The following table does not show the break light logic, just the turn signal logic:. So how does the turn signal work? So the question is how do you make a two filament bulb do three things, stop light, park light, turn signal. Robert Kabchef says they make the stop light do double duty?
Lets look at the rear light logic on a case by case basis. Case1 : Day driving, not turning and you hit the breaks? From the wiring diagram above, the stoplight switch gets it's power from the auxiliary circuit breaker. This is patched into the Blue wire on the direction signal switch. The copper triangular pads are in the neutral position so the Green and Yellow wires now have voltage.
These wires go to the two rear bulbs, giving us break lights. Case2: Day driving and turning left? When you turn left, the copper triangular pad in the signal switch breaks the Blue-Yellow connection, taking the stop light function away for the left rear bulb. At the same time it creates a connection between Yellow-Red-Brown. This causes the left turn lights to pulse using the brake light filament. Case3 : Night driving, not turning?
What the wiring diagram doesn't show is that the headlight switch also sends current to the front grille bar lights, they also have two filaments. These filaments do only a single function.
Case4 : Night driving and turning left? Case5 : Night driving and turning left at a stoplight? Like Case 4 above plus the stop light switch is sending current through the Blue-Green connection. Why do the dash turn indicators have two wires feeding them? To further complicate the matter, the right directional signal light and the left pilot light pair up also. Then both of these runs share a common terminal on the flasher module. What gives??? The diagram show the flasher unit gets it's current from the ignition switch, but how does it get the ground to make the flasher operate???
LGeoCole: The dash lamps get power from the flasher. That's the high side. The low side is the front turn signal lamp that's not being used. If it weren't hooked up this way, you could only have a single dash lamp unless the switch were more complicated. Sound OK? The idea from "Hopman Jeffery" idea makes sense. Dielectric grease does not conduct electricity so it will not cause any shorts or faults in the connection.
So for this step, all you will need is a good set of eyes, a can of compressed air, electrical cleaner, and dielectric grease. Most vehicle fuse boxes are located to the left of the driver floor mat or under the hood near the air filter box.
To test a fuse take out your trusty test light and probe both the ground and power connections. If it lights up then the fuse is working as it should. If that piece is broken, you need a new fuse. Fuses are readily available and very cheap at any auto parts store.
The flasher module, or commonly referred to as the flasher relay, is how the turn signals work. Testing a flasher module requires a volt battery, ohmmeter, test light, and a decent amount of electrical knowledge. As a mechanic of close to ten years, I can say testing a flasher module is not worth the time or headache for the low cost of a new one. Check your user manual for the specific fuse location. The turn signal switch is what we want to check last. Please consult your user manual on how to disconnect your airbag for this fix before going any further.
The turn signal switch is the lever we hit up or down to make the turn signals work. Usually, this happens at your house. Maybe you have too many things plugged in and it blows a fuse. Or, your air conditioner is working on overdrive and blows a fuse. All you have to do is reset the fuse or flip the main breaker. Your fuse may blow because you have too many signals going at one time. Or, the fuse can actually melt if the energy level gets too high.
If your fuse is blown, you will need to replace it. There is a thing in your turn signal system called a flasher module. This is what sends the power from the battery to your turn signal system. If this breaks, no power is going to get to your turn signal. Remember we said earlier that your turn signal system is connected to a bunch of other systems. They may all blow at one time. These are called thermal flashers because they relay on a heater and a bi-metallic strip to operate.
Late model vehicles use an electronic flasher with no mechanical parts. The flasher measure the amount of current flowing to the turn signal bulbs. If the current draw is in the expected range, a solid state timing mechanism and a transistor turn power on and off to the turn signal bulbs. The electronic flasher generates an audible clicking sound that imitates the older mechanical units to remind the driver that the turn signals are operating.
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