VW Dash Switch Testing - Brake Warning Light & Fan Assembly:

Video Transcript:

Hi! Sam here with JBugs.com We're going to go over testing some of the electrical components and switches for our car, before we install them, along with our new wiring harness. Brake Warning Light In this video, we're going to test; the brake light warning switch, the fan switch, and the fresh air fan. We start with the brake warning light. The brake warning light is designed to tell us if there is an issue with our brakes which have two circuits, a front and a rear. If there were an issue, and one of the circuits didn't work, the light would come on. We can also test if the light works once the key is on, by pressing the button. Looking at the back of the light, we have a 31 terminal, a 15 terminal, and a K terminal. We ground out the 31 terminal with a jumper wire, and use a 12 volt jumper box to provide power. We power up the 15 terminal, which will be our key power, and we press the button to turn on the light. Then, we apply power to the K terminal as, if there were an issue with the brakes, the K terminal would get power from the brake light switch and turn on the light. The brake light warning switch is an odd and often times not used item, but ours works so we can install it. Fresh Air Switch Next, as we are going to use the fresh air box and fan, we'll test the fresh air switch, using a multimeter. We have it set to test continuity with an audible beep. Looking at the back of the switch, we have three terminals; power in and power out to two terminals. One of the terminals is labeled 30, so that is out power in. 33F is power out for speed 1, and 33B is power out for speed 2. We set one lead of out meter on the 30 terminal, and with the switch off, we don't have continuity at either of the two terminals. We turn the switch to speed one, and we have continuity at the 33F terminal. Then, we turn the switch to speed two and check for continuity at the next terminal, the 33B. We no longer have continuity at 33F, but we do at 33B. At the off position, again, nothing has continuity. With our switch tested, we'll check our refurbished fresh air box. We use a 12 volt jump box and hook up the brown ground wire. Then, we can hook up the black/green wire, which is speed one, and we can hear our motor working. Next, we'll hook up the black wire for speed two and hear the motor turning faster than before so we confirm that it's working. Now, we can install the fresh air box, when the time comes.