Grand Cherokee 2WD V8-4.7L VIN N (2000)
security systems that use coded signals known generically as rolling codes to increase security. The overhead console display provides visual
feedback to the driver, showing which Home Link transmitter button is pressed. As on prior models, Home Link can learn and store three separate
transmitter radio frequency codes to operate garage door openers, security gates, and security lighting. Buttons are marked with one, two or three
raised dots for identification by touch.
Self-Diagnostic Test
The self-diagnostic test is used to determine that the internal circuitry and compass are operating properly, and all PCT bus messages are being
received for initial operation. The button backlighting is also verified by flashing the bulbs for proper operation.
Initiate the self-diagnostic test as follows:
1. With the ignition switch in the OFF position, simultaneously press and hold the C/T button and the RESET button.
2. Turn the ignition switch to the ON position.
3. Continue to hold both buttons until the software versions are displayed.
4. The display will show the result of the self-diagnostics test. If the display reads:
a. PASS SELF TEST - press the RESET button to return to the compass/temperature display. The EVIC is working properly.
b. FAILED SELF TEST - an internal failure has occurred. Replace EVIC.
c. FAILED J1850 COMMUNICATION - refer to the communication .
Ambient Temperature Sensor
The thermometer function is supported by the ambient temperature sensor, a wiring circuit, the Body Control Module (BCM), the Programmable
Communications Interface (PCI) data bus, and a portion of the Electronic Vehicle Information Center (EVIC) module. If any portion of the
ambient temperature sensor circuit fails, the EVIC module will self-diagnose the circuit. A "Short Circuit" message will appear in the display in
place of the temperature, when the sensor is exposed to temperatures above 55 °C (131 °F), or if the sensor circuit is shorted. An "Open Circuit"
message will appear in the display in the place of the temperature, when the sensor is exposed to temperatures below -40 °C (-40 °F), or if the
sensor circuit is open.
EXTERIOR LIGHTING SYSTEM
Exterior Lighting Battery Saver
The BCM monitors the status of and controls the park lamp, head lamp and fog lamp relay's. If any exterior lamps are left ON after the ignition is
turned OFF, the BCM will turn them OFF after 8 minutes.
Headlamp Delay
The headlamp time delay operates when the ignition switch is turned OFF while the headlamps are still ON. This feature is customer
programmable to provide a 30, 60 or 90 second time delay before turning OFF the headlamps. This feature can also be disabled.
Headlamp Switch
The headlight switch on WJ vehicles use a multiplexed (MUX) circuit to the BCM. The BCM will then control the park lamp, low/high head lamp
and fog lamp 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.
INTERIOR LIGHTING
Courtesy Lamp Control
The body controller has direct control over all 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 and courtesy lamp switch on the left multi-function switch is not in the dome OFF position.
2. The courtesy lamp switch on the left multi-function switch is in the dome ON position.
3. A Remote Keyless entry unlock message is received.
4. Driver door unlocked with key (with VTSS only).
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. The illuminated entry feature will not
operate if the courtesy lamp switch is in the dome OFF position.
Interior Lighting Battery Saver
If any of the interior lamps are left ON after the ignition is turned OFF' the BCM will turn them OFF after 8 minutes. To return to normal
operation, the courtesy lamps will operate after the dome lamp switch or door ajar switch changes state. The glove box, switched reading lamps
and vanity lamps require that the ignition be turned to the ON/ACC position.
MECHANICAL INSTRUMENT CLUSTER (MIC)
The Mechanical Instrument Cluster (MIC) is divided into 4 sections. Primary gauges, (speedometer and tachometer) secondary gauges, (fuel level,
oil pressure, coolant temperature and charging voltage), PCI bus indicator lights and hardwired indicator lights. The gauge mechanisms are all the
