GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Does the instrument cluster speedometer operate properly?

--

Go to Step 2

Go to Head Up Display (HUD) System Check

2

Test CKT 817 for an open or short to ground.

Does an open or short to ground exist in CKT 817?

--

Go to Step 3

Go to Step 4

3

Repair the open or short to ground in CKT 817.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

4

Inspect for loose or corroded terminals at the HUD module connector.

Do any loose or corroded terminals exist?

--

Go to Step 5

Go to Step 6

5

Repair the loose or corroded terminals at the HUD module connector.

Are the repairs complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

6

Replace the HUD module.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

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