Table of Contents
Advertisement
8W - 45 - 12
DESCRIPTION AND OPERATION
DOOR AJAR WARNING . . . . . . . . . . . . . . . . . . . 12
DOOR LOCK INHIBIT . . . . . . . . . . . . . . . . . . . . . 12
EXTERIOR LAMP-ON WARNING . . . . . . . . . . . . 12
FUNERAL MODE DISPLAY ILLUMINATION . . . . 13
HELPFUL INFORMATION . . . . . . . . . . . . . . . . . . 13
DESCRIPTION AND OPERATION
INTRODUCTION
The Body Control Module (BCM) is used to supply
the vehicles occupants with visual and audible infor-
mation, control various vehicle functions, and provide
a centralized power distribution for the passenger
compartment. To both provide and receive vehicle
information the BCM is interfaced to the CCD Bus.
Power for the BCM is supplied from four sources.
One is the M1 circuit. This circuit is HOT at all
times, and is the Ignition-Off Draw (IOD) circuit.
This circuit is protected by a 10 amp fuse located in
cavity 5 of the junction block.
Power is also supplied to the BCM on circuit A21.
This circuit is HOT when the ignition switch is in the
START/RUN position only, and connects from the
ignition switch to the BCM. Power for the A21 circuit
is supplied by circuit A1. Circuit A1 is connected
between the PDC and the ignition switch and is pro-
tected by a 20 amp fuse located in cavity 8 of the
PDC.
Circuit F11, which is HOT when the ignition
switch is in the OFF/RUN/START position, supplies
a constant feed to the BCM. This circuit is protected
by a 10 amp fuse located in cavity 11 of the junction
block. Power for the fuse is supplied on circuit A81
from the ignition switch. Circuit A81 receives its
power from circuit A1 which originates in the PDC
and is protected by a 20 amp fuse located in cavity 8.
Circuit F135 also supplies power to the BCM and
is protected by a 15 amp fuse located in cavity 9 of
the junction block. This circuit is used for the feed to
the power door lock motors.
Ground for the BCM is provided by circuits Z1 and
Z2. These circuits terminate at the instrument panel
left side cowl.
CCD Bus interface is accomplished on circuits D1
and D2. The D1 circuit is used for Bus (+), and D2 is
for Bus (-).
8W - 45 BODY CONTROL MODULE
8W-45 BODY CONTROL MODULE
page
INDEX
ILLUMINATED ENTRY . . . . . . . . . . . . . . . . . . . . 12
INSTRUMENT PANEL LAMP DIMMING . . . . . . . . 13
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 12
KEY-IN IGNITION WARNING . . . . . . . . . . . . . . . 13
SEAT BELT WARNING . . . . . . . . . . . . . . . . . . . . 12
ILLUMINATED ENTRY
On vehicles equipped with Remote Keyless Entry
(RKE) the Body Control Module (BCM) will turn ON
the interior lamps with a valid UNLOCK signal from
the RKE transmitter. When the signal is received the
BCM provides a ground path for circuit M2. This
causes the interior lamps to illuminate. The BCM
also controls the amount of time ON for the lamps.
SEAT BELT WARNING
The seat belt chime is used to indicate to the oper-
ator that the seat belt is not fastened when the igni-
tion switch is in the RUN position. The seat belt
switch, located in the left B-Pillar, is normally OPEN
with the seat belt buckled. Circuit G10 is connected
between the Body Control Module (BCM) and the
switch. Ground for the switch is provided on circuit
Z1. The Z1 circuit terminates at the deck lid ground.
EXTERIOR LAMP-ON WARNING
The exterior lamp ON chime is used to indicate to
the operator that the lamps are ON with the drivers
door OPEN and the key removed from the ignition.
The Body Control Module (BCM) uses information
from circuit L7 to determine if the lamps are ON,
and circuit G75 for drivers door ajar. The chime func-
tion will not operate when the headlamp delay fea-
ture is active.
DOOR AJAR WARNING
This feature is used to alert the operator the driv-
ers door is ajar while the vehicle is in motion. The
Body Control Module (BCM) uses information on
vehicle speed from the CCD Bus and circuit G75
which connects to the drivers door ajar switch.
DOOR LOCK INHIBIT
When the Key-In switch is CLOSED (circuit G26
connected to circuit Z1) the Body Control Module
(BCM) ignores the operators request for power door
lock operation.
JA
page
Advertisement
Chapters
Table of Contents
