rear wiper doesn't work - Page 4 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #31  
Old 10-18-2009, 06:53 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
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Rear circuit breaker #9 brings 12V to the rear wiper motor, (for future reference) but you don't have that problem if your orange wire has 12V. Check A (black) to be a good ground. The dark green wire is a PWM signal from the LGM, so if you command high speed wiper action, that wire should read 5-10V on a meter set to the DC scale, and perhaps the same on a meter set to AC volts.

If the control wire isn't getting any PWM square waves, then perhaps the speed control switch up front isn't getting read by the BCM. Pull the switch from the dash, and check the white wire (pin A) for a 12V reference signal, and the output gray (Pin E) will have a voltage that varies according to the position of the switch. The switch is full of discrete resistors like a potentiometer with a jumpy output.



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  #32  
Old 10-18-2009, 07:26 PM
p_wheatstraw p_wheatstraw is offline
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2002 Chevy TrailBlazer LTZ
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I have 12V on the white wire. The voltage on the gray wire varies depending on the knob position as follows:

0 - 1.6V
1 - 2V
2 - 2.4V
3 - 2.8V

As an aside, I looked at the rear fuse panel again, and I don't have anything in position #9.
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  #33  
Old 10-18-2009, 09:15 PM
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the roadie the roadie is offline
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And dark green at the rear wiper motor is always around 0 volts? Check the same wire on connector C2 pin 3 at the LGM. You did the right thing to check the existence of serial communication to the LGM, so that can't be it. Sorry about the circuit breaker misdirection - I didn't check the 2002 schematic, and assumed they didn't change the design there before my 2004.



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  #34  
Old 10-18-2009, 09:29 PM
p_wheatstraw p_wheatstraw is offline
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2002 Chevy TrailBlazer LTZ
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Yeah, the green wire was always 0V. Also, if I wasn't clear earlier, the black wire does show as ground.

I'll check the pin at the LGM tomorrow, it's unfortunately too cold out right now. Maybe I can also figure out why my rear speakers suddenly went dead. . .
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  #35  
Old 10-19-2009, 05:44 PM
p_wheatstraw p_wheatstraw is offline
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2002 Chevy TrailBlazer LTZ
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Well. . .I'm rocking some pretty strange voltages here. Measuring pin 3 on the middle connector from the LGM shows ground no matter what setting I have the wiper on. I know that this pin corresponds to the green wire that goes to the wiper motor because I did a continuity test on both ends of the connector to verify I had the right wire.

Now the really strange part is that if I measure pin E on the wiper motor with the wiper motor connector plugged in, I see almost 12V (11.8 to be exact) on that pin. Even if the connector from the LGM is not plugged in, there is 12V there. Could something have happened to the board on the wiper motor internally, sending 12V into the LGM and frying that pin? Maybe the rear washer line that was loose earlier caused a short?

On the plus side, I replaced my rear speakers and they work again.
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  #36  
Old 10-20-2009, 07:33 PM
p_wheatstraw p_wheatstraw is offline
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Bump for some advice?
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  #37  
Old 12-06-2009, 08:34 PM
jarrett03 jarrett03 is offline
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2005 Chevy TrailBlazer LT
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Rear wiper and defroster

I seem to have a similar problem with my 05 TB. my rear wiper and defroster do not work. and when i open my hatch it continuously clicks like it is locking. My rear wiper fluid still works, and my key fob works most of the time. What could be the problem? I do not want to take it to the dealership. Hoping I can figure it out myself.
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  #38  
Old 12-10-2009, 10:09 AM
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swartlkk swartlkk is offline
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2004 Chevy Tahoe Z71
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Just fixed my INOP rear wiper. The culprit was a broken +12V power wire from the 15A circuit breaker in the rear fuse box to the wiper motor. It broke right in the flex joint at the top of the rear hatch.

Two 3M heat shrink butt connectors, 5" of wire, and about 10 minutes later and it was operational again!

Thanks for the suggestion Bill!
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  #39  
Old 12-10-2009, 05:02 PM
p_wheatstraw p_wheatstraw is offline
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2002 Chevy TrailBlazer LTZ
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Lucky. I ended up having to buy a new wiper motor, but only after finally breaking down and paying the dealer to use their Tech II to determine whether the LGM was bad. I did manage to find a used one for a decent price, so at least there's that.
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  #40  
Old 03-29-2010, 11:36 AM
desert_dawg desert_dawg is offline
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2002 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
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Location: Appleton, WI
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I have a 2002 TB and my rear wiper will not run, either.

- washer pump will run
- arm does not move after pump runs
- I have 12 VDC on the Orange wire measured in reference to the Black wire
- keyless entry works
- radio stays on when key turned off
- no visible frayed wires in harness across rear gate hinge area
- can hear "click" from gate area when turn dash switch from "0" to "1" and then back again

Any ideas?
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