Schematic Reference: Night Vision Schematics

Did you review the Night Vision Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Instrument Panel, Gages and Console

1. Position the vehicle approximately 8 meters (25 feet) from the nearest object.
2. Cover the lower windshield with a mat.
3. Cover the ambient light sensor.
4. Turn ON the ignition, with the engine OFF.
5. Turn the head-up display (HUD) ON.
6. Turn the twilight sentinel OFF.
7. Turn the headlamps OFF.
8. Turn the front fog lamps OFF.

Does the night vision video image turn OFF?

Go to Step 3

Go to Step 4

1. Turn the headlamps ON.
2. Turn the HUD OFF.

Does the night vision video image turn OFF?

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

Go to Step 6

1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the HUD Dimming parameter in the instrument panel module (IPM) Non-HVAC data list.

Does the HUD Dimming parameter display ON?

Go to Step 11

Go to Step 5

Test the HUD active signal circuit of the HUD for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 10

1. Turn OFF the ignition.
2. Disconnect the HUD.
3. Turn ON the ignition, with the engine OFF.
4. Turn the HUD switch OFF.
5. Connect a test lamp between the night vision on/off switch signal circuit and a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 7

Test the night vision on/off switch signal circuit for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 9

Test the night vision on/off switch 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 16

Go to Step 12

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

Did you find and correct the condition?

Go to Step 16

Go to Step 10

Inspect for poor connections at the harness connector of the HUD. 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 16

Go to Step 14

Inspect for poor connections at the harness connector of the IPM. 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 16

Go to Step 13

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 16

Go to Step 15

Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 16

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Replace the HUD. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 16

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

Did you complete the replacement?

Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2