Detail auto ac compressor wiring diagram - If the a/c for your automobile isn’t operating, step one is to look if the compressor runs when the turn on the a/c and the engine. In case you discover an ac compressor received’t run situation, comply with those diagnostic steps to find out what’s wrong. You’ll need a virtual multimeter and a wiring diagram or parts locator to locate the excessive and occasional strain switches. Engine off. Disconnect the electric connector at compressor grab. Set meter at dc volts. Join high-quality cause one terminal in grab electrical connector (1) , terrible cause battery ground. Start engine with a/c became to max. Search for battery voltage on meter. If voltage is 0, circulate nice cause the alternative terminal in electrical connector. If still 0, proceed to step 2. The pcm will not offer ground to the compressor relay if the gadget is low on refrigerant or the stress within the gadget is too high due to a blocked condenser, horrific orifice tube or tmx valve. Discover the low pressure and high stress switches. With meter nevertheless set on dc volts, disconnect the electrical connector at the low strain transfer. Join the fine lead to one terminal and the poor lead to the opposite terminal. Start the engine and flip the a/c to max. Search for voltage on one of the two terminals (five). If you see volts, which means the pcm is providing strength. Do the equal test at the excessive stress switch five). Of strength is gift at each switches, conduct a continuity take a look at across the transfer contacts step 4. Find the compressor grasp relay and take away it from its socket. Join the terrible meter result in battery negative terminal. Probe the relay socket terminals to stumble on battery strength at terminals 2 & 3. In case you don’t see battery voltage on each terminals, take a look at the fuses and wiring to the relay. When you have battery electricity on each terminals, connect the tremendous result in terminal three and the negative cause terminal four. You have to see battery voltage. If you don’t, the pcm isn’t imparting floor to the relay manipulate coil, flow to step three. In case you see battery voltage on one terminal, go away the lead in that terminal and move the terrible lead to the opposite terminal. If you see battery voltage with both leads connected to the electric connector, that confirms the compressor grasp is getting electricity and floor. That means the grasp coil is awful. Some clutches are replaceable, others aren’t and you must replace the complete compressor.