GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Garage Door Opener System Check?

--

Go to Garage Door Opener System Check

Go to Step 2

2

Inspect the courtesy lamps.

Do the courtesy lamps function properly?

--

Go to Step 3

Go to Interior Lamps System Check in Lighting Systems

3

  1. Remove the universal garage door opener from the overhead console. Refer to Garage Door Opener Replacement .
  2. Test for battery voltage at connector C1 terminal 1 of universal garage door opener connector to ground. Ensure that the body control module has not timed out.

Does the voltage measure within the specified range?

10-14 V

Go to Step 4

Go to Step 5

4

Test for ground at connector C1 terminal 3 of universal garage door opener connector.

Is a ground present?

--

Go to Step 7

Go to Step 6

5

Repair the open or short to ground in CKT 1732 (ORN).

Is the repair compete?

--

Go to Garage Door Opener System Check

--

6

Test for open in CKT 1050 (BLK).

Is the repair complete?

--

Go to Garage Door Opener System Check

--

7

Replace the garage door opener . Refer to Garage Door Opener Replacement

Is the repair complete?

--

Go to Garage Door Opener System Check

--