GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 LeSabre 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Head Up Display (HUD) Inoperative

Step

Action

Value(s)

Yes

No

Schematic Reference: Head Up Display Schematics

1

Did you perform the Head Up Display Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Head Up Display

2
  1. Turn ON the ignition, with the engine OFF.
  2. Adjust the head up display (HUD) dimmer switch to full intensity.

Is the HUD display visible?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3
  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
  3. With the scan tool, perform the Display(s) Test in Head Up Display.

Do all of the segments on the HUD illuminate?

--

Go to Step 4

Go to Step 11

4

Test the ignition 3 voltage circuit for an open, a high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Disconnect the HUD dimmer switch.
  3. Connect a test lamp between the ignition 3 voltage circuit of the HUD dimmer switch and the dimmer switch signal circuit.
  4. Turn the ignition ON, with the engine OFF.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 7

6

Test the dimmer switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 9

7

Test the dimmer switch signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 8

8

Inspect for poor connections at the harness connector of the HUD module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 11

9

Inspect for poor connections at the harness connector of the HUD dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 10

10

Replace the HUD dimmer switch. Refer to Head Up Display Switch Replacement .

Did you complete the replacement?

--

Go to Step 12

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11

Replace the HUD module. Refer to Head Up Display Module Replacement .

Did you complete the replacement?

--

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2