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, Displayed Accessory Bus (DAB) control, dimming control, Driver Information Center (DIC) switches, fuel level detection/processing, instrument panel LCD digit display, Personalized Automotive Security System (PASS-Key(R)), Passive Keyless Entry (PKE) system interaction, rear defog control, odometer processing, oil level monitoring, status warnings (CHECK GAUGES indicator), system component malfunction detection, system diagnostics processor/controller, trip computer processing, UART serial communications master, Universal Theft Deterrent (UTD) control, and 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 the following wake-up functions: valid PKE transmitter comes in range, key in door switch, door ajar switch, hatch ajar switch, key in ignition switch, ignition on (IGN 3), and parking lights or headlights on.

When CCM is awake and wake-up signal is removed, after 5-15 seconds, CCM will return to sleep. 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. Most CCM functions will properly operate with a system voltage of 9-16 volts.