Dandy. Now the potential problem is there can be a break in the wire with just one tiny strand left, and that is enough for a digital meter to detect 12 volts, but it's not sufficient to pass the amount of current needed to run a motor. If you tested the wire with a test light, those draw more current and we can believe it. To be safe, and to insure we are not glossing over a clue, test that wire while the switch is plugged in and you activate one of those switches. Either that 12 volts is going to stay there, or it is going to drop close to 0 volts. If it drops to 0 volts, we have to treat that red wire as not having 12 volts. This may seem like overkill, but it is exactly the type of mistake that sends experts down the wrong path.
There are actually 12 switch contacts built into the driver's seat switch assembly, and we know they did not all fail at the same time. Also, there are three motors, and they also did not fail at the same time. That only leaves the ground circuit as the source of the defect. We can use any of the three circuits for testing. I am going to pick the forward/backward switch, just so I can tell you which wires to probe. These next tests must be done with the switch plugged in.
Back-probe the tan and the light green wires. Both will have 0 volts when the switch is released. Now, while watching one of those wires, move the switch in one direction, then the other direction. In one of those directions you should find 12 volts on the tan wire, and 0 volts on the light green wire. In the other direction, you should find 12 volts on the light green wire and 0 volts on the tan wire. If you find 12 volts on both wires at the same time, regardless of which way you push the switch, the ground wire has a break. If that is what you find, measure the voltage on the black wire while the switch is pressed and you have that 12 volts on the tan and light green wires. If you find 12 volts on the black wire, there is a break in that wire or where the wire is bolted to the body, near the base of the left "B" pillar. If you find 0 volts on the black wire, either there is break inside the switch, (very uncommon), or that terminal is not making good contact.
Monday, February 27th, 2017 AT 9:55 AM