Solar Sensor Circuit (Driver Side)

AIR CONDITIONING SYSTEM: B1424/24: Solar Sensor Circuit (Driver Side)

DTC B1424/24 - Solar Sensor Circuit (Driver Side)

DESCRIPTION





The automatic light control sensor is installed in the upper part of the instrument panel to detect the amount of solar sensor radiation with photo diode to control the heater and air conditioner "AUTO" function. It sends appropriate signals to the A/C amplifier assembly. The output voltage of the automatic light control sensor changes in accordance with the amount of solar radiation. As the amount increases, the voltage increases. As the amount decreases, the voltage decreases. The A/C amplifier assembly reads voltage output from the automatic light control sensor.





HINT: If DTC B1244 is output at the same time, troubleshoot DTC B1244 first.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and push the Techstream main switch on.
(c) Select the item below in the DATA LIST, and read the display on the Techstream.

Air Conditioner





OK:
The display is as specified in the normal condition.
Result:






C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. INSPECT MULTIPLEX NETWORK BODY ECU





(a) Remove the multiplex network body ECU with the connectors still connected.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table below.
Voltage:






OK -- CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - A/C AMPLIFIER ASSEMBLY)
NG -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MULTIPLEX NETWORK BODY ECU)





(a) Disconnect the connector from the automatic light control sensor and multiplex network body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MULTIPLEX NETWORK BODY ECU
4. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - A/C AMPLIFIER ASSEMBLY)





(a) Disconnect the connector from the A/C amplifier assembly.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT AUTOMATIC LIGHT CONTROL SENSOR





(a) Remove the automatic light control sensor.
(b) Apply battery voltage between terminals A10-6 (CLTB) and A10-3 (CLTE) of the automatic light control sensor.
(c) Measure the voltage according to the value(s) in the table below.
Voltage:





NOTE: The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect the positive (+) lead to terminal 2 and negative (-) lead to terminal 1 of the automatic light control sensor.
HINT:
- As the inspection light is moved away from the sensor, the voltage increases.
- Use an incandescent lamp for inspection. Bring it about 30 cm (11.8 in.) from the automatic light control sensor.

NG -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY