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GENERAL INFORMATION
allow the rear defrost to operate in the RUN posi-
tion. This circuit is electronically controlled and
continuously monitored for malfunctions.
3.8.3 ELECTRICAL INPUTS
Headlamp battery supplies 1 & 2 — 12 volt
input on pins 1 and 2. Battery supply voltage for
switching headlamp circuits only.
Module battery supply — 12 volt input on pin 9.
Battery supply voltage for all other FCM opera-
tions.
Power ground — Ground source on pin 8 for all
FCM operations.
Ignition switch RUN or START position status
— 12 volt input on pin 37. Allows the FCM to
determine the ignition switch status for related
FCM operations.
Ignition switch START only status — 12 volt
input on pin 19. Allows the FCM to discriminate
between RUN/START input and START for related
FCM operations.
PCI Bus — Approximately 7.5 volt input on pin 22.
Allows the FCM to communicate with other mod-
ules on the vehicle bus.
Stop lamp Switch status — 12 volt input on pin
44. Provides for brake shift interlock function.
Horn Switch — Ground input on pin 17. Primary
means for engaging the horn.
Back-up switch — Ground input on pin 39. Input
is converted to a PCI Bus status message for use by
other modules.
Wiper park switch — Ground input on pin 16.
Used to determine park placement of wipers. Also
used as feedback to FCM to determine correct
operating mode of wipers.
Washer fluid level switch — Ground input to
pull-up on pin 18. Ground is switched into the
circuit when washer bottle fluid level is low.
Brake fluid level switch — Ground input to
pull-up on pin 36. Ground is switched into the
circuit when brake fluid level is low.
Ambient temperature sensor — Resistive input
to pull-up on pin 25. Corresponding voltage level is
converted to a PCI Bus message for use by other
modules on the bus.
Right park lamp outage — 12 volt input on pin
21. Used to determine if right park lamp circuit is
operating properly.
Left park lamp outage — 12 volt input on pin 41.
Used to determine if left park lamp circuit is
operating properly.
Battery IOD — 12 volt input on pin 20. The FCM
enters a low power consumption mode when the
ignition is turned OFF. This low current draw
battery supply keeps the microprocessor function-
ing in the low power mode.
Battery (+) connection detection — 12 volt
input on pin 38. The battery connection on the PDC
incorporates the use of an internal switch to deter-
mine if the connector is properly mated and the
Connector Positive Assurance (CPA) is engaged. If
the CPA is not properly engaged, a voltage on pin 38
will be interpreted as an unseated connector and a
fault will set.
Flash programming voltage — 20 volt input on
pin 42. When a DRBIII
proper flash reprogramming sequence is selected,
the 20 volt signal will be applied through pin 42.
3.9 HEATING & A/C SYSTEM
3.9.1 AUTOMATIC TEMPERATURE
CONTROL (ATC)
CAUTION: Automatic Temperature Control
(ATC) Modules with software versions 41 and
0A used in 2001 and 2002 RS/RG vehicles are
NOT compatible with software versions 13
and 0F used in 2003 RS/RG vehicles. Do NOT
install an ATC Module with software version
41 or 0A in a 2003 RS/RG vehicle or an ATC
Module with software version 13 or 0F in a
2001 or 2002 RS/RG vehicle. Use the DRBIII
to verify which version software the ATC
Module is using by selecting Body Systems,
Automatic Temperature Control, and then
selecting Module Display.
3.9.1.1 SYSTEM AVAILABILITY
EXCEPT EXPORT
•
The ATC system is a Three-Zone Air Conditioning
System.
EXPORT
•
Two different types of systems are currently
available for these vehicles.
Dual-Zone Air Conditioning System for all
vehicles with 2.4L and 2.5L engines and all
SWB vehicles with 3.3L engines.
Three-Zone Air Conditioning System for all
LWB vehicles.
16
is connected and the
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