Circuit Description

Left window switch on master switch assembly provides input to Left Door Control Module (LDCM) when left window switch is depressed to UP or DOWN position. This input allows LDCM to detect a left window up or down request. LDCM provides both power and ground to master window switch assembly. When left window switch is depressed to UP or DOWN position, ground is supplied through left window switch and left window up or down input is pulled low. When LDCM detects low voltage on left window up or down switch input circuit, LDCM will command left window up or down. When switch is released, LDCM will command left window to stop (window express down feature not activated). LDCM monitors both left window input circuits and determines how long ground had been applied. If ground is applied for longer than expected, a malfunction is present and a DTC will set.

DTC B2202 will set if LDCM detects a low voltage level (short to ground) at left window up switch input circuit. This condition must exist for more than 20 seconds. DTC B2202 will store as a history code in LDCM memory. No driver warning will be displayed.

Under all fault conditions, DTC B2202 will clear automatically when LDCM no longer detects a low voltage level (short to ground) at left window up switch input circuit for longer than 20 seconds. Current and history DTCs can be cleared using scan tool or on-board diagnostics.