GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The LF power window is inoperative. All other power windows operate correctly from LF window switch and selected door switch.

1

Was the Power Door System Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

  1. Connect the scan tool.
  2. Select DATA from LH front door module (DDM) DATA List (Inputs).
  3. Operate the LF window switch in the Up and Down directions.

Does the scan tool indicate that the switch is operating correctly?

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Go to Step 4

Go to Step 3

3

Replace the LH front power window switch. Refer to Front Door Switch Replacement .

Is the replacement complete?

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Go to Diagnostic System Check - Power Door Systems

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4

  1. Disconnect the LF power window motor at the motor.
  2. Using a DMM, measure the voltage between window motor terminals A and B while pressing the LF window switch in the up and down directions.

Is the voltage within the specified range for both measurements?

10-15 V

Go to Step 5

Go to Step 6

5

Replace the LF power window motor. Refer to Power Window Motor Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

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6

  1. Disconnect the LF door module connector C5.
  2. Using a DMM, measure the resistance between window motor harness connector terminal A and door module harness connector C5 terminal B.

Is the resistance within the specified range?

0-5 ohms

Go to Step 8

Go to Step 7

7

Repair the open in CKT 165.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

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8

Using a DMM, measure the resistance between window motor harness connector terminal   B and door module harness connector  C5 terminal   C.

Is the resistance within the specified range?

0-5 ohms

Go to step 10

Go to step 9

9

Repair the open in CKT 164.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

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10

Replace the LH front door module. Refer to Door Control Module Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

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