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1994 chevy 1500 heater control/wipers wont work

Junkie2100

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Junkie2100 New Member

Junkie2100

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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

Junkie2100 New Member

Junkie2100

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new info gathered, hot when run to wipers seems to be giving 12v to the fuse, but to the fuse on the heater controls i get about 1v unless i have the wiper fuse in and the wipers set to high then it gives 9v and thats enough to engage the controls and light them up... it seems to be using the wipers as a power supply, and no neither of them work when the truck is running either

Junkie2100 New Member

Junkie2100

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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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