211-05 Steering Wheel and Column Electrical Components	2013 - 2014 Fusion
Description and Operation	Procedure revision date: 08/29/2012

Steering Wheel and Column Electrical Components - System Operation and Component Description

System Operation

System Diagram - Push Button Start

Network Message Chart - Push Button Start

Module Network Input Messages - SCCM

Broadcast Message	Originating Module	Message Purpose
Ignition status	GWM	This message informs the BCM of the current ignition status; off, accessory, run, start, unknown or invalid.

Module Network Input Messages - BCM

Broadcast Message	Originating Module	Message Purpose
RKE data	RTM	Provides the BCM with the RKE commands and passive key information.

OFF

To enter OFF mode, press the ignition switch without pressing the brake pedal while the vehicle is in ON mode or the engine is running. The passive key does not have to be in the vehicle to achieve OFF mode. However, the passive key must be present to achieve any other ignition mode.

When the engine is running and any one of the vehicle doors is opened and then closed, the presence of a passive key is determined. If the passive key is not present, the message center displays Key not detected to alert the driver the passive key is not present.

When the ignition switch is turned to the OFF position, the BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN .

To enter ON mode, with a valid passive key inside the vehicle, press the ignition switch for a minimum of one second without pressing the brake pedal. Once the BCM and RTM indicate a valid passive key is present inside the vehicle and the BCM has detected the ignition switch input without the stoplamp switch input, the BCM activates the internal run/start relay and the BJB run/start relay, providing ignition voltage to the various vehicle systems and modules. The BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN .

START

To enter START mode, with a valid passive key inside the vehicle, press and hold the brake pedal. Then press and release the ignition switch. Once the BCM and RTM indicate a valid passive key is present inside the vehicle and the BCM has detected the ignition switch input with the stoplamp switch input, the BCM activates the internal run/start relay and the BJB run/start relay, providing ignition voltage to the various vehicle systems and modules. At this time, the PCM also receives an input from the ignition switch, initiating a sequence that ends with the starter motor activating. The BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN .

The engine can be started from any ignition mode. Once the ignition has entered START mode, the indicator in the ignition switch illuminates.

System Diagram - Conventional Ignition Switch

Network Message Chart - Conventional Ignition Switch

Module Network Input Messages - SCCM

Broadcast Message	Originating Module	Message Purpose
Ignition status	GWM	This message informs the BCM of the current ignition status; off, accessory, run, start, unknown or invalid.

OFF

When the ignition switch is turned to the OFF position, the BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN .

ACC

When the BCM receives the ACC voltage input from the ignition switch, the BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN .

When the BCM receives the on voltage input from the ignition switch, the BCM activates the internal run/start relay and the BJB run/start relay, providing ignition power to the various vehicle systems and modules. The BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN .

START

When the ignition switch is placed in the start position, the BCM receives on and start voltage inputs and the PCM receives a start voltage input from the ignition switch. The BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN .

Component Description

Multifunction Switch

The multifunction switch is a multiple position switch controlled by a lever. The multifunction switch controls the turn signal, headlamp low/high beam and headlamp dimmer/flash-to-pass functions.
Refer to: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation).

Steering Wheel Switches

The steering wheel switches are comprised of an upper and lower switch cluster mounted on each side of the steering wheel, facing the driver. The upper and lower switch clusters are integrated into a single switch and cannot be serviced separately.

The LH upper switch cluster controls the message center display.
Refer to: Message Center - Overview (413-01 Instrumentation, Message Center and Warning Chimes, Description and Operation).

The LH lower switch cluster controls the cruise control system.
Refer to: Cruise Control - Component Location (419-03A Cruise Control, Description and Operation).

The RH upper and lower switch clusters control the audio and SYNC® systems.

Refer to: Information and Entertainment System - Component Location (415-00C Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC/Sony Audio System, Description and Operation).
Refer to: Information and Entertainment System - Component Location (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Description and Operation).
Refer to: Information and Entertainment System - Component Location (415-00B Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC/Touchscreen Display, Description and Operation).

Wiper and Washer Switch

The wiper and washer switch is a multiple position switch controlled by a lever. The wiper and washer switch controls the front windshield wipers and washers.
Refer to: Wipers and Washers - Overview (501-16 Wipers and Washers, Description and Operation).

BCM - Push Button Start

The BCM determines the vehicle ignition mode based on the ignition switch input, the stoplamp switch input and RTM messages. The BCM communicates the ignition mode to the other modules over the CAN . The BCM monitors the ignition switch input and the ignition mode outputs. If a fault is detected in the ignition system, Diagnostic Trouble Codes (DTCs) are set in the BCM .
Refer to: Module Controlled Functions - Component Location (419-10 Multifunction Electronic Modules, Description and Operation).

BCM - Conventional Ignition Switch

The BCM determines the vehicle ignition mode based on the ignition switch input. The BCM communicates the ignition mode to the other modules over the CAN . The BCM monitors the ignition switch input and the ignition mode outputs. If a fault is detected in the ignition system, Diagnostic Trouble Codes (DTCs) are set by the BCM .
Refer to: Module Controlled Functions - Component Location (419-10 Multifunction Electronic Modules, Description and Operation).

RTM

Refer to: Module Controlled Functions - Component Location (419-10 Multifunction Electronic Modules, Description and Operation).

Front PATS Antenna

If the battery inside the passive key is weak, damaged or if excessive ambient Radio Frequency Interference (RFI) prevents communication between the RTM and the passive key, the backup slot located in the center console storage compartment provides a secondary means for the BCM to validate the passive key and authorize the use of the vehicle. The front PATS antenna uses passive Radio Frequency (RF) identification to exchange signals with the passive key.
Refer to: Passive Anti-Theft System (PATS) - Component Location (419-01C Passive Anti-Theft System (PATS) - Vehicles With: Push Button Start, Description and Operation).

Stoplamp Switch

The stoplamp switch is a dual contact switch. One set of contacts is normally open and receives voltage at all times. The other set of contacts is normally closed and is connected to ground.

When the normally open contacts close, the voltage is sent to the BCM and PCM .

When the normally closed contacts open, the ground circuit to the PCM is momentarily interrupted.

Ignition Switch - Without Push Button Start

The ignition switch is a multiple position rotary switch that is controlled by a lock cylinder and a key. The switch is hardwired to the BCM , PCM and the Brake Shift Interlock Actuator (BSIA).

The key removal inhibit solenoid (also known as the key release interlock actuator) is an electronically controlled solenoid that prevents the ignition lock cylinder from being turned to the OFF position unless the gear selector lever is in the PARK position. The key removal inhibit solenoid is part of the ignition switch.

Ignition Switch - Push Button Start

The ignition switch is a momentary dual contact switch that is hardwired to the BCM and PCM .

Both sets of contacts are normally open and receive voltage at all times. When the ignition switch is pressed, one set of contacts supplies ground to the BCM and the other set of contacts supplies voltage to the PCM .

The ignition switch has a LED that is used for switch illumination.