GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 TrailBlazer - 4WD 🢒 Body Systems 🢒 Fixed and Moveable Windows 🢒 Power Window Inoperative - Driver Door

Diagnostic Aids

Power window motors have a built-in circuit breaker which protects the motor. The circuit breaker may open when there is a window obstruction, binding condition or the power window switch has been activated for an extended period of time. The circuit breaker will reset automatically as the circuit breaker cools, however 5-15 seconds may elapse before the circuit breaker resets.

Step

Action

Yes

No

Schematic Reference: Moveable Window Schematics

Connector End View Reference: Window Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Operate the driver power window in the UP and DOWN directions.

Does the driver power window operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3
  1. Install a scan tool.
  2. Monitor the Driver Window Status Data parameter in the driver door inputs list.

Does the Driver Window Status Data parameter display an active state?

Go to Step 11

Go to Step 4

4
  1. Monitor the Driver Window Status Data parameter in the driver door module (DDM) inputs list.
  2. Activate the driver power window switch in the up and down positions.

Does the Driver Window Status Data parameter change accordingly?

Go to Step 5

Go to Step 11

5
  1. Connect a test lamp to a good ground.
  2. Backprobe the battery positive voltage circuit at connector C1 cavity D.

Does the test lamp illuminate?

Go to Step 6

Go to Step 13

6
  1. Disconnect the driver power window motor.
  2. Connect a test lamp to a good ground.
  3. Probe the power window motor up control circuit at the power window motor harness connector.
  4. Activate the power window switch to the UP position.

Does the test illuminate?

Go to Step 7

Go to Step 9

7
  1. With the test lamp still connected to a good ground, probe the power window motor down control circuit.
  2. Activate the power window switch to the DOWN position.

Does the test lamp illuminate?

Go to Step 8

Go to Step 10

8
  1. Connect a test lamp between the power window motor up and down control circuits.
  2. Activate the power window switch to the UP and DOWN positions.

Does the test lamp illuminate in both positions?

Go to Step 12

Go to Step 11

9

Test for an open or short to ground in the power window motor up control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 11

10

Test for an open or short to ground in the power window motor down control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 11

11

Inspect for poor connections at the DDM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 14

12

Inspect for poor connections at the driver power window motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 15

13

Repair the open or short to ground in the battery positive voltage circuit. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 16

--

14

Replace the DDM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the repair?

Go to Step 16

--

15

Replace the driver power window motor. Refer to Front Side Door Window Regulator Replacement .

Did you complete the repair?

Go to Step 16

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16

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3