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2-2 Electrical
Section 2: Electrical
Control Modules — Red Area
Do not install any components into the control modules or module harness. Connecting into this
system may affect control module operation. As an example: connection of aftermarket electrical
equipment into the brake light circuit or any other circuit which is connected to the PCM, anti-lock
brake computer, air bag system or any other vehicle system will cause vehicle malfunction.
Controller Area Network (CAN) Bus
NOTICE: Wiring faults in the controller area network (CAN) bus may shut down the vehicle
and prevent further operation.
Do not splice or connect any equipment to the controller area network (CAN) bus wiring.
General Electrical Considerations
Communication Equipment
Mobile communication systems may harm the operation of the vehicle, particularly if they are not
properly designed for automotive use or are not properly installed. For example, when operated,
such systems may cause the engine to stumble or stall. Citizen band (CB) transceivers, garage
door openers and other transmitters whose power output is 5 watts or less will not ordinarily affect
the operation of the vehicle.
Vehicle Speed Signal
The vehicle speed signal is sent from the PCM to other vehicle modules through the CAN bus.
There is no specific wire or circuit that carries the vehicle speed signal pulses.
Disabling Brake Lights
Do not disable the brake light circuits for any reason.
Disabling the A/C System
Do not disable the A/C system. The cabin air is used to cool the high voltage traction battery
(HVTB).
High- and Low-Voltage Systems
NOTICE: Do not splice the high-voltage system. Voltage in the system is in the range of 216
to 397 volts. Damage may occur to equipment added to the system.
2010 Escape Hybrid, Mariner Hybrid Modifiers Guide, 07/2009