GM Service Manual Online
For 1990-2009 cars only

PCM -- 5.7 Liter LS1

Scan Tool Output Control

Additional Menu Selection(s)

Description

Fan Relay 1

Fan Relays

The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM and activate or deactivate the cooling fan 1 relay, manually turning the low speed fans On and Off.

Fan Relay 2 and 3

Fan Relays

The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM to activate or deactivate the cooling fan 2 and 3 relays, manually turning the Right High speed fan On.

Fan Relay 1, 2 & 3

Fan Relays

The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM to activate or deactivate the cooling fan 1, 2 & 3 relays, manually turning both High speed fans On.