Body Control Module

BODY CONTROL MODULE (BCM)
The Body Control Module (BCM) is concealed below the driver side end of the instrument panel in the passenger compartment, where it is secured to the dash panel side of the Junction Block (JB).

The BCM utilizes integrated circuitry and information 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 transmission of electronic message outputs to other electronic modules in the vehicle over the PCI data bus.

The Body Control Module (BCM) is designed to control and integrate many of the electronic features and functions of the vehicle. The microprocessor-based BCM hardware and software monitors many hard wired switch and sensor inputs as well as those resources it shares with other electronic modules in the vehicle through its communication over the PCI data bus network. The internal programming and all of these inputs allow the BCM microprocessor to determine the tasks it needs to perform and their priorities, as well as both the standard and optional features that it should provide. The BCM programming then performs those tasks and provides those features through both PCI data bus communication with other electronic modules and through hard wired low current outputs to a number of relays. These relays provide the BCM with the ability to control numerous high current accessory systems in the vehicle.

The BCM monitors its own internal circuitry as well as many of its input and output circuits, and will store a Diagnostic Trouble Code (DTC) in electronic memory for any failure it detects. These DTCs can be retrieved and diagnosed using a DRBIII scan tool. Refer to the appropriate diagnostic information.

Body Control Module Part 1 Of 2:

Body Control Module Part 2 Of 2:

BODY CONTROL MODULE
The Body Control Module (BCM) supplies vehicle occupants with visual and audible information and controls various vehicle functions. To provide and receive information, the module is interfaced to the vehicle's serial bus communications network (the Programmable Communication Interface or PCI bus). This network consists of the Body Control Module (BCM), Powertrain Control Module (PCM), Sentry Key Immobilizer Module (SKIM), the Transmission Control Module (TCM), the Electro/Mechanical Instrument Cluster (MIC), Compass/Mini-Trip Computer (CMTC), Airbag Control Module (ORC), optional Antilock Brakes (ABS), the optional radio and remote CD-player. The (BCM) is operational when battery power is supplied to the module, ignition switch power is needed for ignition switched functions.

The Body Control Module provides the following features:
- A/C switch status/evaporator temperature status
- BCM diagnostic support
- Central lock and unlock (VTSS only)
- Climate Control system support
- Door ajar switch status
- Door Lock Inhibit (key in ignition or headlamps/park lamps on)
- Electronic Odometer Support
- Headlamp Time Delay
- Illuminated Entry with "fade to off"
- Interior lighting with battery save feature
- Mechanical Instrument Cluster (fuel level, dim data, odometer & warning chime) support
- Travel information system
- Power convertible top
- Power door lock multiplexing control
- Rear Window Defogger Control
- Remote Keyless Entry with Panic Mode
- Remote power deck lid release
- Rolling door lock control (customer programmable)
- Sentry key immobilizer support
- Vehicle Theft Security System
- Wiper Control (speed sensitive with return to park)

The BCM receives information over the PCI Bus from the PCM in order to support certain features. The required information is as follows:
- Engine RPM
- Engine Temperature
- Injector on Time and Distance Pulses
- Vehicle Speed
- Charging System Failure, Engine Temperature Limp-In, VTSS Arming Status
- Engine Model
- "Check Engine" lamp status

The BCM provides the PCM with information on the A/C switch status and the VTSS status.

The JR has several customer programmable features which can be disabled or enabled by the customer.