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

EHU Scan Tool Data Parameters

Parameter

System State

Expected Value

Description

Operating Conditions: Ignition ON

2D or 3D GPS Position Fix

--

Varies

The scan tool displays None, Reserved, 2D or 3D.

Amplifier Temperature

--

Varies

This displays °F (°C). This is the current estimated temperature of the amplifier.

Amplifier Temperature Protection Level

--

Off

The scan tool displays Off, Level 1-6 or Reserved. This is the current amplifier temperature protection level.

Audio Drive Temperature

--

Varies

This displays °C (°F). This is the current estimated temperature of the audio drive.

Audio Source

--

Varies

The scan tool displays AM, FM, CD/CD-MP3, CC, Phone, TA, Navigation, DAB, AUX, CDC or VRU. This is the current audio source.

Blower Fan Speed

--

Varies

This displays %. This is the current speed of the blower fan measured in percentage.

CD Changer Slot 1-6

--

Varies

The scan tool displays In Use or Not In Use. In Use is displayed if a CD is in the corresponding slot.

CD In

--

Varies

The scan tool displays Yes or No. Yes is displayed if a compact disc (CD) is in the player.

CD Mode

--

None

The scan tool displays None, Checking CD, Loading CD, TOC reading, CD is playing, Track seek, Fast Forward, Fast Rewind, Ejecting CD, Tp-Stop, Pause, Test mode or Error. This is the current CD mode.

CD Player Status

--

Varies

The scan tool displays None, Random CD, Random Folder, Track Repeat, Folder Repeat, CD Repeat or Track Scan. This is the current status of the CD player.

Dead Reckoning Velocity

--

0 km/h (0 mph)

This displays km/h (mph). This is the dead reckoning velocity.

GPS Antenna Status

--

Okay

The scan tool displays Open Circuit, Short Circuit, Off or Okay. This is the current status of the GPS antenna.

GPS Velocity

--

0 km/h (0 mph)

This displays km/h (mph). This is the current GPS velocity.

'KEY-IN' Status

--

Inactive

The scan tool displays Active or Inactive. Active is displayed when the key is in the ignition.

Mute Control Input

--

Inactive

The scan tool displays Active or Inactive. This is the current state of the mute control.

Position Latitude

--

Varies

This displays a numeric value. This is the current latitude angle position of the vehicle.

Position Longitude

--

Varies

This displays a numeric value. This is the current longitude angle position of the vehicle.

Remaining Security-Code Inputs

--

Varies

This displays a numeric value. This is the remaining number of security code inputs.

Satellites Tracked

--

Varies

This displays a numeric value. This is the number of satellites tracked.

Security Wait Time

--

Varies

The scan tool displays Running or Not Running. Running is displayed if there is a security wait time.

Theft Protection

--

ID O.K.

The scan tool displays ID O.K., Unit disabled, Delivery State, ID N.O.K. yet or ID-Comp running. This is the current state of the theft protection.

Tuner 1 Average Field Intensity

--

Varies

This displays dBuV. This is the average field intensity of tuner 1.

Tuner 1 Frequency

--

Varies

This displays a numeric value. This is the current tuner frequency.

Tuner 1 Frequency Unit

--

Varies

This displays MHz or kHz. This is the tuner frequency unit.

Tuner 1 Field Intensity

--

Varies

This displays dBuV. This is the tuner field intensity.

Twin Audio Remote Control Key Status

--

No Key Pressed

The scan tool displays No Key Pressed, Left Arrow, Left Activated, Right Arrow, Right Activated, ON/OFF-Key, TUNER-Key or CD-Key. This is the current state of the twin audio remote control keys.

Twin Audio Remote Control Status

--

Connected

The scan tool displays Connected or Not Connected. This is the current state of the twin audio remote control.

Vehicle Speed

--

0 km/h (0 mph)

This displays km/h (mph). This is the current vehicle speed.

Volume Control

--

Varies

This displays %. This is the current volume control percentage.

Volume Decrease

--

Varies

This displays dB. This is the current volume measured in decibels.

Warning Amplifier Temperature

--

Inactive

The scan tool displays Active or Inactive. This is the current state of the amplifier temperature warning.

EHU Scan Tool Output Controls

Output Control

Description

Activation Theft Protection

This output control is used to activate theft protection.

Cooling Fan Test

This output control is used to command the cooling fan.

Deactivation Theft Protection

This output control is used to deactivate theft protection.

Program Audio Index

This output control is used to program the audio index.

Program Code Index

This output control is used to program the code index.

Program Temperature Index

This output control is used to program the temperature index.

Program ECU

This output control is used to program the electronic control unit (ECU) or control module.

Program Mid Speed CAN-Bus Config.

This output control is used to program the mid speed control area network (CAN) serial data bus configuration.

Program Variant Configuration

This output control is used to program the variant configuration.

Read ECU Identification

This output control is used to read the electronic control unit (ECU) or control module identification.

Reset ECU

This output control is used to reset the electronic control unit (ECU) or control module.