GM Service Manual Online
For 1990-2009 cars only
Table 1: HVAC Control Module Scan Tool Output Controls
Table 2: IPC Scan Tool Output Controls
Table 3: ECM Scan Tool Output Controls

HVAC Control Module Scan Tool Output Controls

Scan Tool Output Control

Additional Menu Selections

Description

Afterblow Option

Output Control

When after blow is activated the scan tool displays an *.

Blower Motor Speed

Output Control

The scan tool displays Off or On selections. This function allows you to command the blower motor to its maximum (100%) or minimum (0%) speeds for 5 seconds.

Compressor Clutch

Output Control

The scan tool displays the A/C compressor clutch status: Engage or Disengage. This function allows you to command the A/C compressor clutch On and Off.

Driver Temp. Door

Output Control

The scan tool displays On or Off selections. The selection drives the actuator to its minimum (cold) or maximum (hot) positions for 20 seconds.

Mode Door

Output Control

The scan tool displays On or Off selections. This function drives the actuator to its minimum (defrost) or maximum (upper) positions for 20 seconds.

Passenger Temp. Door

Output Control

The scan tool displays On or Off selections. The selection drives the actuator to its minimum (hot) or maximum (cold) positions for 20 seconds.

Recalibrate All Motors

Output Control

When commanded the scan tool displays the actuators counts moving from hot to cold until the re-cal is complete.

Recirculation Door

Output Control

The scan tool displays On or Off selections. This function drives the actuator to its minimum (outside air) or maximum (recirculate) stops for 20 seconds.

Update Ambient Air Temperature Display

Output Control

The scan tool displays Commanded State: On or Off. This function updates the HVAC control module ambient air temperature input to the current raw value.

IPC Scan Tool Output Controls

Scan Tool Output Control

Additional Menu Selections

Description

Displays Test

Output Control

The scan tool displays Off or On selections. When you select On, all segments of the HVAC control module and IPC should illuminate for 5 seconds, and all gages should sweep through their full range of motion. When you select Off, all segments of the HVAC control module and IPC should be blank, and all gages should be at zero for 5 seconds.

ECM Scan Tool Output Controls

Scan Tool Output Control

Additional Menu Selections

Description

Compressor Clutch

Engine Output Controls

The scan tool displays On or Off selections. This command allows you to turn the A/C compressor clutch relay ON for 5 seconds or OFF. When the relay is commanded ON, the A/C compressor clutch should be engaged.