Schematic Reference: Head Up Display Schematics

Did you perform the HUD Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Head Up Display

1. Turn the ignition ON, with the engine OFF.
2. Adjust the head up display (HUD) UP, then DOWN.

Does the HUD display adjust properly?

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

Go to Step 3

Adjust the HUD image to full brightness.

Does the image dim?

Go to Step 4

Go to Step 7

1. Turn the ignition OFF.
2. Disconnect the HUD module.
3. Connect a test lamp between the UP signal circuit and battery positive voltage. Refer to Circuit Testing in Wiring Systems.
4. Then connect a test lamp between the DOWN signal circuit and battery positive voltage.

Does the test lamp illuminate in either instance?

Go to Step 5

Go to Step 6

Disconnect the HUD dimmer switch.

Is the test lamp still illuminated?

Go to Step 11

Go to Step 9

1. Connect a test lamp between the UP signal circuit and battery positive voltage. Refer to Circuit Testing in Wiring Systems.
2. Move the HUD up/down switch to the UP position.
3. Connect a test lamp between the DOWN signal circuit and battery positive voltage.
4. Move the HUD up/down switch to the DOWN position.

Does the test lamp illuminate in both cases?

Go to Step 10

Go to Step 8

Test the HUD dimming switch ground circuit for an open. Refer to Circuit Testing in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 9

1. Disconnect the HUD dimmer switch.
2. Test the HUD UP and DOWN signal circuits for an open, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 9

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

Did you find and correct the condition?

Go to Step 14

Go to Step 13

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

Did you find and correct the condition?

Go to Step 14

Go to Step 12

Repair a short to ground in the HUD UP and DOWN signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

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

Did you complete the replacement?

Go to Step 14

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

Did you complete the replacement?

Go to Step 14

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2