Circuit Description

WARNING: This page is about a different car, the 2000 Chevrolet Corvette and 1999 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Left Door Control Module (LDCM) provides illuminated output control for left door switch assembly. LDCM illuminates left door switch, memory switch, and mirror switches. LDCM provides a single power supply for all illuminated light functions. The LDCM uses Pulse-Width Modulation (PWM) ground output to control dimming level to left door switch. When LDCM receives a message on the serial data line indicating park lights or headlights are ON, LDCM will control left switch illumination by providing PWM on the ground circuit. LDCM also provides ground output for memory 1, memory 2 and left and right mirror switches.

The LDCM monitors amount of current draw on all illumination light control circuits. DTC will set when the LDCM detects short to ground in right or left mirror indicator, memory 1 or memory 2 indicator or left door switch Illumination circuits. Condition must be present for 20 milliseconds.

When DTC sets, DTC B2278 is stored as history. LDCM will disable malfunctioning indicator. This DTC can only be set as history even if malfunction is current. No driver warning message will be displayed.

DTC will clear when LDCM no longer detects a short to ground in indicator/light control circuit. Driver's Information Center (DIC) or scan tool can be used to manually clear DTC.