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 powertrain control module (PCM), the memory heat seat/mirror module (MHSMM), sentry key immobilizer module (SKIM), the electro/mechanical instrument cluster (MIC), the optional overhead travel information system (OTIS), airbag control module (ORC), optional antilock brakes (ABS), the radio and remote CD player, optional left and right side impact airbag control modules (SIACM), and the optional automatic temperature control (ATC) head. 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:

Automatic headlamp and fog lamp

A/C switch status/evaporator temperature status

BCM diagnostic support

Central lock and unlock (VTSS only)

Chime

Climate Control (Automatic and Manual) system support

Door ajar switch status

Door Lock Inhibit (key in ignition or headlamps/park lamps on)

Electronic Odometer Support

Fog Lamp Control

Headlamp multiplexing control

Headlamp, Park & tail lamps with battery save feature

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

Memory system (LHS and 300M)

Overhead travel information system

Power door lock multiplexing control

Rear Window Defogger Control

Remote Keyless Entry with Panic Mode

Remote power deck lid release

Remote radio control

Rolling door lock control (customer programmable)

Sentry key immobilizer

Speed proportional steering

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