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-   -   80 series rear wiper issue (http://www.risingsun4x4club.org/forum2/showthread.php?t=20425)

subzali 10-27-2013 10:00 PM

80 series rear wiper issue
 
1 Attachment(s)
Calling electrical gurus.

Rear wiper operates on intermittent even when switch is turned off.

I checked the switch and didn't have continuity between pins 1,2,10, and 16 when switch was off.

So is it the relay or the wiper motor? Or should I check the switch again?

See attached pdf...

The relay side of the L-R wire is getting 12V when the wiper motor is disconnected. I think it's supposed to be 0? So if that's true that points to the relay.

Pins 1 and 4 of the wiper motor have continuity, about 20 ohms resistance. I think they are not supposed to have continuity at rest, so if that's true that points to the wiper motor.

Or maybe I'm reading something wrong? :confused:

Snowrun 10-28-2013 09:32 AM

:thumb::wrench:I have the same issue and it drives me nuts. It would be nice to figure out what is causing it.

60wag 10-28-2013 10:18 AM

Can you unplug the L-B connector between the switch and the relay and see if it still does intermittent?

subzali 10-28-2013 11:51 AM

Quote:

Originally Posted by 60wag (Post 241204)
Can you unplug the L-B connector between the switch and the relay and see if it still does intermittent?

I was trying to figure out the ground path for the current, I'll see if I can just undo the L-B. I don't think I can but I might be able to get creative with alligator clips.

If it still operates in intermittent then it's gotta be the relay or the motor, if it stops then I need to look at the switch again.

subzali 10-28-2013 02:06 PM

Just to keep the documentation in this thread, the L-B wire comes back up the harness through a connector (BR1) in the storage panel.

That connector also has:
-R-Y - Rear door courtesy light
-L-Y
-L-G - from rear wiper relay to switch for wiper ON function.
-W-B - ground for rear wiper motor and possibly other stuff (defogger, high stop light, door courtesy), so that needs to be connected.
-G-W - rear stop light
-Y
-B - rear window defogger

Have to identify what those go to and if having them unplugged will affect anything.

Might also see if BT1 would be a better place to unplug.
Wires in BT1:
-L-power to the wiper motor
-L-B-from rear wiper relay to switch
-L-G-from rear wiper relay to switch
-B/L-G-rear window defogger
-L-R-rear door lock
-L-W-rear door lock

Inukshuk 10-28-2013 04:42 PM

Mine does not work at all and I will tackle it before winter sets in. I'll be following this thread

subzali 10-28-2013 10:02 PM

80 series rear wiper issue
 
Quote:

Originally Posted by 60wag (Post 241204)
Can you unplug the L-B connector between the switch and the relay and see if it still does intermittent?

Quote:

Originally Posted by subzali (Post 241209)
I was trying to figure out the ground path for the current, I'll see if I can just undo the L-B. I don't think I can but I might be able to get creative with alligator clips.

If it still operates in intermittent then it's gotta be the relay or the motor, if it stops then I need to look at the switch again.

Okay, I disconnected BT1 and ran a jumper for the L wire. The wiper stopped working with the switch OFF (yay, I think I found the problem?). I switched it to ON and jumpered the L-G wires and it worked as designed.

Earlier I pulled the relay and tested it per BE-25 in the FSM. I think it tested out ok. The only thing I'm not sure of is this phrase in Step 3: "...check that the meter needle rises from 0 V to battery positive voltage within 6 to 10 seconds. If operation is not as specified, replace the relay."

The voltage rises to battery voltage almost immediately, not between 6 to 10 seconds. Think it's ok?

Going to check the switch again.

On a good note I busted out the epoxy and I think I fixed the shaky driver side mirror. So at least I'm making forward progress.

subzali 10-29-2013 03:06 PM

I pulled apart the dash and checked the switch plug again. It appears fine. I need to get a better continuity tester though; my digital multimeter (set on ohms) kinda bounces around but then always lands on infinite resistance.

In fact, same thing happened last night when I was checking around the BR1 connector in the rear quarter panel. Unplugged, the L-B resistance to ground would bounce around and then land on infinite. It was doing some other weird things that I should confirm and document (got a test light today to do that), but I'm worried that the problem is in the wiring somewhere. I hope not. It's all in good shape, the fasteners, wiring, connectors, etc. no corrosion just a little dusty so I'm amazed there's a problem.

subzali 10-29-2013 07:51 PM

Well I got a test light and the L-B isn't grounded with the switch off. So now I'm not sure what to do, feels like I have to start over.

subzali 10-29-2013 10:31 PM

BR1 contains:
-L-B - from rear wiper relay to switch
-R-Y - Rear door courtesy light
-L-Y - stops at connector
-G - from rear wiper relay to switch for wiper ON function
-W-B - ground for rear wiper motor and possibly other stuff (defogger, high stop light, door courtesy)
-G-W - rear stop light
-Y - nothing?
-B - rear window defogger

BR1 forward to the switch:
-L-B - NO path to ground
-R-Y - NO path to ground
-L-Y - NO path to ground
-G - NO path to ground.
-W-B - path to ground
-G-W - path to ground
-Y - path to ground
-B - path to ground

BR1 back to hatch:
-L-B - NO path to ground
-R-Y - NO path to ground
-G - NO path to ground
-W-B - NO path to ground
-G-W - NO path to ground
-Y - NO path to ground
-B - NO path to ground

BR2 contains:
-L-W - rear door lock
-L-Y - rear defogger
-L - power to rear wiper relay and motor
-L-R - rear door lock

BR2 forward to switch:
-L-W - path to ground
-L-Y - NO path to ground
-L - path to ground
-L-R - path to ground

BR2 back to hatch:
-L-W - NO path to ground
-L-Y - NO path to ground
-L - NO path to ground
-L-R - NO path to ground

BT1 contains:
-L-R - rear door lock
-B/L-G - rear window defogger
-L-G - from rear wiper relay to switch
-L-B - from rear wiper relay to switch
-L - power to the wiper motor
-L-W - rear door lock

BT1 back:
-L-R - NO path to ground
-B - path to ground
-L-G - NO path to ground
-L-B - NO path to ground
-L - NO path to ground
-L-W - NO path to ground

BT1 forward (BR1, BR2 unplugged):
-L-R - NO path to ground
-B/L-G - NO path to ground
-L-G - NO path to ground
-L-B - NO path to ground
-L - NO path to ground
-L-W - NO path to ground

BT1 forward (BR1 plugged in, BR2 unplugged):
-L-R - NO path to ground
-B/L-G - NO path to ground
-L-G - NO path to ground
-L-B - NO path to ground
-L - NO path to ground
-L-W - NO path to ground

BT1 forward (BR1 unplugged, BR2 plugged in):
-L-R - path to ground
-B/L-G - NO path to ground
-L-G - NO path to ground
-L-B - NO path to ground
-L - path to ground
-L-W - path to ground

BT1 forward (with BR1, BR2 plugged in):
-L-R - path to ground
-B - path to ground
-L-G - NO path to ground
-L-B - NO path to ground
-L - path to ground
-L-W - path to ground

Relay terminal back to switch (BR1, BR2 unplugged):
-L-B - NO path to ground
-L-W - NO path to ground
-L-R - NO path to ground
-L-G - NO path to ground
-L - NO path to ground

Relay terminal back to switch (BR2 unplugged, BR1 plugged in):
-L-B - NO path to ground
-L-W - NO path to ground
-L-R - NO path to ground
-L-G - NO path to ground
-L - NO path to ground

Relay terminal back to switch (BR1, BR2 plugged in):
-L-B - path to ground
-L-W - NO path to ground
-L-R - NO path to ground
-L-G - NO path to ground
-L - path to ground


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