Ford Explorer: Instrument Panel and Interior Switches Illumination / Description and Operation - Instrument Panel and Interior Switches Illumination - System Operation and Component Description

Ford Explorer 2020-2022 Service Manual / Electrical / Instrumentation and Warning Systems / Instrument Panel and Interior Switches Illumination / Description and Operation - Instrument Panel and Interior Switches Illumination - System Operation and Component Description

System Operation

System Diagram - Networked Illumination


Item Description
1 APIM
2 Light Sensor
3 ACM
4 IPC
5 FDIM
6 DDM
7 PDM
8 BCM
9 RF Door Lock Switch
10 RF Door Window Control Switch
11 LF Door Window Control Switch
12 FCIM
13 RR Door Window Control Switch
14 LR Door Window Control Switch
15 LF Door Lock Switch
16 RR Door Lock Switch
17 LR Door Lock Switch
18 Dimmer Switch
19 Headlamp Switch
20 GWM
21 FCDIM
22 without Touchscreen
23 RHVAC

Network Message Chart

  Module Network Input Messages - ACM, APIM, DDM, FCIM, RHVAC, GWM, IPC and PDM.


Broadcast Message Originating Module Message Purpose
Illumination Dimming Level   BCM Used to command the illumination dimming level for networked modules and outputs that are hardwired to networked modules.

Networked Illumination Operation

The dimmable switches and components are illuminated when the parking lamps are on. The system-wide illumination dimming level is determined by the BCM using the ambient light level input from the light sensor and the requested illumination dimming level input from the dimmer switch. The BCM sends the illumination dimming level message to the GWM on the HS-CAN1.

The GWM distributes the message to the following components:

MS-CAN

  • FCIM
  • RHVAC
  • DDM
  • PDM

HS-CAN3

  • IPC
  • APIM
  • ACM

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 continuous memory DTC 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 nighttime 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 it cannot be dimmed using the illumination 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 illumination panel dimmer switch. The message center illumination changes back to full intensity when the intense ambient light is restored.

The hazard switch is integral to the FCIM and cannot be serviced separately.

System Diagram - Non-Networked Illumination


Item Description
1 BCM
2 Overhead console
3 USB hub
4 EPB switch
5 Emergency call switch
6 Start-stop switch
7 4X4 switch module
8 LH second row seat control switch
9 RH second row seat control switch
10 Third row seat control switch
11 Drive mode switch
12 Steering wheel switches
13 Light sensor
14 Dimmer switch
15 Headlamp switch
16 High idle switch
17 Lighting/siren control module
18 Liftgate release switch
19 Police package
20 LIN

Non-Networked Illumination Operation

The BCM provides voltage to the rear seat control switches and the liftgate release switch with the key ON. The illumination for these switches are non-dimmable.

For the rest of the non-networked illumination, the BCM uses the ambient light level input from the light sensor and the requested illumination dimming level input from the dimmer switch to calculate the correct dimming level. The BCM provides a pulse-width modulated voltage to the non-networked illumination sources.

Field-Effect Transistor (FET) Protection

Field-Effect Transistor (FET) protection is used to protect the BCM output drivers from damage in the event an excessive current draw is detected on a BCM output. Each illumination circuit connected to the BCM is separately protected. Refer to the System Diagram in this section to view the different groups of BCM non-networked illumination outputs. For a full description of Field-Effect Transistor (FET) protection,
Refer to: Module Controlled Functions - System Operation and Component Description (419-10 Multifunction Electronic Modules, Description and Operation).

Component Description

Dimmer Switch

The illumination dimmer switch is a momentary contact switch that is integral to the headlamp switch. The headlamp switch communicates with the BCM over a LIN circuit. When the illumination dimmer switch is pressed up or down, the requested illumination level is sent to the BCM.

    Description and Operation - Instrument Panel and Interior Switches Illumination - Overview

    Overview Dimmable Illumination Dimmable illumination provides backlighting to switches and control components when the parking lamps are on. The instrument panel dimmer switch is used to increa..

    Diagnosis and Testing - Instrument Panel and Interior Switches Illumination

    Diagnostic Trouble Code (DTC) Chart Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Informati..

    Other information:

    Ford Explorer 2020-2022 Service Manual: Diagnosis and Testing - Lane Keeping System


    Diagnostic Trouble Code (DTC) Chart Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).   Diagnostic Trouble Code Chart Module   DTC Description Action   CCM C0072:0..

    Ford Explorer 2020-2022 Service Manual: Removal and Installation - Headlamp Control Module (HCM)


    Removal NOTE: This step is only necessary if the HCM is being replaced. NOTE: If installing a new module, it is necessary to upload the module configuration information to the scan tool prior to removing the module. This information must be downloaded into the new module after installation...

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    Gauges

    4 Inch Display

    A - Tachometer.

    B - Information display.

    C - Speedometer.

    D - Fuel gauge.

    E - Engine coolant temperature gauge.

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