GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Universal Garage Door Opener (UGDO) System Check?

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Go to Step 2

Go to Garage Door Opener System Check

2

  1. Disconnect the connector at the UGDO module.
  2. Connect a test lamp between the UGDO module connector cavity A and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 40 (ORN) between UGDO module connector cavity A and fuse block.

Is the repair complete?

--

Go to Garage Door Opener System Check

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4

Connect a self-powered test lamp between UGDO module connector C C and cavity A.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Replace the UGDO module.

Is the repair complete?

--

Go to Garage Door Opener System Check

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6

Repair the open in CKT 1850 (PPL/YEL) or CKT 1850 (BLK) between UGDO module connector cavity C and ground.

Is the repair complete?

--

Go to Garage Door Opener System Check

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