left side windows won't operate

[Johnb21]

Hi folks..looking for a bit of support. Approx 3 months ago, the DDM fuse blew in my 2005 Tahoe LT. Well this time round, just the left side windows won't work but everything else in the DDM works just fine (locks, pass side widows). I checked the DDM fuse and of course it was fine. I tried to jump the 25a breaker and that didn't work. Without a solution and fear of rain, I grabbed a 12v battery and hook up to the window motors, of which both worked fine and therefore I was able to roll up the windows.
Am I missing something here? Could I have a broken wire? All the connections on the DDM are tight.

Appreciate any input, as I am stumped. Thank you.

 

[lkrasner]

Not necessarily a solution, but in my truck, If I pull the window/ lock switch unit out of any door, the windows do not operate (even using the switch by the driver). Check the wiring to all of these and make sure nothing is loose.

Besides that, this could be some kind of bad ground. See if you can find a check continuity from the negative side of the motor to the negative battery terminal.

 

[Johnb21]

I found my problem....must of been one of those Friday mornings when my truck was assembled. Emergency brake shorted out the main power wire in the left door harness.

#PIT3075D: Blown MBEC 1 Or LBEC 1 Fuse - keywords circuit door electrical inoperative lamp IBEC lighting lock MBEC power seat window wire - (Aug 16, 2007)
Subject: Blown MBEC 1 or LBEC 1 Fuse

Models: 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT
2003-2006 Chevrolet Avalanche, Suburban, Tahoe
2003-2007 Chevrolet Silverado Classic
2003-2007 GMC Sierra Classic
2003-2006 GMC Yukon, Yukon Denali, Yukon XL, Yukon XL Denali

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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:There have been reports of either the MBEC 1 or LBEC 1 **** fuse blown intermittently and unable to locate a short to ground.

Recommendation/Instructions:If after normal diagnostics no shorts can be found the below items have been reported:

 1. "MBEC 1" **** Fuse 50 Amp (SI Document ID # 1242532).
If no shorts are located on circuit 642, inspect circuits 1340 after the "Rt Door" circuit breaker 25 amp and circuit 1440 after the "Seat" circuit breaker 30 Amp (SI Document ID # 1242687).

◦Inspect circuit 1340 shorted to ground near the right I/P support bracket.
◦Inspect circuit 1340 or 1440 shorted to ground on the support bracket for the I/P relay block/under the carpet.
◦Inspect circuit 1440 shorted to ground under or in either front seat.
◦Inspect circuit 1440 shorted to ground near the parking brake pedal assembly. The short may only occur if the parking brake pedal is depressed.
 2. "LBEC 1" **** Fuse 50 AMP (SI Document ID # 1242532).
◦If no shorts are located on circuit 42 inspect circuit 1240 after the "Lt Door" circuit breaker 25 amp (SI Document ID # 1242687).
◦Inspect circuit 1240 shorted to ground near the parking brake pedal assembly. The short may only occur if the parking brake pedal is depressed.
Note: Replacement of the circuit breaker is needed if a short to ground is found on circuit 3, 1240, 1340, or 1440.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.