300M V6-3.5L VIN G (2000)
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
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:
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Engine RPM
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Engine Temperature
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Injector on Time and Distance Pulses
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Vehicle Speed
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Charging System Failure, Engine Temperature Limp-In, VTSS Arming Status
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Engine Model
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"Check Engine" lamp status
The BCM provides the PCM with information on the A/C switch status, battery temperature which is determined by the ambient temperature
sensor and the "OK to Start" or VTSS status.
The LH has several customer programmable features which can be disabled or enabled by the customer.
Chime System
The chime system is comprised of an audible chime located internal to the BCM; and is dependent on various inputs to the BCM to operate. These
inputs include key-in ignition switch, exterior lamps, seat belt switch, and requests from the MIC to chime when some indicators are turned ON.
Climate Control Systems
Automatic Temperature Control (ATC)
The body control module (BCM) provides for automatic temperature control support both through PCI bus communications and through
processing inputs to determine control for actuators and the blower motor. The BCM interfaces with the ATC control head over the PCI bus.
Information on button activation, blower setting, and temperature setting are supplied to the BCM. In turn, the BCM supplies the ATC control
head with mode information and indication lamp status. The BCM controls blower motor speed by providing a varying duty cycle of a fixed
frequency output (pulse width modulation). There are 14 distinct blower speeds, plus a blower OFF signal. The body control module also controls
the HVAC mode, temperature (blend air), and recirculation doors. This system is either fully automatic or fully manual control (no semiautomatic
functions); however, the temperature blend door control is always automatically controlled based on sensor reading and comfort setting. The in-car
sensor and the aspirator motor are 5/10/99 housed in the ATC control head.
Manual Temperature Control
The body control module interfaces with the A/C heater control head via hardwired circuits. Information for the temperature setting is supplied to
the body control module via a potentiometer. The rear defogger switch, A/C switch and the mode setting is supplied via a resistive multiplexed
circuit. The system ON/OFF status is supplied by a dedicated circuit. The BCM drives the A/C and rear defogger indicator lamps via hardwire to
the A/C heater control head.
HVAC Blend, Mode, and Recirculation Door Operation
The trouble codes that indicate a stall failure or a feedback signal failure work together to show what is wrong with the HVAC system. The stall
trouble codes mean that the body control module cannot force an actuator to the end of the HVAC unit door.
Internal problems in the body control module will set other short-related codes. Having only stall trouble codes indicates that there is a problem
with an open or short circuit in the wiring, a bad actuator, a bad HVAC unit door or connecting linkage. It is important that the operation of the
HVAC door be checked if an actuator is removed. This can be checked by rotating each unit door shaft to confirm that the door will stop at both
ends of travel. The actuator itself has no stops. It must have the HVAC unit door to stop travel to pass a stall test.
