ERLS Fuse Keeps Blowing When Climate Control is Turned on! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 08-31-2006, 09:11 PM   #1
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Default ERLS Fuse Keeps Blowing When Climate Control is Turned on!

On my 93 Bonneville I keep having this problem with the fuse blowing. It is the ERLS fuse, and its located under the passengers side kick panel next to the vehicles ECM. The ERLS fuse controls several things. My car has the digital climate control on it, and each time I turn on the climate control it pops this fuse. I think either the climate control is faulty or possibly something to do with the A/C compressor. The A/C compressor doesn't engage, but both cooling fans do come on. The system is fully charged and I'm not sure whats wrong with the system here. I don't know if I have a faulty A/C relay or what. Has anyone here had a similar problem to this one. I've looked up and found similar problems on the internet with other GM cars and the problem has been the A/C compressor clutch diode, but I don't believe our cars use a diode for the A/C compressor.

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Old 08-31-2006, 10:19 PM   #2
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The newer Bonnes have the compressor clutch diode, not sure about older years. Anyway, it sounds like you have a direct short on that ERLS ckt. when turning on climate control. Remove the ERLS fuse, locate the load side in the fuse socket with a multimeter set on measuring DC voltage (load side would be opposite the power side in the socket). Once you establish load side of fuse socket, shift multimeter to ohmmeter, place one lead in ERLS fuse socket load side, the other lead to ground with climate control turned off. You should be reading a high resistance to ground. Turn on the climate control, if the ohmeter goes to zero, this is the direct short scenario. From there you will have to isolate things further downstream that are climate control related by disconnecting electrical connectors at the component level. There may be another GH coming in here with 93 schematics to help you out soon I hope. What are the other loads/accessories on the ERLS ckt?
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