Intrepid V6-3.5L VIN K (2003)
relay's based on this input.
Fog Lamp Control
The body control module controls the operation of the fog lamp relay which controls the fog lamps. The fog lamps can only be on if the park or low
beam headlamps are on. If the high beams are turned on, the fog lamps will automatically be turned off.
Auto Headlamps
The headlamps and park/tail lamps will be activated by the BCM when the headlamp switch is in the auto mode. To activate the auto headlamps the
BCM requires that: (1) the headlamp switch is in the 'A position, (2) the engine is running, and (3) the light level sensed through the sun load sensor
falls below the calibrated level.
Interior Lighting
INTERIOR LIGHTING
Courtesy Lamp Control
The body controller has direct control over the majority of the vehicle's courtesy lamps. The body computer will illuminate the courtesy lamps under
any of the following conditions:
1. Any door is ajar.
2. The courtesy lamp switch on the instrument panel is closed.
3. A Remote Keyless entry unlock message is received. If the interior lamps are left on after the ignition is turned off, the BCM will turn them off
after 1 hour or until either the dome lamp switch or door ajar switch changes state.
Illuminated Entry
Illuminated entry will be initiated when the customer enters the vehicle by unlocking the doors with the key fob, or with the key if the vehicle is
equipped with vehicle theft alarm. Upon exiting the vehicle, if the lock button is pressed with a door open, illuminated entry will cancel when the door
closes. If the doors are closed and the ignition switch is turned on, the illuminated entry also cancels.
Mechanical Instrument Cluster
MECHANICAL INSTRUMENT CLUSTER
The instrument cluster displays four gauges, a vacuum fluorescent (VF) odometer, a VF PRNDL and up to (18) indicators. One reset button is used to
switch the display from trip to total. Holding the button when the display is in the trip mode will reset the trip mileage. The cluster also supplies the
power for the panel illumination. Most of the information that is displayed is received over the PCI bus from several modules.
With ignition in "lock", the cluster will wake up and display the door ajar and odometer display when a door is opened. The cluster will also wake up
to control the panel illumination. In "off" (unlock) the PRNDL and several indicators will be functional but all gauges will not function. On transition
from "off", (unlock) to run, the cluster will perform a check of all micro-controlled indicators, the odometer and the PRNDL for approx. 2 seconds.
Other bulb checks with longer bulb check duration will be performed based on bus messages from other modules. If the cluster receives no PCI bus
messages for (20) seconds after the transition to "run", the cluster will display "no bus" in the odometer.
A self test can be initiated by holding down the odometer reset button and switching the ignition from "lock" to "off', (unlock). This test will activate
the gauges, turn on the indicator lights along with the odometer and PRNDL segments.
Memory System
MEMORY SYSTEM
The memory system consists of power left front seat, power mirror(s) and radio presets. The memory heated seat/mirror module (MHSMM) also
includes the heated seat function. The module is located under the left front seat and receives input from: left manual 8-way seat switch, left seat
position sensors, memory switch, both heated seat switches, both heated seat negative temperature coefficients (NTC's) thermistors), PCI bus circuits,
and the power mirror sensors. The module uses these inputs to perform the following functions:position the drivers memory seat, exterior mirror(s),
actuate the drivers and passenger heated seat heater and send the memory location over the PCI bus.
When a memory button is pressed (either # 1 or # 2) on the memory switch the MHSMM sends a message to the BCM which in turn sends a recall
message to the MHSMM and the PCI radio. They will in turn position the drivers seat and sideview mirror(s) along with setting the radio presets. If
the drivers seat or exterior mirror(s) are inoperative from their own respected switches, use the service information and schematic to diagnose the
problem. This manual addresses the memory problems only and it is assumed there is not a basic component failure.
Power Seat
The memory power seat provides the driver with 2 position settings for the left seat. Each power seat motor is connected to the MHSMM with two
circuits. Each circuit is switched between battery and ground. By alternating the circuits the MHSMM controls the movement of the motors based on
input from the power seat switch or through memory recall.
Each motor contains a potentiometer to monitor the seat position. To monitor the position of the motor, the MHSMM sends out a 5-volt reference on
the sensor supply circuit. The sensor is grounded back to the module on a common ground circuit. Based on the position of the sensor; the MHSMM
monitors the voltage change through the sensor on a separate signal circuit.
The MHSMM stores the input value of each of the four seat potentiometers in memory when the system is requested. The driver can initiate memory
recall, using either the seat mounted memory switch or the RKE transmitter. When initiated, the MHSMM adjusts the four seat motors to match the
memorized seat position data.
