Turn signals do not work?

Q’S RIDE

MEMBER
2004 GMC SAVANA
5.7L
V8
2WD
AUTOMATIC
150,000 MILES

Hello. The turn signals in this vehicle do not work. I have replaced the relay which got the hazards working. I replaced the multifunction switch which did not fix it. Right now, hazards, brakes, headlights are working. Just not the turn signal. How do I find the issue?

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Hi,

I'm looking through the wiring schematic and never saw one so confusing. I attached three pics below and need you to check all the fuses indicated. Specifically, check the ignition E fuse in the under-hood fuse box. That supplies power for the signals signal switch. It appears the hazard gets power from a different place.

When you check these fuses, make sure there is power to and from them.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find.

Joe

See pics below.

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Wednesday, December 4th, 2024 AT 7:56 PM

Q’S RIDE

MEMBER
2 POSTS

Hello. Thanks for the info. The turn signal fuses at position 3 and 4 are not receiving power. The fuses are good when they light up in other positions but not where they should. Also, the fuse in position 5 does not light up. Ignition fuse? Thanks for your help.

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Saturday, December 7th, 2024 AT 4:02 PM

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Hi,

You lost me on the fuse numbers. Fuses 14 and 19 are under the driver's seat. Ign E (fuse 22) is in the under-hood fuse box. Which of these doesn't have power? And what do you mean they don't have power at the right time?

I need clarification to follow the power distribution schematics and see where power is coming from.

Let me know.

Joe

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Saturday, December 7th, 2024 AT 9:15 PM