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CONTROLS - REAR
TEMPERATURE SENSOR
DESCRIPTION
The rear A/C air temperature sensor is located in
the rear evaporator housing. The rear temperature
sensor provides an air outlet temperature signal to
the rear A/C control module through a two-wire har-
ness lead and connector.
The temperature sensor cannot be adjusted or
repaired and, if faulty or damaged, it must be
replaced.
OPERATION
The rear A/C temperature sensor is a variable
resistor that operates on a five-volt reference signal
sent to it by the rear A/C control module. The resis-
tance in the sensor changes as air temperature
changes. Based upon the resistance in the sensor, a
specific voltage on the temperature sensor signal cir-
cuit is returned to the rear control module, which is
programmed to correspond to a specific temperature.
DIAGNOSIS AND TESTING
Before testing the rear air temperature sensor, ver-
ify that the front A/C system is operating correctly by
performing the ATC Function Test using the DRBIII
scan tool. For circuit descriptions and diagrams, refer
to the appropriate wiring information. The wiring
information includes wiring diagrams, proper wire
and connector repair procedures, details of wire har-
ness routing and retention, connector pin-out infor-
mation and location views for the various wire
harness connectors, splices and grounds.
(1) Disconnect and isolate the battery negative
cable.
(2) Unplug the wire harness connector for the rear
air temperature sensor.
(3) Measure the resistance of the temperature sen-
sor. At –40° C (–40° F), the sensor resistance is 336
kilohms. At 55° C (131° F), the sensor resistance is
25 kilohms. The sensor resistance should read
between these two values.
(4) If OK, test and repair the rear air temperature
sensor wire harness circuits. If not OK, replace the
faulty air temperature sensor.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the rear dome light from the rear roof
duct panel (Fig. 11).
(3) Disconnect the dome light wire harness connec-
tor and remove the dome light from vehicle.
(4) Remove the six push-pin roof duct panel fasten-
ers and remove the duct panel from the vehicle.
Fig. 11 Rear Roof Duct Panel
1 - SCREW (5)
2 - PUSH-PIN FASTENER (6)
3 - REAR DOME LAMP
4 - ROOF DUCT PANEL
(5) Locate the air temperature sensor within the
evaporator housing and disconnect the wire harness
connector.
(6) Remove the temperature sensor retainer and
remove the sensor from the vehicle.
INSTALLATION
(1) Install the temperature sensor and retainer
into the rear evaporator housing.
(2) Connect the temperature sensor wire harness
connector.
(3) Install the rear duct panel and the six push-pin
duct panel fasteners.
(4) Connect the dome light wire harness connector
and install the dome light into the rear duct panel.
(5) Reconnect the battery negative cable.
VA
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