Service manual

The Switched Outputs are each switched by relays in the Block. Four of these circuits

are operated by the push button switches and turned off when the ignition goes off and

by a twenty-minute timer. An opening of a door or ignition resets this timer.

The ignition holds the timer in reset, so these outputs will stay on all the time the igni-

tion is on. These outputs will all be shut off when the ignition is turned off. If they are

turned on after the ignition is turned off, they remain on for twenty minutes.

The timer has two speeds, which are dependent on the incoming battery voltage. If the

battery is higher than 12.1 volts, the clock runs at its normal speed. If the battery drops

below 12.1 volts, the clock speeds up approximately 10 times so the timer will shut off

in about 2 minutes instead of the normal 20 minutes.

Lights as well as the Courtesy Lights Output, are also controlled by the door pin

switches to provide the courtesy light feature. They will come on when a door is opened

and stay on for twelve seconds after all the doors are closed. If any door is left open,

the lights will automatically turn OFF in twenty minutes. To turn them ON again, ALL

doors must be closed in order to reset the Smart Fuse Block and then resume opera-

tion.

All the switch panels operate from a common three-wire cable. These wires are used

for back lighting, ground and switch signal. The Smart Fuse Block IPX switches loads

by utilizing Intellitec’s proprietary multiplexing system. This system is a time division

type which ten, repetitive “time slots” are used to control the various functions of the

system. This allows two way communications between the Block, other modules, and

switch panels. With this capability, each switch panel can have on/off indicators for the

various functions that operate from the three inter-connecting wires. When one of the

switches is pressed, a signal for that particular channel is transmitted on the multiplex

communication line. A control located either in the Block or other module of the system

responds by turning that function on and off and it in turn sends out a signal on the

same line to “tell” the associated indicators on the switch panels to illuminate.

Battery and Ignition Circuits

The Smart Fuse Block IPX does not control the Battery and Ignition circuits. Power to

these outputs is brought into the fuse block from the OEM wiring and is fused on the

block.

The Battery fuses are used for circuits that feed intermittent or uninterruptible loads,

such as power sofa and 12 volt outlet, which may be used to supply a 12-volt cooler.

The ignition fuses are used for circuits that feed loads that should operate only when

the ignition is turned on, such as the rear fan.

The Timer has two speeds, which are dependent on the incoming battery voltage. If the

battery is higher than 12.1 volts, the clock runs at its normal speed. If the battery drops

below 12.1 volts, the clock speeds up approximately 10 times so the timer will shut off

in about 2 minutes instead of the normal 20 minutes.