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Intermittent module failure 15598496

obijuank5

obijuank5

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I don’t really know what happened but I was wiping the dew off and hit a bump simultaneously and the wipers stopped working.
Like at the worst position too.
45F466AC-6005-41F0-87D6-1C3F94A0B58E.jpeg
After running the diag process in the service manual I condemned the wiper motor. New motor same conditions. Gaw! I have a nos module just in case because I know they are obsolete. So that’s all sorted but since this is obsolete how did this happen and is this one repairable?
I don’t want to have this happen to my new one if I have a truck problem.
I can’t break this board down cause I honestly don’t know what I’m looking at.

13ED6598-8972-46F3-BF5B-1D6BB9908FDB.jpeg
 
It burned up two traces, and you can solder some jumper wires, but have to find the cause first. Give us a pic of the other side.
 
Iirc that should be the ground. Cuase of phantom wiper sweeps. Not sure the cuase my theory is high resistance over time, conection tarnishing, motor draw,etc
 
Fastereddie said:
It burned up two traces, and you can solder some jumper wires, but have to find the cause first. Give us a pic of the other side.
Click to expand...
I marked the spots with the red sharpie to maybe help ID what it is.
3689ECC9-2885-4DC2-BA35-0399B394A946.jpeg
 
One is just a conductor, the other is out of a diode only thingvto test would be the diode
 
Wes Harden said:
Iirc that should be the ground. Cuase of phantom wiper sweeps. Not sure the cuase my theory is high resistance over time, conection tarnishing, motor draw,etc
Click to expand...
So I pulled out the electrical service manual and that is the ground path. Damn you good.
 
memories from gmt400 diagnosis at the GM agencies I worked for. for future searchers if you module is no good and a replacement is unobatainium. remove module and plug the connectors together, it will give high and low wiper speeds, but no delay.
 
Wes Harden said:
memories from gmt400 diagnosis at the GM agencies I worked for. for future searchers if you module is no good and a replacement is unobatainium. remove module and plug the connectors together, it will give high and low wiper speeds, but no delay.
Click to expand...
That is what I did
 
Wes Harden said:
memories from gmt400 diagnosis at the GM agencies I worked for. for future searchers if you module is no good and a replacement is unobatainium. remove module and plug the connectors together, it will give high and low wiper speeds, but no delay.
Click to expand...

What did the later trucks use? Are there any later sources for a similar module? Any possibility of an improved replacement with minimal work?

I hate the wipers on the truck in general, the delay is yet another source of some irritation...90% of the delay adjustment with the stalk makes almost no difference, but that last ten percent is from one swipe an hour to the equivalent of the fast setting. Almost a game of how good your fine motor skills are to get it set to the right spot. Then the rainfall changes.
 
later trucks the module was in the wiper motor. I don't know if anyone has ever tried to update a square with a gmt400 wiper motor.
 
Wes Harden said:
later trucks the module was in the wiper motor. I don't know if anyone has ever tried to update a square with a gmt400 wiper motor.
Click to expand...

@shady and I had been PM'ing in the past about getting better motors in these.

GMT400 has the cowl mounting cast as part of the motor, so adapting those I felt wasn't a good option. The 2018 Corvette wiper motor (22756324 / 22873153) is apparently what detroit speed is using in their 1983-down(?) wiper conversions. Looking at the 2018 wiring diagram (https://ck5.com/forums/media/ww-c7-jpg.41939/full), if I'm reading that right the BCM controls the delay function of that motor, which doesn't really help with a delay module replacement.

Looking at the GMT400 wiper parts on Rockauto, they sell what they call the "pulseboard", as a replacement item, and appears to just be the delay module that was incorporated into that wiper motor. Even those aren't "cheap" at ~$20-30, when the entire motor is $65.

Looking at the GMT400 motor, perhaps they could be retrofit, but would need at minimum a bracket made to fit the square body cowl. One would probably need the two designs side by side to know for certain if it would be possible without a ton of work.
 
dyeager535 said:
@shady and I had been PM'ing in the past about getting better motors in these.

GMT400 has the cowl mounting cast as part of the motor, so adapting those I felt wasn't a good option. The 2018 Corvette wiper motor (22756324 / 22873153) is apparently what detroit speed is using in their 1983-down(?) wiper conversions. Looking at the 2018 wiring diagram (https://ck5.com/forums/media/ww-c7-jpg.41939/full), if I'm reading that right the BCM controls the delay function of that motor, which doesn't really help with a delay module replacement.

Looking at the GMT400 wiper parts on Rockauto, they sell what they call the "pulseboard", as a replacement item, and appears to just be the delay module that was incorporated into that wiper motor. Even those aren't "cheap" at ~$20-30, when the entire motor is $65.

Looking at the GMT400 motor, perhaps they could be retrofit, but would need at minimum a bracket made to fit the square body cowl. One would probably need the two designs side by side to know for certain if it would be possible without a ton of work.
Click to expand...
If I ever get the time I will look at that, I do have both
 
It looks like the high current is just passing through this board. It wouldn't hurt to repair the traces (i.e. jumper wires) and try it out.
 
Every gmt400 I've had, also had chitty wipers.
But it wasn't the power they had, it's that pulse board. I've replaced 2 in my current burb, and the others I never bothered.
Turn the wipers on any delay spot, and they just kind of do what they want.
Turn them off, and they'll run till they feel like stopping and then stop wherever they want lol.
Low anh high work perfectly though.

Which is why I never tried to figure out a way to mount one :dunno:

I looked into the Corvette one but the pics looked like it didn't work of something, and I just never pulled the trigger to try it.

Now I only drive my square about 3 times a year so almost never turn the wipers on to think about it lol.
 
Blue85 said:
It looks like the high current is just passing through this board. It wouldn't hurt to repair the traces (i.e. jumper wires) and try it out.
Click to expand...

So are we dealing with increasing resistance over time with bad contacts in the circuit overheating those traces? Or another "adequate" electrical solution by GM that has a finite life that is going to eventually be reached by all of the boards no matter what?

Easy fix if all one needs to do is utilize an adequate jumper, and/or make sure the all the circuit contacts are in good shape.
 
dyeager535 said:
So are we dealing with increasing resistance over time with bad contacts in the circuit overheating those traces? Or another "adequate" electrical solution by GM that has a finite life that is going to eventually be reached by all of the boards no matter what?

Easy fix if all one needs to do is utilize an adequate jumper, and/or make sure the all the circuit contacts are in good shape.
Click to expand...
I can't say for sure. I would expect the contact to fail first, but all I have to go by is these pictures. I would expect even 1oz copper to keep up, but with a vehicle that's decades old, we can't really know for sure the environment/stress that has occurred. If the module has a known high failure rate, there could be some inherent manufacturing issues with the printed wiring board. With the burned parts in the middle of the traces, the contacts and other components aren't to blame, just the copper. Does the housing this CCA goes in have anything contacting near these areas? Could they have seen local water/dirt intrusion?

(If the housing is close, soldering jumper wires over the failures could prevent re-assembly.
 
I forgot these have that big finned heat sink over them, wonder how hot they actually get. It's a massive heat sink for the amount of components they are trying to cool.

If it's just a copper failure, and it will fit, decent sized jumper wire from existing solder joint to solder joint and cross your fingers?
 
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