Just some knowledge share on the recent attempt to repair the corolla fog lights. A new project about 4-5 months ago, when I placed an order for LED lights. The plan was to replace the indicators (on the front, rear and the sides) the tail light bulbs, interior dome and map lights and rear center high mount stop lamp just behind the rear window. In an attempt to swap out the fog lights with an LED, I ended up causing a functioning fog lamps to work. Upon checking the fuse box in the engine bay, there was nothing mentioned about a fog light and this got me worried as I was suspecting the relay. The bulb checked out OK. Re-seated all fuses in the box after checking each one. To gain access to the fog-light assembly, you need to steer the wheel towards the engine (inward)so you can then access the wheel guard and remove the plastic tabs there should be 2-4 and once removed, you should then be able to remove 3-4 more plastic Right behind the bumper where there is a plastic plate in sections that guard engine from gravel and dirt. Removing only the section directly underneath should be good enough to gain access to the fog lamp. There is a metal retainer that secures the bulb against the holder. So you'll have to push it in slide it out to release the clip (similar in operation of a safety pin).
If the bulb looks good, check the holder and if that looks good, you may try to swap the bulbs between the left and right. If you are good with multimeter, you might just be able to further isolate any wiring issues to verify if the issue is between the switch and relay or past the relay in case the fuse and bulbs are good. My case was just a blown fuse but since I had to access a hidden fuse box, I decided to pen down my experience and hope it helps other Corolla owners.
Points of failure:
1. The fuse (This could be in the fuse box located on the right side of the engine, between the suspension mount and the headlight, by the engine bay or the secret fuse box hidden behind glove box, passenger seat.) Checking fuses is going to be the easiest.
2. Bulb. Look for any signs of damage to the filament in the bulb. A brown/black discoloration, burnt / filament.) If only one side is impacted, then is may likely be the bulb. If both aren't working then it could be the fuse, relay, wiring (this could be the worst) and needs a proper auto-electrician to fix, better yet, take it to Toyota if you've not got a local reliable electrician. By reliable I mean a mechanic prepared to understand and resolve rather than suggest a replacement of parts. An incident from the days I owned the Ford Ikon, the wiper stopped working and after running some basic checks I couldn't find the fault and I managed to find an guy who didn't just remove the motor to inspect but disassembled the same find the fault with just a single wire that was cut due to rodent infestation, and he proactively replaced a couple of gears as we noticed a wear on them and promptly fixed it. He even told me the parts were probably worth just 10-20 rupees and basically salvaged from another motor, however, the cost of repair was only for his efforts. Had it been the manufacturer I'm quite sure, they would've suggested the wiper motor replacement.
3. Wiring. Physical inspection and verify if there is any signs of burns or if you notice any exposed wires. If one doesn't mess with the car's wiring I bet it should last you a long time (lifetime of either you or the car) :). When the modifications need cutting/splicing of internal wiring for component upgrades or accessory installs, this changes the circuitry and you may / may not face issues right way but sooner or later, you start seeing faults against various components and they are likely to be related to wiring mods.
4. Relay. I couldn't spot an relay around the fuse box but I'm sure that's a treasure hunt for another day.
5. The fog light switch would be the component I would suspect last.
If the bulb looks good, check the holder and if that looks good, you may try to swap the bulbs between the left and right. If you are good with multimeter, you might just be able to further isolate any wiring issues to verify if the issue is between the switch and relay or past the relay in case the fuse and bulbs are good. My case was just a blown fuse but since I had to access a hidden fuse box, I decided to pen down my experience and hope it helps other Corolla owners.
Points of failure:
1. The fuse (This could be in the fuse box located on the right side of the engine, between the suspension mount and the headlight, by the engine bay or the secret fuse box hidden behind glove box, passenger seat.) Checking fuses is going to be the easiest.
2. Bulb. Look for any signs of damage to the filament in the bulb. A brown/black discoloration, burnt / filament.) If only one side is impacted, then is may likely be the bulb. If both aren't working then it could be the fuse, relay, wiring (this could be the worst) and needs a proper auto-electrician to fix, better yet, take it to Toyota if you've not got a local reliable electrician. By reliable I mean a mechanic prepared to understand and resolve rather than suggest a replacement of parts. An incident from the days I owned the Ford Ikon, the wiper stopped working and after running some basic checks I couldn't find the fault and I managed to find an guy who didn't just remove the motor to inspect but disassembled the same find the fault with just a single wire that was cut due to rodent infestation, and he proactively replaced a couple of gears as we noticed a wear on them and promptly fixed it. He even told me the parts were probably worth just 10-20 rupees and basically salvaged from another motor, however, the cost of repair was only for his efforts. Had it been the manufacturer I'm quite sure, they would've suggested the wiper motor replacement.
3. Wiring. Physical inspection and verify if there is any signs of burns or if you notice any exposed wires. If one doesn't mess with the car's wiring I bet it should last you a long time (lifetime of either you or the car) :). When the modifications need cutting/splicing of internal wiring for component upgrades or accessory installs, this changes the circuitry and you may / may not face issues right way but sooner or later, you start seeing faults against various components and they are likely to be related to wiring mods.
4. Relay. I couldn't spot an relay around the fuse box but I'm sure that's a treasure hunt for another day.
5. The fog light switch would be the component I would suspect last.
Glove box removed
There are two tabs on left and right. Push both sides of the compartment inward which should then release the glove box free.
Plastic tab released
The hidden fuse box behind the glove box
The fuse map
The culprit. Blown 15A fuse.
Fuse box in engine bay on a 2003 Corolla
Fuse box in engine bay on a 2006 Corolla
