Schematic Reference: Head Up Display Schematics

Did you perform the Instrument Cluster Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

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

Does the HUD dim properly?

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

Go to Step 3

Is the HUD up/down switch also inoperative?

Go to Step 4

Go to Step 5

1. Turn OFF the ignition.
2. Disconnect the HUD module connector.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the dimming signal circuit at the HUD module connector and a good ground.
5. Adjust the HUD to full intensity then back to full dim.

Does the test lamp go from full intensity then dim?

Go to Step 8

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the HUD switch connector.
3. Test the HUD switch ground circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

Test the dimming signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

Inspect for poor connections at the harness connector of the HUD 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 11

Go to Step 9

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 11

Go to Step 10

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

Did you complete the replacement?

Go to Step 11

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

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2