General
The lights on alarm in the instrument pack operates when the driver's door is open and the side lamps are on. The system uses inputs from
The driver's door switch
The lighting switch
A serial data bus allows communication between the Body Control Unit (BCU), the Intelligent Driver's Module (IDM) and the instrument pack.
Lights On Alarm Circuit Supply
A feed from the battery positive terminal is connected on an R wire to the engine compartment fusebox where it is connected to fusible links 8 and 12 and fuse 13.
A feed from fusible link 12 is connected on an NG wire to the lighting switch.
A feed from fuse 13 is connected on a PN wire to pin C0660-13 on the BCU. A BCU system earth is provided by a B wire connected to earth header C0551.
A feed from fusible link 8 is connected on an NW wire to the passenger compartment fusebox and from the fusebox to the ignition switch on an N wire.
Ignition Switch Circuit Supply
With the ignition switch in position II, the feed from fusible link 8 flows through the ignition switch to the passenger compartment fusebox on a Y wire. The feed continues through fuse 29 in the passenger compartment fusebox and is connected to pin C0660-1 on the BCU by a GU wire.
Lights On Alarm Operation
When the lighting switch is moved to the side lamp or the headlamp position, the feed from fusible link 12 passes through the lighting switch contacts and is connected to the passenger compartment fusebox on an R wire.
The feed passes to the Intelligent Driver's Module (IDM), which is integral with the passenger compartment fusebox. This feed is used as a 'side lights on' signal by the logic circuits in the IDM and BCU.