Repeat the tests just to make sure of your test results. Let's take a look at what your test results mean:ĬASE 1: One or more of the circuits tested DID NOT have continuity when the blower fan speed knob was turned. You should have continuity between H and G (see image 5 of 6 to identify the proper male spade terminals to probe). With the blower switch knob set to the HI position. The following links will help you comparison shop for the blower motor control switch: The best place to buy it, to save a few bucks, is online. You can find the blower switch just about in anywhere. You don't have to buy the whole A/C-Heater Control Panel to replace the blower control switch since the switch is removable. This is no cause for concern since the circuit descriptions are the same for all of the GM vehicles covered by this repair tutorial. NOTE: There's a good chance that the color of the wires described above DOES NOT match what's on your particular vehicle. The following circuit descriptions will help: Blower Switch Circuit Descriptions The cool thing is that diagnosing/troubleshooting the blower switch isn't hard. When this happens, one or several of the blower fan speeds stop working. Since these are mechanical connections the blower switch is making to open and close these circuits, over time and use these contacts become pitted and covered in carbon (from the electrical arching that occurs when the contacts close). This interruption and diverting of battery power goes on for all of the other blower fan speeds.In tech speak: circuit G and D is now considered ‘open’ while circuit G and C is now considered ‘closed’.This battery power is now interrupted from terminal D and diverted to terminal C of the blower switch harness connector.When you turn the blower fan switch to the LO position:.This battery power is channeled to terminal D of the blower switch harness connector.Battery power is available in terminal G of the blower switch connector. ![]() When the blower fan is in the OFF position:.To really explain this and make it make more sense, let me give you an example of what happens when you turn the blower fan speed knob from OFF to LO: What this means in plain English is that as you turn the blower fan speed knob from OFF to any of the fan speeds (LO, M1, M2, and HI), the blower switch mechanically opens and closes the two contacts necessary to divert the incoming battery power (from circuit G) to the different circuits that'll get the blower fan speed you're choosing. In a nutshell, the blower switch interrupts and diverts the electrical current from one contact to another.
0 Comments
|
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |