Normal Operation

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

The headlamp switch supplies the instrument cluster with the headlamp switch position status. For additional information on the headlamp switch operation, refer to EXTERIOR LIGHTING . The dimmer switch provides the instrument cluster with the dimmer control status through signal circuit 8-LE10 (WH/BK) and return circuit 9-LE10 (BN/YE). The instrument cluster sends the illumination message to the front electronic module (FEM) over the standard corporate protocol (SCP) communication network, circuits 4-EG8 (GY/VT) and 5-EG8 (BU/WH), based upon the dimmer switch position. The FEM is supplied with illumination power through circuit 29S-DK22 (OG/YE) whenever the switched system power (SSP) is energized. For additional information on the SSP operation, refer to EXTERIOR LIGHTING . When the headlamp switch is in the PARK, HEADLAMP, or AUTOLAMP ON position, the instrument cluster sends the FEM an illumination message and the FEM, in turn, provides a pulse width modulation (PWM) power to the interior auxiliary junction box through circuit 64S-LH5 (BU/RD). The interior auxiliary junction box separates the PWM power and supplies it to joint connector 3 through circuit 64S-LK1 (BU/RD) and from joint connector 3 to the instrument cluster through circuit 64S-LK29 (BU/RD). The instrument cluster is grounded by circuit 31-A11 (BK).