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The mkiv Supra Owners Club

Wiring woes


Tomyspeedy

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Just put my UK spec into a new shell.

The car runs and drives fine.

 

Few niggling issues at the moment and I'm struggling to work out the source.

 

I plug the battery in and the lh front and side indicators illuminate, with ignition on they remain on and the rh side and front indicators illuminate.

Rear indicators function normally.

 

With ignition on the wiper motors operate continuously and the stalk just speeds up the operation.

 

No parking or fog lights at the front, fuses and continuity at switch good.

 

The car has a vision alarm system which appears to function normally.

 

Currently there is no drivers door wired in, could this acount for any of the issues?

 

Absolutly any help will be greatly appreciated.

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When I mean test the circuit,

 

Remove all fuses.

Remove all bulbs.

Check bulb holders for corrosion.

All ok.

 

Insert the bulbs back in. Eg rear left lights.

Insert fuse for that test rear left lights.

Then do the same for the right rear..

Front left... Then front right.

 

The insert all bulbs and test the entire lot.

 

Pull fuse for rear lights.

 

Check wiper motor and insert fuse.

 

Do the same for the head lights / internal

 

Some of these circuits will be running of a one fuse.

 

Or some of these circuits will be running a fuse to a relay. Eg wiper / demister / headlight.

When you switch these devices on you should hear a click.

 

The above method should / can narrow it down.

 

I assume you have checked around the steering wheel column to rule out cut wires for alarms / bad soldering and aftermarket steering wheels ?

 

 

 

 

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Okay, I've been working through it all.

Removed and checked all bulbs and connections checking for bent pins or corrosion.

Looks fine.

Starting replacing fuses starting with the engine bay.

Got to fog lights and they don't operate.

Switch inside tests fine, relay tests fine, fuse is good.

 

Decided to accept this and move onto the hazards.

The rear hazards function normally but the front (wings and bumper) don't operate at all.

 

I have a vision alarm installed, looked up the installation guide for it and found that the drivers door lock and unlock wires on the alarm must not be disconnected.

I can't confirm if the fogs or front hazards operated before the shell swap.

 

 

Is it possible that this vision alarm is causing me these problems?

 

My lack of experience and knowledge is infuriating but I'd love to learn how to solve this.

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Newest update. After nearly two days of work I've solved the problem.

 

The drivers side (rhd) fuse pannel, there's quite a few electrical connections that plug in. I didn't have the internal courtesy light fitted (blue plug). I had mistakenly plugged a white plug into the blue plug location. Hence indicators being linked to the dome fuse.

 

Had the blue plug been there it wouldn't have happened becuase it only fits in one slot! Toyota did make it fool proof... Im just a really good fool.

 

Thanks for all the help, learnt Alot about the circuits and found that all my grounds have next to no resistance.

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