GM Service Manual Online
For 1990-2009 cars only
Table 1: ECC Scan Tool Output Controls
Table 2: PCM Scan Tool Output Controls

ECC Scan Tool Output Controls

Scan Tool Output Control

Additional Menu Selection(s)

Description

Rear defogger

Miscellaneous

The scan tool displays Commanded State: None, Off or On. The selection activates or deactivates the rear defrost.

A/C Request

Miscellaneous

The scan tool displays Commanded State: None, Off or On. The selection activates or deactivates the A/C request signal.

Recirculation Mode

Miscellaneous

The scan tool displays Commanded State: None, Off or On. The selection activates or deactivates the recirc light and drives the recirculation door to the recirculation position.

Outside Air Mode

Miscellaneous

The scan tool displays Commanded State: None, Off or On. The selection activates or deactivates the recirc light and drives the recirculation door to the outside air position.

Air Inlet Door

Motor/Actuator tests

The scan tool displays Outside or Recirc selections. The selection drives the actuator to its min or max stops.

Blower Motor

Motor/Actuator tests

The scan tool displays Commanded State: None, Off or On. This function allows you to command the blower motor to its maximum (100%) or minimum (0%) speeds.

Blower Motor Auxiliary

Motor/Actuator tests

The scan tool displays Commanded State: None, Off or On. This function allows you to command the auxiliary blower motor to its maximum (100%) or minimum (0%) speeds.

Mode Door Position

Motor/Actuator tests

The scan tool displays Defrost or Panel selections. The selection drives the actuator to its min or max stops.

Auxiliary Mode Door

Motor/Actuator tests

The scan tool displays Upper Outlets or Floor selections. The selection drives the actuator to its min or max stops.

Instant OAT Update

Miscellaneous

The scan tool displays Commanded State: None, Off or On. Updates the ECC outside air temperature input to the current raw value.

Mix Motor

Motor/Actuator tests

The scan tool displays Commanded State: None, Off or On. The selection drives the temperature actuator to its min or max stops.

Auxiliary Mix door

Motor/Actuator tests

The scan tool displays Commanded State: None, Off or On. The selection drives the auxiliary temperature actuator to its min or max stops.

Set up new HVAC

Set up new HVAC

This function allows the control module to learn what auxiliary system the vehicle is equipt with.

PCM Scan Tool Output Controls

Scan Tool Output Control

Additional Menu Selection(s)

Description

A/C Relay

--

The scan tool displays On or Off selections. This command allows you to turn the A/C relay ON or OFF.