Caravan rear wiper not working

[Gus]

I've got an 08 Dodge grand caravan. The rear wiper and washer pump will not work. Checked fuses with meter and no problem there.

Next I took apart the lift gate to get at the wire harness back there. I'm not really sure what I should be looking for but I have to imagine I should find some voltage someplace coming to the motor. I've got 3 wires, Brown with green stripe, Brown with Blue stripe, and Black. Harness itself looks good.

I had my wife try to activate the rear wipers and fluid while I used my meter to look for voltage across any of the wires. I'm not finding anything at all. I've gone between each of the 3 wires and between each of the 3 wires and ground.

Soooo I'm leaning towards the multi-function switch as being the problem? Does that sound right to anyone? Anything I'm missing or not thinking of?

Thanks all!

[Jeremy airjer W]

Ultimately those are controlled by the tipm. If niether are working than the first thing I would do is see if the commands for those functions are being generated by the switch with a scan tool.

With both not working it seems unlikely that the switch is at fault. If it where one or the other than I would lean towards a switch.

[Gus]

I just want to clarify a little more on what you say. For clarity sake, the rear wiper control and fluid control are both on the switch in the same place. One click forward turns on the wiper, hold it forward and it pumps fluid. I'm not sure the internal workings of that switch, but I just want to confirm you still think the the switch is less likely the culprit since they both went out but knowing they are on the same part of the switch. (make sense?)

I do have access to a scan tool, but I don't really think it will be sophisticated enough tool to see what is going on with that switch. Which means a trip to the shop. I won't just throw the multifunction switch at it if you don't think it's a safe bet. I'll just have to buckle down and take it in if that is the case. Probably be cheaper than throwing parts at it.

Thank you.

Gus

[Jeremy airjer W]

all the tests on my end involve reading codes and then doing various tests involving unplugging various connectors on the TIPM and checking resistance of the circuits. More often than not the TPIM is suspect.

The switches are not really switches, they are sensors that send input signals to the TIPM and the TIPM decides what to turn on or off.

there is also a test to check for short to voltage but again you will need a scan tool to see if the input reads true or not.

[Gus]

Thank you for the additional info. I think I'll take it in.

Gus