Problems with washer and wiper Avalanche -07

[AvalancheSWE]

This summer when I was out driving, the washer and wipers started by itself and didnt stop until I turned the car off and started it again. I bought a new multi switch from rockauto, replaced it, thinking that might solve the problem but it didn't. So I bought a new washer pump and replaced it, but that didn't help me either. This pump broke after like 1 month, and came with a 20 days warranty () so I had to buy a new one. Replaced that one but of course the washer still turned on intermittent.

 

I pulled out the fuse for the washer pump to not overheat it and ordered a new wiper motor, I read the pulse board might be broken. So I replaced the wiper motor today, put back the washer fuse but now it wont work. The wipers work just fine (kinda, they are on all the time even though they should just go off when the rain sensor is wet) but they wont work when you press the multiswitch to wash the window.

 

Its odd to me the first pump I replaced broke and now this ones not working. When I drove without the washer fuse, the wipers would still wipe intermittent.

 

Whats the next step here? This is really frustrating, specially  in the winter when u need the washer more than ever.

 

Sorry for poor English.

[richard wysong]

sounds like you got a bad wiper motor or possibly theres a different 1 for rain sensing. the pulse board is replacable without changing the motor. your English is better than a lot of posts

[AvalancheSWE]

I replaced the wiper motor 1 hour ago. I was just gonna replace the pulse board, but it was soldered to some cables in the motor.

[richard wysong]

possibly defective, try another 1

[AvalancheSWE]

Nah, it came brand new out of the box. Its the washer thats the problem.

Is there a relay or something that might be broke?

I've replaced 3 components: Multi switch, washer pump and wiper motor. Is there anything I've missed?

[AvalancheSWE]

Could it possibly be a faulty Bcm? I have several malfunction switches like seat heater, running boards, flickering dome light etc. This could be related in some way, right?

[richard wysong]

washer pump is controlled thru the circuit board in the wiper motor,  sounds like you have multiple issues. does the washer pump have a good ground? it worked before you replaced the motor and now it doesn't .you have a defective wiper motor probably just the board but just exchange the whole thing

[AvalancheSWE]

9 minutes ago, richard wysong said:

washer pump is controlled thru the circuit board in the wiper motor,  sounds like you have multiple issues. does the washer pump have a good ground? it worked before you replaced the motor and now it doesn't .you have a defective wiper motor probably just the board but just exchange the whole thing

Its a bit weird, it works sometimes and sometimes it dont. It worked 1hr ago but the washer wouldnt turn off until I shut the car off and then it wouldnt come on again. Its like its shutting itself off to prevent further damage or something.

It is the exact problem I had before I replaced the wiper motor earlier today.

Edited February 5, 2022 by AvalancheSWE

[richard wysong]

time to get a wiring diagram and put the parts cannon away. check the grounds etc.. the multi switch should send a signal to the motor triggering an electronic relay for the pump and starting the motor. with the rain sensor this may be different tho so you will need to consult a service manual with a wiring diagram. maybe someone else here knows if its different

[AvalancheSWE]

This might sound odd but there was this guy on another forum with the exact same problem as me. He solved it by replacing the fuse to the BCM. So I figured I give it a try and replaced the fuse. Voila, problem solved. It has been working for two days straight at least. Idk if the fuse was the problem, or maybe it just needed to be reset when the power was cut or something, but it's working for now at least.

[AvalancheSWE]

After 5 days of trouble free driving, the problem returned. Usually I could reset the washer/wiper by turning the car off and then on again, but when I did it this time it just picked up the washing cycle from where it ended. Idk what to do anymore.