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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1157 (Instrument Panel And Interior Switches Illumination) >> Description And Operation >> Instrument Panel and Interior Switches Illumination - System Operation and Component Description >> System Operation >> Networked Illumination Operation

Networked Illumination Operation

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The dimmable switches and components are illuminated when the parking lamps are on. The system-wide illumination dimming level is determined by the BCM. Based on the ambient light level input from the light sensor and the requested illumination dimming level input from the dimmer switch, the BCM calculates the correct dimming level. The BCM sends the illumination dimming level message to the GWM on the HS-CAN1. The GWM then distributes the message to the FCIM, DDM and PDM on the MS-CAN, to the GSM on the HS-CAN2 and to the IPC and APIM on the HS-CAN3. The DDM and PDM send the illumination dimming level data to the Driver Rear Door Module (DRDM) and Passenger Rear Door Module (PRDM) via LIN circuits.

The receiving modules use the illumination dimming level message to determine the backlighting intensity of internal and external non-networked illumination sources. If a module does not receive the illumination dimming level message or the data received is deemed invalid, the module sets a DTC in continuous memory and defaults to full nighttime intensity.

If the IPC does not receive the dimming level or ambient light level network messages from the BCM for up to 5 seconds, the IPC illumination remains at the last level based on the last message received. If the IPC receives invalid or no signals for more than 5 seconds, the IPC defaults to full night illumination level.

On vehicles equipped with autolamps, if the exterior lamps are activated during the daytime, the message center illumination remains at full intensity and does not dim from the instrument panel dimmer switch. If the vehicle travels under a bridge or through a tunnel, the low level of ambient light causes the illumination level of the message center to change to the level set by the instrument panel dimmer switch. The message center illumination changes back to full intensity when the intense ambient light is restored.

The hazard switch/active park assist (if equipped) switch assembly is integral to the FCIM and cannot be serviced separately.

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