ELECTRONIC CONTROL MODULES
TABLE OF CONTENTS
page page
BODY CONTROL MODULE
DESCRIPTION ..........................1
OPERATION ............................1
REMOVAL .............................3
INSTALLATION ..........................3
CONTROLLER ANTILOCK BRAKE
DESCRIPTION ..........................3
OPERATION ............................3
REMOVAL .............................4
INSTALLATION ..........................4
DATA LINK CONNECTOR
DESCRIPTION ..........................4
OPERATION ............................4
POWERTRAIN CONTROL MODULE
DESCRIPTION
OPERATION - SENSOR RETURN - PCM
INPUT ...............................4
OPERATION - DATA BUS COMMUNICATION
RECEIVE - PCM INPUT ..................5
OPERATION - IGNITION SENSE - PCM
INPUT ...............................5
OPERATION - PCM GROUND .............5
OPERATION
OPERATION ..........................5
OPERATION - 5 VOLT SUPPLY - PCM
OUTPUT .............................6
STANDARD PROCEDURE - OBTAINING
DIAGNOSTIC TROUBLE CODES ...........6
REMOVAL .............................6
INSTALLATION ..........................7
BODY CONTROL MODULE
DESCRIPTION
The Body Control Module (BCM) is located in the
passenger compartment, attached to the left cowl
panel underneath the left side of the instrument
panel.
The BCM utilizes integrated circuitry and informa-
tion carried on the Programmable Communications
Interface (PCI) data bus network along with many
hard wired inputs to monitor many sensor and
switch inputs throughout the vehicle. In response to
those inputs, the internal circuitry and programming
of the BCM allow it to control and integrate many
electronic functions and features of the vehicle
through both hard wired outputs and the transmis-
sion of electronic message outputs to other electronic
modules in the vehicle over the PCI data bus.
BATTERY SAVE MODE
The BCM has a battery save mode. This provides
the customer with the ability to conserve battery
power when storing the vehicle for up to three
months without losing radio and Powertrain Control
Module (PCM) memory. This is an alternative to dis-
connecting the battery negative cable.
OPERATION
The Body Control Module (BCM) supplies vehicle
occupants with visual and audible information and
controls various vehicle functions. To provide and
receive information, the BCM is interfaced to the
vehicle’s serial bus communications network, referred
to as the Programmable Communications Interface
(PCI) data bus.
This network consists of the;
• Audio system equipped with RBQ radio.
• Controller Antilock Brake (CAB)
• ElectroMechanical Instrument Cluster (EMIC)
• HVAC Control Module
• Occupant Restraint Controller (ORC)
• Powertrain Control Module (PCM)
The BCM is operational when battery power is
supplied to the module and after the ignition is
FIRST powered to RUN or the driver side exterior
door handle is pressed.
The BCM provides the following features:
• Automatic Door Locks
• Battery Protection - The BCM will automatically
turn off all exterior lamps after 3 minutes, and all
interior lamps after 15 minutes after the ignition is
turned off, if they are not turned off by the driver.
• Battery Save Mode
• BCM Diagnostic Reporting
• Chime Control
• Deck lid Release (RKE only)
• Door Entry
• Door Lock Inhibit - This feature disables the
door lock functions if the key is in the ignition and
either front door is ajar. Pressing the Remote Keyless
ZB ELECTRONIC CONTROL MODULES 8E - 1
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