GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition switch to RUN.
  2. Press the ENG/MET switch on the IP, thus causing the units (MPH or km/h) indicator to change.

Does the units (MPH or km/h) indicator on the instrument cluster speedometer change?

--

Go to Step 2

Go to Head Up Display (HUD) System Check

2

Press the ENG/MET switch on the IP.

Does the units (MPH or km/h) indicator change on the HUD display?

--

Go to Diagnostic System Check - Instrument Cluster

Go to Step 3

3

Test CKT 876 for an open or short to ground.

Does an open or short to ground exist in CKT 876?

--

Go to Step 4

Go to Step 5

4

Repair the open or short to ground in CKT 876.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

5

Test CKT 879 for an open or short to ground.

Does an open or short to ground exist in CKT 879?

--

Go to Step 6

Go to Step 7

6

Repair the open or short to ground in CKT 879.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

7

Test CKT 880 for an open or short to ground.

Does an open or short to ground exist in CKT 880?

--

Go to Step 8

Go to Step 9

8

Repair the open or short to ground in CKT 880.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

9

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

Do any loose or corroded terminals exist at the HUD module connector?

--

Go to Step 10

Go to Step 11

10

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

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

11

Replace the HUD module.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--