Chrysler Repair: 1989 Voyager rear window washer, grand voyager, washer motor

Question
I used the washer one day and it wouldn't stop squirting until all the fluid was used-up. I unplugged the connection under the rear reservoir to stop the motor, then disconnected the battery to see if something would reset. I tried it again and the motor wouldn't shut off. How can I fix this? Any help would be greatly appreciated.
1989 Grand Voyager with 195,000 Km

Answer
Hi Jim,
The rear washer motor has power applied to it whenever the ignition swtich is "on", and it operates whenever the return wire from the motor is grounded at the rear wash-wipe switch. So you need to differentiate between two possibilities: the wire (black/white) has a break in its insulation and has become falsely grounded or the switch has become permanently grounded at the pin where that wire is connected. Fortunately there is a disconnect at the switch so if you have an ohmmeter just disconnect it and measure between that wire side and ground and between the switch side (same pin) and ground (ground being any shiney metal structural surface nearby) and see which is grounded even though you have the switch in the off position. Do this test with the ignition off. Which ever side is grounded is where you problem is located. If it happens to be the switch side you may be able to open it and repair the problem. If it is the wire side you will need to trace the wire and find the insulation break. The wire goes thru an 11-pin connector on the left side of the body (but I'm not sure where that is located).
It should be a pretty easy repair to do yourself.
If you don't have an ohmmeter then just disconnect the plug at the washer-wiper switch and turn 'on' the ignition switch. If the motor still runs, then the problem is a ground in the black/white wire because by unplugging it you have removed the wash-wipe switch from the circuit. If it doesn't still run, then the switch is bad and needs attention or replacement.
Roland