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My best bet is still continuity. Either on the switchboard itself or between it and the wiper motor. Measure the continuities between the connector pins and the traces on the board, as the connector soldering is the most likely culprit. I outlined how to measure the continuity between the plug and the motor itself above, can also be found in the FSM at 50-44.
If it never works, the problem should be apparent, but you can also try applying a little bit of force on the board's connector to "simulate" having the cable plugged in, that could break the continuity in the solder.
I grabbed the book again, back to step 1. I had some things i didn't understand but with a second look this might be whats going on.
The harness has 12v at SWH (marked yellow). It drops when I press the button but immediately goes bach to 12v at release. I would assume that is why it doesnt continue it's cycle.
When I connect a battery as shown in the image, I get like 0.3v or something, not 12v what I would expect according to the manual.
This one I don't understand at all.
But, what I start noticing is that when the wipers are in park position, I hear the relay click when I turn on interval. How ever, when the wipers moved just a bit, the relay and thus the wipers turn off again. This is a new discovery to me but I feel like this might be a clue to follow
The first looks like a symptom: It goes to 12V when the switch does not run the motor. As for your second, that is how the INT function works. It "nudges" the wiper a little bit, then the park function takes over and returns the now slightly not parked wiper to its proper place, of course it can only do this by making an almost full cycle. At least the INT relay works then
Check the signal coming from the motor to the switch: Measure voltage between L/Y and B (on your image B == E (ground) and L/Y is the bottom right pin, see FSM 50-44 in the wiring diagram). When the wiper is parked you should have 12V, and when its not parked 0V. This is essentially a switch in the motor that tells the wiper switch when its not parked, making the wiper switch run the motor as if wiper operation was manually selected. You can think of it as the motor turning your switch on.
Yea that's what I initially thought, that it would be in the motor it self but by eye things checked out and after reading a thing or two and seeing the complexity of the switch, I started putting my attention towards the switch.
Anyhoo, L/Y - B checks out fine. Inded 12V parked and 0V not parked.
I took apart the wiper motor completely this time. Checked the fuse to be sure and cleaned the racetrack and contact fingers.
I've been looking at the schematics for a while now but I can't seem to get my head around it completely.
For instance, I notice that L/Y gets rerouted to L/W, but only if the relay is closed in the cluster switch. When it's closed, L/W passes trough that relay, over L/Y to the motor, trough the switch to B (if that switch is switched to B that is).
When that relay is not closed, or switched I should say, L/R is connected to ground trough the cluster switch. And the relay is switched on with position II or MIST.
What I don't understand is why does the motor not turn while L/R is connected to ground trough the cluster switch. L/R is one of the 3 motor brushes. L is ign power to L/W and another brush. L/W goes to the open relay and a diode. So according to the schematics there should be a current flowing from L to L/R trough the cluster switch to ground. But the motor doesn't spin.
Not that that is a bad thing because that this moment the wiper should be off, I just don't understand why. I'm overlooking the logic on this part.
L/W and L/R measure 12V in park by the way. At the motor.
The schematic cheats a bit and the position selection appears as just a switch when in reality its backed by relays. For parking, bottom line is, you need to pass a grounded L/Y through the switch to L/W. For this you need three things:
- LO speed relay (5 legs) must make connection between legs 1 and 4 when OFF. (When ON it connects L/W to GND instead.) (Relay is Omron G5LE-14)
- HI speed relay (6 legs) must make connection between legs 6 and 5 when OFF. (When ON it connects L/R to GND instead. (Relay is Omron G6C-2114)
- Wiper motor making connection internally to ground L/Y when not parked.
+1 Any wire/solder connections on this path.
Did you actually replace the relays? If not measure the resistance between the legs and L/W + L/Y, you are likely to find your problem.
As for L/R, it should absolutely run on high speed if the HI relay is on. Is your high speed inoperable too? The cluster switch only connects it (per schematic) if its in high speed position (but what it really does is, turns the HI speed relay on).
Last edited by Barnahadnagy; 07-02-22 at 03:16 PM.
For the L/R connection:
The other relay can still be bad. The schematic for this is a high level one, meaning it does not have anything to do with the actual board layout. It completely omits both relays, and instead has a magical "INT Relay" box that in reality is a little bit of both relays, but mostly a transistor based circuit. No need to overthink it
06-24-22, 03:54 PM
