Windshield washer pump problem

[Vidal]

I posted this ealier in another section (Tech), but haven't been able to resolve it, so I thought I would post here and see if anyone else has a suggestion for diagnosing and fixing this problem.

My windshield washer pump stopped working. Because there was no activity from the pump, I thought I just needed a new pump. However, I checked the pump, lines and nozzles by hooking up the pump to a 9V battery, and everthing from there on appears to be working fine. When hooked to the battery, the washer fluid started spraying with no problems. So, it seems it must be something between the pump and the switch.

Now, I'm not an electrical wizard and I may not be checking this correctly, so let me detail what I've done to check the electrical. If I'm doing it wrong I sure would like to learn. 

In doing a continuity check, everthing appears to be working OK. Hooking up the voltmeter to the +connector (i.e., the black cable to the pump) and then to bare metal, I get close to 0 ohms only when I hit the switch. So, there's continuity there when it supposed to, and therefore no short.  Connecting the -connector (i.e., the brown cable to the pump) shows 0 ohms at all times. So that appears to be good too in that it is grounded.

Putting the key in the ignition and looking for voltage, I get nothing when connected to the -connector (brown cable), which I believe is as it should be. When I connect to the +connector (black cable) I get voltage only when I activate the switch. This too therefore appears to be working properly.

It therefore seems that all the separate components of the system appear to be working in isolation, assuming I'm checking things properly. I'm therefore perplexed as to why it's not working when it's all put together. I must be diagnosing this incorrectly, but don't know what to try next.

Anyone have other ideas?

Vidal

[Guest]

My windshield washer pump stopped working. Because there was no activity from the pump, I thought I just needed a new pump. However, I checked the pump, lines and nozzles by hooking up the pump to a 9V battery, and everthing from there on appears to be working fine. When hooked to the battery, the washer fluid started spraying with no problems. So, it seems it must be something between the pump and the switch.

sometimes I think it's called "multifunction" switch because of all the different possibilities of problems you can face when it fails