Rear wiper not working?

Hi,

No problem. I need some general info. It sounds like you have already done a lot. You mentioned checking for power at the motor. Is power present? Additionally, you mentioned working with the ground. Is the ground in good condition?

I attached the wiring schematic below. Note that if any of the liftgate or rear window switches are not closed, you "in theory" lose a ground path via the door-ajar switch. So, check those and make sure they are working and adjusted.

Next, looking at the wiring schematic, tell me where power is available or where it stops. Do the same thing with the ground circuit.

Let me know as much as you can. Note: If there is power and ground to the wiper motor, it should run. If it doesn't, you may have another faulty wiper motor. Also, let me know if both fuses, I highlighted are good and have power to and from them. I feel somewhat confident the interior fuse isn't a problem since the washer works. However, the one under the hood is a different issue.

Take care,

Joe

See pics below.

Hi,

If you have 12v with it in position 1, the motor is getting power. So, either the motor is no good or there is no ground.

Also, I have seen the voltage (12v) drop to nearly nothing when under a load due to a faulty connection. If you want to check for that as a possibility, with the wiper motor on, you would need to back probe the gray wire to see if the power drops.

As far as the tests you questioned above, if you have power to the gray wire, the only thing we need to confirm is power is consistent when requested and there is a good ground.

To check for continuity to ground, turn the multimeter to ohms. With the meter in this position, if you touch the two leads together, it should show 0.

With the vehicle power off, disconnect the connector at the motor. Probe the black wire in the connector with one lead of the meter and the other lead touching a known good ground. Does the meter change to 0 or near 0?

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know.

Joe

Hi,

It looks like you attached a new ground from the motor connector and appears to be grounded to the side body panel. That is perfectly fine, and you can leave it like that. It won't hurt anything.

So, we have power and ground. That leaves the motor. Is the one you have under warranty?

Let me know.

Joe

Hi,

Will the new one work if you do that? If it doesn't, send it back. The problem is in the connector.

Check the male pins on the motor. Make sure they are tight and don't wiggle. If they are good, check the female end of the connector's pins. Are they stretched or is anything causing them to be loose? If possible, take needle nose pliers and gently and slightly bend the connector pins in a direction that will tighten them on the motor. That is where I believe the problem is.

Let me know.

Joe

Also, no need to perform the tests I suggested. We now know power and ground are available.

Hi,

Sounds good. Were you able to try what I recommended? Was anything loose or stretched?

Joe

Hi,

Make sure there isn't an issue with the black wire (ground). As far as the connector is concerned, my manuals don't provide a part number.

If I recall, this has either a 4 or 5 pin connector. Go to the site below and see if you can identify the one that you are replacing. You will need to page down, but it is based on the number of pins and design.

https://www.oreillyauto.com/search/v/a/3734/automotive-suv-2003-chevrolet-tahoe?q=rear+wiper+motor+wire+connector

Let me know if this helps.

Take care,

Joe

Hi,

Have you been able to resolve all issues? Let me know.

Joe