Sunfire L4-2.2L VIN F (2002)
Body Control Module: Description and Operation
Body Control Module 3
BCM WAKE-UP/SLEEP STATES
The BCM is able to control or perform all of the BCM functions in the wake-up state. The BCM enters the sleep state when active control or
monitoring of system functions has stopped, and the BCM has become idle again. The BCM must detect certain wake-up inputs before entering the
wake-up state. The BCM monitors for these inputs during the sleep state, where the BCM is able to detect switch transitions that cause the BCM to
wake-up when activated or deactivated. Multiple switch inputs are needed in order to sense both the insertion of the ignition key and the power mode
requested. This would allow the BCM to enter a sleep state when the key is IN or OUT of the ignition.
The BCM will enter a wake-up state if any of the following wake-up inputs are detected:
^
Activity on the serial data line.
^
Detection of a battery disconnect and reconnect condition.
^
Headlamps are on.
^
Ignition is turned ON.
^
Key-in-ignition switch.
^
Parklamps are on.
The BCM will enter a sleep state when all of the following conditions exist:
^
Ignition switch is OFF.
^
No activity exists on the serial data line.
^
No outputs are commanded.
^
No delay timers are actively counting.
^
No wake-up inputs are present.
If all these conditions are met the BCM will enter a low power or sleep condition. This condition indicates that the BCM, which is the PMM of the
vehicle, has sent an OFF-ASLEEP message to the other systems on the serial data line.
BODY CONTROL MODULE
The various BCM input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The Body
Control Module functions include the following.
^
Retained Accessory Power, RAP, Audio System only. Refer to Retained Accessory Power (RAP) Description and Operation
^
A/C compressor request. Refer to Air Temperature Description and Operation
^
Remote Function Control. Refer to Keyless Entry System Description and Operation
^
A/C cooling Fan. Refer to Air Delivery Description and Operation
^
Exterior and interior lighting control, Refer to Exterior Lighting Systems Description and Operation
-
Daytime Running Lights (DRL)
-
Automatic lighting control
-
Fog lamps
^
Interior lighting. Refer to Interior Lighting Systems Description and Operation
^
Battery rundown protection (Inadvertent Power). Refer to Interior Lighting Systems Description and Operation
^
Chimes. Refer to Audible Warnings Description and Operation
-
Key In Ignition
-
Head Lamps On
-
Seat Belt Not Fastened
-
Turn Signal On
-
Park Brake Warning
-
Door Ajar Warning
-
Check gauges
^
Gauge control. Refer to Instrument Panel Cluster (IPC) Description and Operation.
^
Instrument cluster indicator control. Refer to instrument Panel Cluster (IPC) Description and Operation
^
Theft deterrent. Refer to Theft Systems Description and Operation
^
Engine coolant level sensing. Refer to Cooling System Description and Operation
^
Key-in-ignition sensing. Refer to Audible Warnings Description and Operation
^
Brake fluid level sensing. Refer to Brake Warning System Description and Operation
^
Parking brake state sensing. Refer to Brake Warning System Description and Operation
^
Rear compartment interface. Refer to Power Door Locks Description and Operation
^
Horn interface. Refer to Horns System Description and Operation
^
Door lock interface. Refer to Power Door Locks Description and Operation
^
Bulb Check. Refer to Instrument Panel Cluster (IPC) Description and Operation.
^
ETS -Pontiac Only. Refer to ABS Description and Operation
^
A/T Shift lock control. Refer to Automatic Transmission Shift Lock Control Description and Operation
