DTC B0688: Security Indicator Circuit Fault: Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana Special, 2001 GMC Savana Camper Special, and 2001 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
Security indicator is a hard wired light to instrument panel cluster (IPC) and controlled by Passlock(tm) module. Security indicator light receives ignition voltage form the GAUGES fuse. When DTC B0688 sets, security indicator will illuminate. Security indicator may be illuminated when ignition switch is in OFF position, if security indicator control circuit is shorted to battery voltage. Current DTCs will clear after an ignition cycle occurs without the fault recurring. Passlock(tm) module history DTCs clear after 100 ignition cycles with no current codes active or using a scan tool.