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2002 chevy trailblazer_ls
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Discussion Starter · #1 · (Edited)
My rear wiper has recently stopped working.

I took the rear panels off the hatch and looked over the wiring. All was intact. Opened the arm drive casing (black cover) and gears looks good. Looked over small PC board and no visible failed components. All connections looked solid. Still no wiper arm movement.

Key note - You can hear the relay "click" back on the motor control box when I turn on the wiper with the switch on the dash. And you hear it click again when I turn the switch off.

Has anyone seen this same issue? Does it sound like a bad motor?

Thanks
 

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2004 chevy trailblazer_lt
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1,298 Posts
If you've got a volt meter, check for power at the motor. If it's there,
then most likely it *is* a bad motor. If it's not, the relay might be sticking,
or you might have a bad wire that isn't making itself obvious. The relay
clicking seems to indicate that the fuse is good, but it couldn't hurt
to verify that, and would only take a few extra seconds.

Could still be a bad component on the control board, but you'd have
to get in to component level diagnosis at that point.

Good Luck!

Chris
 

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Discussion Starter · #3 ·
Chris,

I did check the voltage on the wires. I want to say there was three wires in the motor plug, orange, green and black. The odd thing was I measured 12VDC at the plug but it was always there. I do not remember seeing the voltage change from a wiper switch position. For example I measure 12 volts with the wiper switch off or in one of the on positions.

I never had the wiper motor just run on its own. It has just stopped working.

Anyone know the expected voltages on those 3 wires?

Marty
 

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Hi Marty -

I *think* the third wire is for the intermittent function, but I
could be way off on that. I don't have the wiring diagram here
in the office. I'll have to try to check when I get home. It's
possible that some of these circuits have 12V as a reference
voltage.

Cheers-

Chris
 

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Discussion Starter · #5 ·
As a sidenote, the washer fluid pump does work. Also once the washer pump does run, it does NOT cause the wiper arm to move.
 

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Discussion Starter · #6 ·
Problem Solved

I was able to find the issue this past weekend. When I took the motor apart there is a small pc board. On that board there was a small inductor coil that had come loose. I resoldered it to the board and tested. The motor works fine now.

I did not take any pictures while there, so if you plan on checking for something like this you will need to just give the pc card a good visual inspection.
 

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I was able to find the issue this past weekend. When I took the motor apart there is a small pc board. On that board there was a small inductor coil that had come loose. I resoldered it to the board and tested. The motor works fine now.

I did not take any pictures while there, so if you plan on checking for something like this you will need to just give the pc card a good visual inspection.
Good job. Thanks for the solution.
 
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