So I ran a test wire from the plug on pressure switch to ground and compressor started up. So we either have a wiring issue to the pbu or a bunch of bad pbu's?
Sent from my iPhone On Jul 14, 2013, at 8:09 AM, Peter Frederick <psf...@earthlink.net> wrote: > Jumpeingr 5 and 7 is what the relay does, so your compressor is good and the > clutch coil conducts enough to at least spin it, but that does not mean the > KLIMA is good. > > As I said, the PBCU switches on the compressor by grounding the wire from the > low pressure cutout switch, so if the KLIMA is good, grounding that wire > indicates that the PBCU is bad for some reason. If there is no voltage > present at the low pressure cutout switch, either the wiring or the KLIMA is > bad, and if there is but you don't get the compressor to come on when you > ground it, the KLIMA is bad. > > You should also check the OVP relay, as I think the PBCU is protected, and a > bad OVP relay will leave you with no or intermittent operation. > > Peter > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
