For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the HUD System Check? | -- | Go to Step 2 | Go to Head Up Display (HUD) System Check
2 |

1. Turn the HUD control switch to the ON position.
2. Turn the ignition switch to the ON position.
3. Measure the voltage by backprobing the HUD control switch connector terminal 7 to ground while moving the HUD control switch from minimum to maximum intensity.
4. Turn the ignition to the RUN position.

Is the voltage variable within the specified value?

Zero to Battery Voltage

Go to Step 4

Go to Step 3

3 | Does the HUD control switch only display the specified value all of the time? | Battery Voltage | Go to Step 5 | Go to Step 6
4 |

1. Turn the ignition switch to the OFF position.
2. Disconnect the HUD control module connector.
3. Turn the ignition switch to the RUN position.
4. Measure the voltage from the HUD control module connector terminal 3 to ground while moving the HUD control switch from minimum to maximum.

Is the voltage variable within the specified value?

Zero to Battery Voltage

Go to Step 7

Go to Step 8

5 | Inspect CKT 717 (WHT) for a short to voltage. Is the wiring OK? | -- | Go to Step 11 | Go to Step 9
6 | Inspect CKT 717 (WHT) for a short to ground. Is the wiring OK? | -- | Go to Step 11 | Go to Step 10
7 | Inspect for a poor terminal contact at the HUD control module connector terminal 3. Is the connection OK? | -- | Go to Step 13 | Go to Step 12
8 | Inspect for poor terminal contact at the HUD control switch terminal 7. Is the connection OK? | -- | Go to Step 11 | Go to Step 14
9 | Repair the short to voltage in CKT 717 (WHT). Is the repair complete? | -- | Go to Head Up Display (HUD) System Check | --
10 | Repair the short to ground on CKT 717 (WHT). Is the repair complete? | -- | Go to Head Up Display (HUD) System Check | --
11 | Replace the HUD control switch. Is the repair complete? | -- | Go to Head Up Display (HUD) System Check | --
12 | Repair the poor terminal contact at the HUD control module connector terminal 3. Is the repair complete? | -- | Go to Head Up Display (HUD) System Check | --
13 | Replace the HUD control module. Is the repair complete? | -- | Go to Head Up Display (HUD) System Check | --
14 | Repair the poor terminal contact at the HUD control switch terminal 7. Is the repair complete? | -- | Go to Head Up Display (HUD) System Check | --