Hi All - I need some assistance with understanding some of the circuits shown in the first two pages of the attached document (please ignore page 3 &4). Particularly, I'm having difficulty understanding how two relays operate - the Automatic Wiper Relay on page one and the Windshield Wiper Intermittent Relay on page two. Both of these relays seem to operate in a way that I'm completely unfamiliar with.
Let's focus on the Windshield Wiper Intermittent Relay on page two... I don't understand how it is triggered because the trigger doesn't appear to be energizing a coil and then going to ground like I'm used to with typical relays. In this diagram, The GRN/BLK wire as battery voltage (12v) supplied to 100% of the time on one side of the coil but that voltage is carried through right to the other side onto the GRN/RED wire which also has voltage 100% of the time. So how does it get triggered? When the relay is triggered, the voltage in the GRN/RED wire drop to zero for a second and then returns to battery voltage. Is there a coil or something inside the Rain Sensor that grounds the circuit?
I also don't understand the BLU/WHT circuit that goes between the Windshield Wiper Intermittent Relay and the Windshield Wiper Motor (and also also connects to the Rain Sensor) seen on page 1. When the relay is triggered, The WHT wire connects to the BLK wire (going to ground???) which leaves the BLU/WHT wire connected between the Wiper Motor and Rain Sensor. The WHT wire has continuous voltage and so does the BLU/WHT wire until the relay is activated. When the relay activates, the voltage in the BLU/WHT wire drops to zero and returns to battery voltage then the wipers make a full sweep.
Can someone please make heads or tales of this so I can better understand how the wiper motor is activated via the rain sensor?? If someone can simply describe how this type of relay works I would appreciate it. Thanks!!!!
Let's focus on the Windshield Wiper Intermittent Relay on page two... I don't understand how it is triggered because the trigger doesn't appear to be energizing a coil and then going to ground like I'm used to with typical relays. In this diagram, The GRN/BLK wire as battery voltage (12v) supplied to 100% of the time on one side of the coil but that voltage is carried through right to the other side onto the GRN/RED wire which also has voltage 100% of the time. So how does it get triggered? When the relay is triggered, the voltage in the GRN/RED wire drop to zero for a second and then returns to battery voltage. Is there a coil or something inside the Rain Sensor that grounds the circuit?
I also don't understand the BLU/WHT circuit that goes between the Windshield Wiper Intermittent Relay and the Windshield Wiper Motor (and also also connects to the Rain Sensor) seen on page 1. When the relay is triggered, The WHT wire connects to the BLK wire (going to ground???) which leaves the BLU/WHT wire connected between the Wiper Motor and Rain Sensor. The WHT wire has continuous voltage and so does the BLU/WHT wire until the relay is activated. When the relay activates, the voltage in the BLU/WHT wire drops to zero and returns to battery voltage then the wipers make a full sweep.
Can someone please make heads or tales of this so I can better understand how the wiper motor is activated via the rain sensor?? If someone can simply describe how this type of relay works I would appreciate it. Thanks!!!!
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