1993 Grand Cherokee. the rear window motor went out. took the regulator out and replaced the motor. now, the motor only operates in the down direction. i jumped the motor to voltage and it does work in both directions. i back probed the switch and both sides of the motor connector and there is 12.5v at each step. then i disconnected the motor and jumped it from the switch and it works in both directions. it just quits working in the 'up' position when i plug the motor in. i've tried two switches and i get the same thing. i've been on this thing all morning and i need a break and a new perspective. any thoughts?
Country: United StatesMake: JeepModel: Grand CherokeeYear: 1993Engine: 4.0
swapped switch, jumped motor to voltage, jumped motor to switch. pulled my hair out.
sorry, left rear
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sounds like you have one "leg" missing.......
The Circuit for the Power Windows is "Reversal Rest at Ground"Meaning that the Voltage & Ground "reverse" at the switchThere are "2" wires at the Window Motorwith Switch up......one wire will have 12 Volts +.....the other wire will have Ground -with Switch down.....the wire that had 12 Volts + now has Ground - ..... the wire that had Ground - now has 12 Volts +
TESTING at the Window Motor:
Use of a VOM is needed to testThe way it works:Ignition OnSwitch held in Up positionOne wire will have 12 Volts +One wire will have Ground -
Switch held in Down positionThe wire that had 12 Volts + is now Ground -The wire that was Ground - is now 12 Volts +
If Voltage or Ground checks good at motor, replace motor.If Voltage or Ground does not check good:Check Switch Voltage & Ground.Check for broken wires at Door / Kick Panel Boot
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okay. so here's what i did.i probed the switch for B+ and Ground. both of which were good.then i used wire piercing probes on the motor side of the connector. with the switch in one direction, no voltage, with the switch in the other direction i got about 5.6V. i checked the switch and both wires switch from power to ground when you operate the switch. the condition is the same with two different switches. the drivers front switch is dead. is this one of those deals where if the gang switch is dead, then the corresponding single switch wont work right?
with the switch in one direction, no voltage, with the switch in the other direction i got about 5.6V.
??very lowvehicle starts & runs?
is this with the Window Motor unplugged?If not what is it with it unplugged?
vehicle starts and runs. i've kept a charger on the battery while i'm testing. the B+ wire going into the switch has 12.5V.with the motor unplugged, i get 11.87V in the same direction, no V in the other.
with the motor unplugged, i get 11.87V in the same direction, no V in the other
Remember.......one wire shows Voltage +, one wire shows Ground - with switch up or down.If you are getting 11.87v to one wire & Ground - to the other, then the Motor has to move"unless" it is all the down or all the way up & switch is to one of those positions orthe Motor is bad
you do not have Voltage + at the Motor or a Ground -
okay. i think i overlooked something.i'm probing the back of the switch with a dual test light. the one wire shows ground and hot when switched. the other shows hot only. there is voltage on both wires when there should be. its the same with two different switches. it cant be the wire because its carrying current and has continuity. so do i have 2 bad switches?
the switch works in both directions. with the motor unplugged, there is ~11V in either direction. ok
i checked it with a dual test light. both wires switch from ground to power. ok
with the motor in the full down position, the voltage drops.
with the motor in the full up position, there is full voltage.
you are only pointing out Voltage +There has to be Ground -on the other wire for the Motor to move, at the same time the first wire gets Voltage +
You originally stated:the motor only operates in the down directionIf the Window Motor does NOT operate in the Up direction & you have Voltage on one wire, then there is NO Ground - on the other with Switch held in the Up position.
the front gang switch is inoperative for the left rear window
I missed that..............sorry........Do thisKey OnShould have VIOLET wire & BROWN wire at the Rear Door Window MotorWith Switch held in Up position, check to see which wire has Voltage +Supply a "brief" Ground - jumper wire to the "other wire" while holding switch in Up positionWindow should move
If so, then you will need to "back probe to find the broken wire or connection of the wire that you connected the Jumper Ground to
Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years