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GENERAL INFORMATION
For the CMTC/EVIC: Depress the STEP or RE-
SET button, or cycle the ignition switch and the
CMTC/EVIC will return to normal operation.
For the C/T: Depress the C/T or US/M button, or
cycle the ignition switch and the CT will return to
normal operation.
If a Communication fault is displayed, refer to the
symptom list. If a FAIL or FAILED is displayed, the
CT/CMTC/EVIC must be replaced.
3.14.6 AMBIENT TEMPERATURE SENSOR
The ambient air temperature is monitored by the
FCM and displayed by the CT/CMTC/EVIC. The
FCM receives a hardwire input from the ambient
temperature sensor (ATS).
The ATS is a variable resistor that operates on a
5-volt reference signal circuit hardwired from the
FCM. The resistance in the ATS changes as the
outside temperature rises or falls. The FCM senses
the change in reference voltage through the ATS
resistor. Based on the resistance of the ATS, the
FCM is programmed to correspond to a specific
temperature. The FCM stores and filters the ambi-
ent temperature data and transmits this data to the
CMTC/EVIC via the PCI Bus. The ATS cannot be
adjusted or repaired and, if faulty or damaged, it
must be replaced.
3.14.7 AMBIENT TEMPERATURE SENSOR
FAULT CODES
The outside temperature function is supported by
the ambient temperature sensor (ATS), a signal and
ground circuit hardwired to the FCM, and the
CMTC/EVIC display.
If the CMTC/EVIC display indicates 54°C (130°F)
or the ATS sense circuit is shorted to ground, the
temp display will be 54°C (130°F) to indicate a
SHORT circuit condition.
If the CMTC/EVIC display indicates -40°C
(-40°F) or the ATS sense circuit is open, the temp
display will be -40°C (-40°F) to indicate an OPEN
circuit condition.
If there is an OPEN or SHORT circuit condition,
it must be repaired before the CMTC/EVIC VFD
can be tested.
The ATS is supported by the FCM. Ambient
Temperature Sensor DTCs will be recorded in the
FCM. The ATS can be diagnosed using the following
Sensor Test. Test the ATS circuits using the diag-
nostics in the Body Diagnostic Procedures Manual.
If the CMTC/EVIC passes the self-test, and the
ATS, the circuits, and PCI bus communications are
confirmed to be OK, but the CMTC/EVIC tempera-
ture display is inoperative or incorrect, replace the
FCM.
AMBIENT TEMPERATURE SENSOR TEST
1. Turn the ignition OFF.
2. Disconnect the ATS harness connector.
3. Measure the resistance of the ATS using the
following min/max values:
•
0° C (32° F) Sensor Resistance = 29.33 - 35.99
Kilohms
•
10° C (50° F) Sensor Resistance = 17.99 - 21.81
Kilohms
•
20° C (68° F) Sensor Resistance = 11.37 - 13.61
Kilohms
•
25° C (77° F) Sensor Resistance = 9.12 - 10.86
Kilohms
•
30° C (86° F) Sensor Resistance = 7.37 - 8.75
Kilohms
•
40° C (104° F) Sensor Resistance = 4.90 - 5.75
Kilohms
The sensor resistance should read between these
min/max values. If the resistance values are not
OK, replace the Sensor.
3.14.8 HOMELINK UNIVERSAL
TRANSMITTER
If equipped, the HomeLink Universal Transmit-
ter is integrated into the overhead console. For
added security it will operate home security sys-
tems that use coded signals known generically as
Rolling Codes. The overhead console display pro-
vides visual feedback to the driver, indicating which
HomeLink
transmitter channel button is being
pressed. The HomeLink can learn and store up to
three separate transmitter radio frequency codes to
operate garage door openers, security gates, and
security lighting. The HomeLink
marked with one, two, or three dots. For complete
information, refer to Universal Transmitter in the
Service Manual or the Owner's Manual.
3.14.9 TIRE PRESSURE MONITORING
SYSTEM (TPM)
If equipped with the Tire Pressure Monitoring
System (TPM), each of the vehicles four wheels will
have a valve stem with a pressure sensor and radio
transmitter built in. Signals from the tire pressure
Sensor/Transmitters are received and interpreted
by the Electronic Vehicle Information Center
(EVIC).
A Sensor/Transmitter in a mounted wheel will
broadcast its detected pressure once per minute
when the vehicle is moving faster than 32 km/h (20
mph). Each Sensor/Transmitter's broadcast is
uniquely coded so that the EVIC can determine the
location.
30
buttons are
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