shoon
cliTaurus
ok, so this weekend I've been tackling evil electrical gremlins with the SHO.. which brings me to my next problem; my blower motor only operates on high speed.
so I ripped out the BCM, and it was yucky... but I went over it with a fine tooth comb and couldn't find any broken circuit traces, or faulty components... assuming I tested them right. It appears good. I am 100% sure the traces are all intact, and about 70% sure that the main power regulators and resistors are good... the 30% of uncertainty lies in all those tiny surface mount components.
There is a test procedure for troubleshooting the high speed only problem (mitchell on demand).. it tells you to check the tan/orange wire and black wire for voltage while slowly rotating the speed selector wheel with max a/c selected.
mitchell says the voltage should be 1-2 volts on all fan speeds except high, which should read 0 volts. I measured from 0.15 on the lowest speed to 0.59 volts on the highest speed while checking these wires... the voltage gradually increased in small increments as I moved the thumbwheel up.
Is mitchell spec's right about the 1-2 volts? do I need a new BCM or an EATC unit?
so I ripped out the BCM, and it was yucky... but I went over it with a fine tooth comb and couldn't find any broken circuit traces, or faulty components... assuming I tested them right. It appears good. I am 100% sure the traces are all intact, and about 70% sure that the main power regulators and resistors are good... the 30% of uncertainty lies in all those tiny surface mount components.
There is a test procedure for troubleshooting the high speed only problem (mitchell on demand).. it tells you to check the tan/orange wire and black wire for voltage while slowly rotating the speed selector wheel with max a/c selected.
mitchell says the voltage should be 1-2 volts on all fan speeds except high, which should read 0 volts. I measured from 0.15 on the lowest speed to 0.59 volts on the highest speed while checking these wires... the voltage gradually increased in small increments as I moved the thumbwheel up.
Is mitchell spec's right about the 1-2 volts? do I need a new BCM or an EATC unit?
