Description & Operation: Notes

WARNING: Vehicle is equipped with air bag supplemental restraint system. Before attempting ANY repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEM article.

The Central Control Module (CCM) performs the following functions:

Ambient light signal processing
Chime control
Courtesy light control
Delayed Accessory Bus (DAB) control
Dimming control
Driver Information Center (DIC) switches
Fuel level detection/processing
Instrument panel LCD digit display
Personal Automotive Security System (PASS)-Key(R)
Passive Keyless Entry (PKE)
Rear defog control
Odometer processing
Oil level monitoring
Status warnings
System component malfunction detection
System diagnostics processor/controller
Trip computer processing
UART serial communications master
Universal Theft Deterrent (UTD) control
Vehicle speed detection/processing

Signals that activate the CCM are known as "wake-up" signals. CCM is asleep when it is not controlling or monitoring any wake-up functions. CCM will wake-up when any of the following occur:

Passive Keyless Entry (PKE) transmitter comes in range.
Key is inserted in door lock switch.
Door ajar switch is activated.
Power door lock/unlock switch is activated.
Hatch ajar switch is activated.
Key is inserted into ignition switch.
Ignition is turned ON.
Parking lights are turned ON.

When CCM is awake and wake-up signals are removed, CCM will return to sleep after 5-15 seconds. If CCM sees engine RPM while awake, CCM will stay awake for about 30 seconds after ignition is turned off and all wake-ups are removed, including removing ignition key. CCM will stay awake for 30 minutes if key is in ignition but ignition switch is not in START or RUN position.

If CCM receives a door ajar wake-up signal and wake-up remains active after 15 minutes, CCM will turn off courtesy light (if illuminated) to prevent battery drain. If CCM receives a hatch ajar wake-up signal and hatch remains open, but all other wake-ups are removed, CCM will go to sleep after 10 minutes. However, cargo lights will remain illuminated until hatch is closed.

CCM battery terminals operating current should not exceed one amp while CCM is awake. An approximate normal value is 200 milliamps. If delayed accessory bus is active, amperage may be higher. Delayed accessory bus allows operation of power windows and radio until a door is opened or 15 minutes has elapsed. When CCM is asleep, current should not exceed 15 milliamps. CCM IGN 1 and IGN 3 terminals operating current should not exceed 100 milliamps. See WIRING DIAGRAMS . Most CCM functions will properly operate with a system voltage of 9-16 volts.