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 automatic temperature control module, 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 Remote radio switch control.

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.

DIAGNOSTIC PROCEDURE

FEATURE	DEFAULT	PROGRAMMING METHOD	FEEDBACK
Rolling Automatic Door Locks	Enabled	Close all doors Place vehicle key in the ignition and cycle between off and run four times ending in the off position Customer depresses the driver power door look switch to lock the doors Body Controller will toggle the enable/disable state of rolling locks	BCM provides a single chime to indicate completion of the programming
RKE-Horn Chirp	Enabled	Continually press the lock button for a minimum of 4 seconds to a maximum of 10 seconds Within the 4-10 second range, press the unlock button while continuing to press the lock button Release both buttons Body Controller will toggle on/off state of horn chirp feature	None
RKE-Rear Release Toggle	Press Twice	Continually press the unlock button for a minimum of 4 seconds to a maximum of 10 seconds Within the 4-10 second range, press the rear release button while continuing to press the unlock buttons Release both buttons RKE will toggle state of one press/two press rear release
RKE Program New FOB (Using an already programmed FOB)	Not Applicable	Turn vehicle ignition switch on. With programmed FOB continually press the unlock button for a minimum of 4 seconds to a maximum of 10 seconds Within the 4-10 second range, press the panic button while continuing to press the unlock button Release both buttons Press lock and unlock together and then press any button of FOB(s) to be Learned. (Note: RKE system erases all FOBs when program mode is entered So any existing FOBs must also be Programmed	BCM will sound a second chime when programming mode is started BCM will sound a second chime after each FOB has been learned, a 32 second time out period has elapsed, or the vehicle ignition has been turned off Turn off ignition or wait for 32 seconds to exit programming mode
Auto Unlock on Exit	Enabled	Close all doors Place vehicle key in the ignition and cycle between off and run four times ending in the off position Customer depresses the driver power door unlock switch to unlock the doors Body Controller will toggle the enable/disable state of auto unlock on Exit	BCM provides a single chime to indicate completion of the programming
RKE Lamp Flash	Enabled	Continually press the lock button for a minimum of 4 seconds to a maximum of 10 seconds Within the 4-10 second range, press the trunk button while continuing to press the lock button Release both buttons Body Controller will toggle on/off state of lamp flash feature	None