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VA
AIR OUTLET TEMPERATURE SENSOR (Continued)
OPERATION
The air outlet temperature sensor monitors the
temperature of the air coming out of the heater hous-
ing unit. The sensor will change its internal resis-
tance in response to the temperatures it monitors.
The ATC control module is connected to the sensor
through a sensor ground circuit and a sensor signal
circuit. As the air temperature increases, the resis-
tance of the sensor decreases and the voltage moni-
tored by the module decreases. The module uses this
monitored voltage reading to an indication of the out-
let air temperature. The ATC control module makes
adjustments to maintain the requested interior tem-
perature by cycling both the A/C compressor and
solenoid heater valve on and off.
The air outlet temperature sensor is diagnosed by
performing the ATC Function Test using the DRBIII
scan tool. Refer to Body Diagnostic Procedures.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the heater-A/C control from the instru-
ment panel (Refer to 24 - HEATING & AIR CONDI-
TIONING/CONTROLS/A/C HEATER CONTROL -
REMOVAL).
(3) Disconnect the wire harness connector from the
air outlet temperature sensor (Fig. 10).
(4) Remove the air outlet temperature sensor from
the heater housing.
Fig. 10 Air Outlet Temperature Sensor
1 - HEATER HOUSING
2 - AIR OUTLET TEMPERATURE SENSOR
CONTROLS - FRONT 24 - 15
INSTALLATION
(1) Install the air outlet temperature sensor onto
the heater housing.
(2) Connect the wire harness connector to the air
outlet temperature sensor.
(3) Install the heater-A/C control into the instru-
ment panel (Refer to 24 - HEATING & AIR CONDI-
TIONING/CONTROLS/A/C HEATER CONTROL -
INSTALLATION).
(4) Reconnect the battery negative cable.
AMBIENT TEMPERATURE
SENSOR
DESCRIPTION
Ambient air temperature is connected to the
instrument cluster through a two-wire harness lead
and connector of the vehicle electrical system. The
instrument cluster sends out a message on the CAN
bus to the ATC control module. The ambient temper-
ature sensor is a variable resistor mounted to the
front licence plate bracket.
The
ambient
temperature
adjusted or repaired and, if faulty or damaged, it
must be replaced.
OPERATION
The ambient temperature sensor is a variable
resistor that operates on a five-volt reference signal
sent to it by the instrument cluster. The resistance in
the sensor changes as temperature changes. Based
upon the resistance in the sensor, the instrument
cluster sends the ATC control module a specific volt-
age on the temperature sensor signal circuit, which
is programmed to correspond to a specific tempera-
ture.
The ambient temperature sensor is diagnosed
using the DRBIII scan tool. Refer to Body Diagnos-
tic Procedures.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the front license plate bracket (Refer
to
23
-
BODY/EXTERIOR/LICENSE
BRACKET - REMOVAL).
(3) Remove the ambient temperature sensor from
the front fascia through the access hole in the fascia
(Fig. 11).
sensor
cannot
be
PLATE
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