DESCRIPTION
The cooler thermistor (ambient temperature sensor) is installed in the front part of the cooler condenser assembly. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the cooler thermistor (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 cooler thermistor (ambient temperature sensor) and reads voltage changes as changes in the resistance of the cooler thermistor (ambient temperature sensor).
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1412 |
An open or short in the cooler thermistor (ambient temperature sensor) circuit. |
|
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (AMBIENT TEMPERATURE SENSOR) |
(a) Use the Data List to check if the cooler thermistor (ambient temperature sensor) is functioning properly (See page ).
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Ambient Temp Sensor |
Cooler thermistor (ambient temperature sensor) / Min: -23.3°C (-9.94°F) Max: 65.95°C (150.71°F) |
Actual ambient temperature displayed |
Open in the circuit: -23.3°C (-9.94°F). Short in the circuit: 65.95°C (150.71°F). |
OK:
The display is as specified in the normal condition column.
Result
Result |
Proceed to |
---|---|
OK (When troubleshooting according to problem symptoms table) |
A |
OK (When troubleshooting according to the DTC) |
B |
NG |
C |
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
B |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
2. |
INSPECT COOLER THERMISTOR (AMBIENT TEMPERATURE SENSOR) |
(a) Remove the cooler thermistor (ambient temperature sensor) (See page ).
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1 - 2 |
10°C (50°F) |
3.00 to 3.73 kΩ |
15°C (59°F) |
2.45 to 2.88 kΩ |
|
20°C (68°F) |
1.95 to 2.30 kΩ |
|
25°C (77°F) |
1.60 to 1.80 kΩ |
|
30°C (86°F) |
1.28 to 1.47 kΩ |
|
35°C (95°F) |
1.00 to 1.22 kΩ |
|
40°C (104°F) |
0.80 to 1.00 kΩ |
|
45°C (113°F) |
0.65 to 0.85 kΩ |
|
50°C (122°F) |
0.50 to 0.70 kΩ |
|
55°C (131°F) |
0.44 to 0.60 kΩ |
|
60°C (140°F) |
0.36 to 0.50 kΩ |
*a |
Sensing Portion |
*b |
Resistance |
*c |
Allowable Range |
*d |
Temperature |
NOTICE:
HINT:
As the temperature increases, the resistance decreases (refer to the graph).
NG |
REPLACE COOLER THERMISTOR (AMBIENT TEMPERATURE SENSOR) |
|
3. |
CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER) |
(a) Disconnect the A23 sensor connector.
(b) Disconnect the F42 amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A23-1 - F42-5 (TAM) |
Always |
Below 1 Ω |
A23-2 - F42-13 (SG-2) |
||
F42-5 (TAM) - Body ground |
Always |
10 kΩ or higher |
F42-13 (SG-2) - Body ground |
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Manual (SOS) Switch Green Indicator Malfunction (B1571)
DESCRIPTION
This DTC is stored when the DCM (Telematics Transceiver) detects an open or short
in the manual (SOS) switch green indicator circuit of the manual (SOS) switch. The
manual (SOS) switch green indicator illuminates after the ignition switch is t ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT MAGNET CLUTCH ASSEMBLY
(a) Check the magnet clutch operation.
(1) Confirm that the magnet clutch hub and magnet clutch rotor lock when the
positive (+) lead of the battery is connected to terminal 3 of the magnet clutch, ...