Ford C-MAX HYBRID 2013 Modifiers Manual page 17

2-2 Electrical
Section 2: Electrical
To figure the current needed for a device rated in watts, turn the equation around: Watts/volts =
amperes. For example, if you have a piece of equipment, such as a communications radio, that
uses 120 watts: 120 watts/12 volts = 10 amperes.
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. For example, connecting 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. 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 help cool the high-voltage traction battery
(HVTB).
FCS-212235-13 March 2013