ICON Idle Control System – 208-001   Component Identification

The cab thermostat is a device that allows the user to set the temperature inside the cab. When the temperature exceeds either the high or low temperature threshold, the cab thermostat directs the ICON™ system to start and run the engine until the desired temperature inside the cab has been reestablished. The cab thermostat is typically mounted inside the bunk area of the cab.

At initial turn-on of the cab thermostat, the thermostat will display the revision level of the software loaded in the thermostat, that is “01”, “02”, “03”, and so forth.

Any revision of the ICON™ control module is compatible with any revision of the ICON™ thermostat, although a wiring change can possibly be required.

The ambient air temperature sensor is a sensor mounted outside the cab, under the fifth wheel. The sensor is connected to the cab thermostat. The sensor allows the ICON™ system to use the ambient air temperature as a factor in determining when to operate the engine.

The ICON™ lamp provides a visual display that shows the status of the ICON™ system. Depending on the status of the ICON™ system, the lamp either will illuminate steadily, will flash in certain patterns, or will remain off. The ICON™ lamp is mounted on the dash.

NOTE: A LED can only be used with ICON™ idle control module revision 18.

The dash relay allows the ICON™ system and engine ECM to be isolated from the electronic dash while the ICON™ system is active but the ignition bus is unpowered.

The dash relay is installed when electronic dashes interfere with the ICON™ system operation. The installation of the dash relay does not affect normal dash operation when the ICON™ system is not active.

The neutral position switch is a device that is installed on the vehicle’s transmission. The neutral position switch lets the ICON™ system know whether the vehicle’s transmission is in gear or in neutral. The switch is closed when the transmission is in neutral, and is open when the transmission is in gear. The ICON™ system will not start the engine or become active unless the transmission is in the NEUTRAL position.

The parking brake switch is a device that is installed in the vehicle’s parking brake line under the dash behind the hand valve. The parking brake switch lets the ICON™ system know whether the vehicle’s parking brake is set or released. The switch closes when the parking brakes are on and the switch opens when the parking brakes are off. The ICON™ system will not start the engine or become active unless the parking brake is set.

The ignition bus relay 1 and 2 are relays that allow the ICON™ system to control the OEM ignition circuit automatically. Under normal conditions, the operator sends power to the vehicle’s circuits by turning the keyswitch on. The ICON™ system, while active, controls these circuits with the ignition bus relays. Though the ICON™ kit includes only one relay (ignition bus relay 1), a second relay (ignition bus relay 2) can be installed to control multiple accessory packages. The ignition bus relay 1 and 2 are mounted under the dash.

The ICON™ cab harness connects all of the ICON™ system components inside the cab. The cab harness is connected to the ICON™ engine harness with a pass-through connector at the vehicle firewall.

The ICON™ engine harness connects all of the ICON™ system components in the engine bay. The ICON™ engine harness also provides primary power and grounding for the ICON™ system.

The cab thermostat harness connects the cab harness to the cab thermostat.

The temperature sensor harness connects the cab thermostat to the ambient air temperature sensor.

The ICON™ idle control module is a small, powerful computer that controls the ICON™ system. The ICON™ idle control module communicates with all the ICON™ system switches and the engine ECM on the J1587 datalink to gather data and send commands. The ICON™ idle control module controls idle speed, idle time, engine starting and stopping, ignition bus power, and overall ICON™ system control. The ICON™ idle control module is mounted on the firewall of the vehicle.

The ICON™ idle control module’s dataplate is located on the front of the idle control module and in the upper left corner. It contains the following:

1. P/N – ICON™ idle control module part number
2. S/N – ICON™ idle control module serial number

The starter relay is used by the ICON™ system to engage the engine starter. Since the engine start is automatic, the idle control module uses the starter relay to engage the starter without the necessity of an operator to push the start button or turn the key. The starter relay is mounted on the firewall of the vehicle.

Prior to automatic engine starting, the ICON™ system sounds the engine start alarm (if enabled). This alarm warns anyone near the engine that the engine is about to start. The ICON™ system allows time during this alarm for personnel to move away from places that could cause personal injury when the engine starts. The engine start alarm is mounted on the firewall of the vehicle.

WARNING  Some hood tilt switches contain Mercury, a chemical known to some state and federal agencies to cause birth defects or other reproductive harm. Do not dispose. Recycle in accordance with state regulations.

The hood tilt switch is a safety device that is installed on the vehicle’s hood. The hood tilt switch lets the ICON™ system know whether the vehicle’s hood is open or closed. The ICON™ system will not start the engine or be active unless the hood is closed.

NOTE: Some non-mercury hood tilt switches can be supplied without a bracket.

The ICON™ engine brake harness is required for Signature and ISX Series engines only. The engine brake harness reduces the number of possible engine brake levels from six to three. This allows increment and decrement drivers for ICON™ system use on Signature and ISX Series engines.

1. Engine brake connectors
2. Engine Brake harness connector