Underhood Convenience Lamp

Voltage is supplied to the Underhood Lamp from CKT 640. CKT 640 receives battery voltage when the MONITORED LD Micro Relay #43 has closed its contact switch. The opening and closing of the MONITORED LD Micro Relay #43 is controlled by the Body Control Module (BCM) through CKT 1393. The BCM will ground CKT 1393 under normal operating conditions and energize the relay which in turns energizes CKT 640. Battery voltage is then supplied to the Underhood Lamp and it becomes functional. The BCM will monitor CKT 640 at the BCM connector C2 terminal C4 for an inadvertent load. In the event that the Underhood Lamp is inadvertently left ON, the BCM

will remove the ground from CKT 1393 de-energizing the MONITORED LD Micro Relay #43 and removing battery voltage from CKT 640. This function is used to help prevent the battery from losing voltage over a period of time in the case of a load being left ON. The Underhood Lamp is grounded by CKT 150 through Splice Pack #102 to G102.