GM Service Manual Online
For 1990-2009 cars only
Table 1: Head Up Display Scan Tool Data Parameters
Table 2: Head Up Display Scan Tool Output Controls

Head Up Display Scan Tool Data Parameters

Parameter

System State

Expected Value

Description

Operating Conditions: Ignition ON

Adjust Display Down Switch

--

Inactive

The scan tool displays Active or Inactive. This is the state of the adjust display down switch.

Adjust Display Up Switch

--

Inactive

The scan tool displays Active or Inactive. This is the state of the adjust display up switch.

Battery Voltage Signal

--

Varies

This displays Volts. This is the current battery voltage signal.

Dimming Level

--

Varies

This displays %. This is the current dimming percentage level.

English/Metric Status

--

English

The scan tool displays English or Metric. English should be displayed for vehicles in the United States.

Language

--

English

The scan tool displays English, French, German, Italian, Spanish or Japanese.

Page Switch

--

Inactive

The scan tool displays Active or Inactive. This is the state of the page switch.

Head Up Display Scan Tool Output Controls

Scan Tool Output Control

Description

Display(s) Test

The scan tool commands the HUD to perform a Grid test when selected.