectors from the bulkhead connector.
Unfasten the Torx head screws from the switch and remove the switch.

((( Exploded view of the multi-function switch-1996-98 C/K series)))


http://www.2carpros.com/forum/automotive_pictures/261618_0900c1528008f604_1.jpg



Installation:
Installation is the reverse of removal but please note the following important steps.

Install the switch. Use a small blade screwdriver to compress the electrical contact and move the switch into position. The electrical contact must rest on the canceling cam assembly.
Fasten the Torx head screws on the switch. Tighten the screws to 53 inch. lbs. (6 Nm).
Install the upper column cover and fasten the column bracket nuts. Tighten the nuts to 22 ft. lbs. (30 Nm).
Install the knee bolster and the steering column cylinder lock. Tighten the column cover Torx screws to 12 inch. lbs. (1.4 Nm).
Install the lower column cover and tighten the Torx screws 53 inch. lbs. (6 Nm).
Make sure the switch is in the off position and install the steering wheel. Refer to this section for this procedure.
Enable the SIR system (if equipped).

Removal of steering wheel:
Disconnect the battery ground cable.
On models equipped with a drivers side air bag, perform the following procedure:
Disable the Supplemental Restraint System (if equipped).
On all but 1996-1998 models equipped with a air bag, unfasten the screws at the rear of the steering wheel.
On 1996-1998 models equipped with a air bag, turn the steering wheel 90 to access the rear shroud holes to the inflator module. Insert a screwdriver in the holes and push the leaf spring to release the pin. Turn the steering wheel 180 to access the remaining shroud holes and using the screwdriver, release the remaining pins.
Tilt the inflator module rearward from the top to access the wiring. Tag and unplug the lead wire from the clip on the module, the lead wire from the clip on the steering wheel and the Connector Position Assurance (CPA) and retainer from the module.
If not equipped with a drivers side air bag, remove the horn pad or button cap and disconnect the horn wires.

Mark the steering wheel-to-steering shaft relationship.
If equipped, remove the snapring from the steering shaft.
Remove the nut from the steering shaft.

Warning:
Don't hammer on the steering shaft!

Remove the steering wheel with a puller.

Installation of steering wheelL:
Install the wheel. The turn signal control assembly must be in the Neutral position to prevent damaging the canceling cam and control assembly. Tighten the nut to 30 ft. lbs. (40 Nm).
Install the horn pad and horn contact (if equipped).
If equipped with a drivers side air bag, install the inflator module as follows:
Attach the lead wire to the clip on the module, the lead wire to the clip on the steering wheel and the Connector Position Assurance (CPA) and retainer to the module.
On 1996-98 models, install the inflator module by pressing it firmly into the steering wheel so that all four notched pins in the leaf spring are fully engaged. Be very careful that you do not pinch any wires.
On all but 1996-98 models equipped with a air bag, install the inflator module and tighten the screws to 27 inch lbs. (3 Nm).
Connect the battery ground cable and enable the SIR system (if equipped).

Let me know if you need further assistance.

Thanks for using 2CarPros.com!
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Friday, February 27th, 2009 AT 7:22 PM
Tiny
KEN
  • ADMIN
Hello,

The flasher is located in the fuse panel under the dash here is a diagram (below) to help you see. FYI

Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken
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Wednesday, January 17th, 2018 AT 1:56 PM
Tiny
JLAROSE
  • MEMBER
  • GMC C1500
My vehicle is a 1996 Chevy Truck 1500 extended cab, 140,000 miles as of now. 5.3L. My left single lights stopped working first, then a small car hit me on the right side of my truck (minior damage, nothing to cry over) and my right flasher didnt work. Continue to drive now my brake lights and my flashers dont work any more. I have checked all the fuses, the fuse relay and the singnal flasher. My cab brake light works so I didnt bother with the brake switch behind the brake pedal. I have also checked all the bulbs, the connetion to the bulbs. My rear lights work in reverse and when I turn on my park and head lights on. What is going on?
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)
Tiny
SERVICE WRITER
  • EXPERT
Sounds like a turn signal switch problem.
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)
Tiny
JLAROSE
  • MEMBER
Thanks for the reply. I forgot to mention that my front signal lights come on just not the rear. My indication that something was wrong was the rapid flasher near my speed indicator. Only the rear lights are not working.
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)
Tiny
SERVICE WRITER
  • EXPERT
Try to work the hazard button stem several times or more, sometimes that flushes out and helps support the bad switch theory. It still sounds like a t/s switch prob. Is there power getting to the rear brake lights?
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)
Tiny
JLAROSE
  • MEMBER
Well I have tried everything that I can come up with. Check the wires for cuts or disconnects, played with the switches. I not sure how to dertemine if power is getting to the brake lights. Can you explain? What I did notice is that I have a u-haul cable connection for my trailer and it indicates with the lights on the plug that everything is working fine. I see the flashers flashing and the brake lights working. I unplugged the trailer connector and attached the primary cable running from the cab to the cable that runs to the rear lights, still no success. My parking lights work in the rear, my reverse lights work, everything but what I mentioned before. I reconnected the u-haul plug assembly and played around with the wires to see if it was the u-haul cable assembly but still no changes to the rear lights. So its not the u-haul plug assembly. Is it possible that it may be a computer thing or what?
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)
Tiny
SERVICE WRITER
  • EXPERT
Check your email for diagrams. This is not a computer thing. You need to have a test light to find where the power stops when the brake pedal is pressed.
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)
Tiny
HLSIMS
  • MEMBER
  • 1994 GMC C1500
I have tail lights, signal lights and flashers but not brake lights. What could be the problem?
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Check the brake switch at the brake pedal bracket there's gonna be 2 wires on it jumping this 2 wires together will cause the light to come On. If not the its not getting power-if so adjust the brake switch. After adjusting it properly and still doesn't come on its defective
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Wednesday, October 24th, 2018 AT 5:39 PM (Merged)

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