My 2005 buick rendezvous keeps blowing the fuse for the turn signals and brake lights. Fuse #42 in the inside fuse panel. this just started happening two days ago. Nothing is different with the car.

Our professional automotive electronics technician Jeff, provides the answer to a dead short.

Jeff Armer Jan 01, 2024

STOP/ TRN fuse #12 20amp, location - in the instrument panel fuse box. Is this the one? Fuse blows because you have a short circuit on the wiring that fuse protects. Do you know what that is?

Turn Signal Lamps
The STOP/TURN fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the left or right position, ground is applied to the BCM on the left or right turn signal switch signal circuit. The BCM then applies voltage to the appropriate front and rear supply voltage circuits.

Grounds for the various lamps are as follows:

• G100 supplies the right front lamps

• G101 supplies the left front lamps

• G400 supplies the right rear lamps

• G401 supplies the left rear lamps

https://www.youtube.com/watch?v=oKCLzf4va7M&t=807s

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There is a shot to ground in the ABS system ! If familiar with electrical trouble shoot , find a wiring diagram an test the B+ power circuit ! That fuse supply's power to the electronic brake control module , if no short on wire from fuse box to brake control module , the module has an internal problem .

You have a short some where in the wire from the fuse box

fuses blow from over current( dead short) they are rated at lower than what is required so that the wire doesn't burn
If you keep putting in bigger fuses without fixing the dead short, eventually the wire will melt the plastic insulation off and the vehicle will burn

Check the HZDLFL fuse# 40 - 15amp in the console fuse block
Fuse Block - Center Console
Inside of console, behind the right console access panel , if the fuse is good the turn signal / hazard flasher module is bad.
Turn Signal/Multifunction Flasher Module
In the fuse block - center console

It's under the hood. Fuse #32.

Check the fuse box on the right (passenger) side of the center console. You should be able to identify which fuse it is by checking in the owner's manual.

Pull the electrical connector to the visors out of the headliner and disconnect it from both visors, see if the short goes away.

ck. the fuse 1st then i would say its prob. the multifuntion switch