GM Service Manual Online
For 1990-2009 cars only

Powertrain Control Module

Scan Tool Output Control

Additional Menu Selection(s)

Description

Fan Relay 1

Fan Relays

The scan tool displays ON and OFF. This allows you to command the low speed fan relay ON and OFF. The engine does not need to be running for this to function. If engine is running, then the A/C must be in the OFF position or the OFF command will not function.

Fan Relay 2

Fan Relays

The scan tool displays ON and OFF. This allows you to command the high speed fan relay ON and OFF. The engine does not need to be running for this to function. If engine is running, then the A/C must be in the OFF position or the OFF command will not function.