DESCRIPTION
The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature which is used to control the air conditioning system AUTO mode. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the ambient temperature sensor changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies a voltage (5 V) to the ambient temperature sensor and reads voltage changes due to changes in the resistance of the ambient temperature sensor.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1412 |
Open or short in cooler thermistor (ambient temperature sensor) circuit |
|
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Check the value(s) by referring to the table below.
Air Conditioner
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Ambient Temp Sensor |
Ambient temperature sensor / Min: -23.30°C (-9.94°F) Max: 65.95°C (150.71°F) |
Actual ambient temperature displayed |
- |
OK:
The display is as specified in the Normal Condition column.
Result |
Proceed to |
---|---|
NG |
A |
OK (When troubleshooting according to Problem Symptoms Table) |
B |
OK (When troubleshooting according to the DTC) |
C |
B | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
C | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
2. |
INSPECT AMBIENT TEMPERATURE SENSOR |
(a) Remove the ambient temperature sensor (See page
).
(b) Inspect the ambient temperature sensor (See page
).
NG | ![]() |
REPLACE AMBIENT TEMPERATURE SENSOR |
|
3. |
CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the A13 ambient temperature sensor connector.
(b) Disconnect the A14 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A14-7 (TAM) - A13-1 (+) |
Always |
Below 1 Ω |
A14-33 (SG-1) - A13-2 (-) |
Always |
Below 1 Ω |
A14-7 (TAM) or A13-1 (+) - Body ground |
Always |
10 kΩ or higher |
A14-33 (SG-1) or A13-2 (-) - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Access doors (Access Cab models only)
The access door (rear door) can be opened using the inside handle.
Open the front door widely
Pull (from the outside) or push
(from the inside) the inside handle of the access door.
Open the access door
You can open and close the access door only when the front door is widely opened.
NOT ...
Disposal
DISPOSAL
CAUTION / NOTICE / HINT
CAUTION:
Before performing pre-disposal deployment of any SRS part, review and closely
follow all applicable environmental and hazardous material regulations. Predisposal
deployment may be considered hazardous material treatment.
PROCEDURE
1. PRECAUTION
...
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Blue OnStar Button
Red Emergency Button
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