1994 chevy 1500 heater controls/wipers not working right

Asked by Jun 19, 2015 at 02:12 PM about the 1994 Chevrolet C/K 1500 Silverado Extended Cab Stepside SB 4WD

Question type: Maintenance & Repair

i tried to turn my wipers on yesterday, didnt work... just a buzzing noise, then i
checked the normal culprit, known defective motor control board, soldered that better,
no change, then i noticed when i turn the wiper controls to hi with the key turned back
to the accessory position, the ehater controls come on, which werent working before
even in run that im aware of though i havent actually double checked to be honest, had
little time to play with it and i went straight for wire testing

apon testing some things, ive found that the hot in run wire to the fuse for the heater
shows 9.4v on the volt meter when i put the negative lead to it and a pure hot at all
times 12v wire on the positive, meaning its almost completely grounded when the
truck is in accessory mode, and then when i put the wipers on hi, boom, reading like
no voltage when treated like a ground, which i have to assume means it goes hot

im going to check it more thoroughly, find a good ground to test with the right way
rather than the ass backwards way i did it lol, but from what i can tell the deal is the
hot in run only goes hot when the wipers are engaged on high and the wipers never
engage so hopefully someone can tell me somewhere it could have intersected

also, i did some flashing of my ecm, and i have an aftermarket radio, and the radio
starts up fine, the ecm i flashed from an $0D BJLH 350 with the 4l60e to an $0E BJKX
454 with the 4l80e, only differences i was aware of between those two ecm
programmings though were the transmission which should be perfectly fine im quite
sure i got that wiring correct

it shifts fine and everything as far as ive tested though its hard to drive far and fast
without an exhaust... kinda risky ya kno

anyway hopefully someone here can help me, and ill do some more testing in a few
see what else i can come up with as well as far as other symptoms and more accurate
testing of the voltage

2 Answers

bad ground to motor... apparently i messed something up in the swap

heater controls still dont work right though, the power to the hot in run seems to be cut somehow, but unless someone knows whats up with it in the next few days ill probably just end up rigging it somehow, splice it into the known good wiper hot in run or something

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