Intrepid V6-2.7L VIN R (2003)
The CD-changer contains a Load/Eject button and an indicator light for each of the four disc positions. The individual light indicates whether a CD is
currently loaded in that particular chamber of the CD-changer. Pressing the individual Load/Eject button for a particular chamber will eject a disc
currently present in that chamber. If the chamber is currently empty, actuating the Load/Eject button will position that chamber to receive and load a
new disc in that chamber.
Chime System
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
CLIMATE CONTROL SYSTEMS
Automatic Temperature Control (ATC)
The body control module (BCM) provides 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 now 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.
A feedback signal failure can occur on the blend or mode door. The body control module monitors the feedback signal to check the position of the
actuator. The body control module not only checks the level of the signal but also how much the voltage changes.
A feedback failure can occur if there is a short or open circuit in the wiring, a bad actuator, a bad body control module, a bad HVAC unit door or
connecting linkage. The easiest way to diagnose this is to use the DRB to actuate the blend or mode door. Note that the feedback voltage of the
actuator should smoothly change as the actuator is moved. A sudden change in the feedback voltage to a 5.0 volt or a 0.0 volt level indicates the
actuator is bad. A fixed feedback voltage that is less than 5.0 volts or greater than 0.0 volts without a stall failure, or a short failure indicates that the
actuator, the HVAC unit door, or a connecting mechanical linkage is jammed thereby preventing movement. A feedback signal voltage that stays on
5.0 volts or 0.0 volts indicates a wiring or body control module problem. The feedback voltage should always be less than 5.0 volts and greater than
0.0 volts.
The feedback trouble code can also occur from lack of actuator travel. This can be checked by confirming that the feedback signal smoothly changes
when the actuator is moved with the DRB. If the signal is OK, the door travel is not correct. The actuator must be removed and the HVAC unit door
mechanically checked for proper operation. Typical problems that prevent door movement include screws dropped in the HVAC unit or warped doors.
Replace any part that is found defective.
Rear Window Defogger
When the BCM receives a rear defogger request from the climate control head (either ATC or manual) the BCM will activate the rear window
defogger relay for 15 minutes. If the BCM receives another rear defogger request while the relay is still activated, the relay will be de-activated. If the
relay is allowed to time out (full 15 minutes), further requests during the same ignition on period will cause the BCM to activate the relay for 7.5
minutes.
Compass/Mini-Trip Computer / Electronic Vehicle Information Ctr
COMPASS/MINI-TRIP COMPUTER or ELECTRONIC VEHICLE INFORMATION CENTER
The Compass/Mini-Trip Computer (CMTC) or Electronic Vehicle Information Center (EVIC) is located in the overhead console. The CMTC or
EVIC supplements the standard vehicle instrumentation. The CMTC and EVIC use a vacuum fluorescent (VF) display to supply the vehicle operator
with a compass heading, outdoor temperature, average fuel economy, distance to empty, instantaneous fuel economy, trip odometer, elapsed ignition
on time, distance to service, warning messages, and service messages.
