Inspection Procedure

HINT:

In case of using the LEXUS hand-held tester, start the inspection step 1 and in case of not using the LEXUS hand-held tester, start from step  2.

1. Check solar sensor using LEXUS hand-held tester. 

   PREPARATION: 

   Connect the LEXUS hand-held tester to the DLC3.

   CHECK: 

   Check the solar sensor using DATA LIST.

   1. OK: Check and replace A/C amplifier. 
   2. NG: Go to next step. 
2. Check voltage between terminals S5 and TS of A/C amplifier connector. 

   PREPARATION: 

   Remove A/C amplifier with connectors still connected.

   CHECK: 

   1. Turn ignition switch to ON.
   2. Measure voltage between terminals S5 and TS of A/C amplifier connector when the solar sensor is subjected to an electric light, and when the sensor is covered by a cloth.

   OK: 

   VOLTAGE SPECIFICATION
   
   

   Condition	Voltage
   Sensor subjected to electric light	0.8 - 4.3 V
   Sensor covered by a cloth	Below 0.8 V

   Fig 1: Measuring Voltage Between Terminals S5 And TS Of A/C Amplifier Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   As the inspection light is moved away from the sensor, the voltage increases.

   1. NG: Go to step 3. 
   2. OK: Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). However, if DTC B1421 is displayed, check and replace A/C amplifier. 
3. Check solar sensor. 

   PREPARATION: 

   Remove solar sensor (See SOLAR SENSOR ).

   CHECK: 

   1. Cover the sensor with a cloth.
   2. Measure resistance between terminals 1 and 2 of solar sensor connector.

   HINT:

   Connect positive (+) lead of ohmmeter to terminal 2 and negative (-) lead to terminal 1 of the solar sensor.

   OK: 

   Resistance: Ω <=> (no continuity) 

   PREPARATION: 

   1. Remove the cloth from the solar sensor and subject the sensor to electric light.
   2. Measure resistance.

   OK: 

   Resistance: Approx. 10 kΩ (continuity) 

   Fig 2: Checking Solar Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   As the electric light is moved away from the sensor, the resistance increases.

   1. NG: Replace solar sensor. 
   2. OK: Go to next step. 
4. Check harness and connector between A/C amplifier and solar sensor (INSPECTION, Connectors, Terminal pins, Wiring Harness (Open or Short Circuits)). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Check and replace A/C amplifier.