Inspection Procedure

Preparation

1. Remove center cluster module control with connectors still connected.
2. Turn ignition switch ON.

   Check:  Measure voltage between terminals S5TS 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.

   Fig 1: Locating A/C Amplifier Terminals S5TS & TS

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   If OK  , see Fig 2.

   NOTE: As the inspection light is gradually moved away from the sensor, the voltage increases.
   Fig 2: Solar Senor Specifications

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG:  Go to step  2.
2. If OK  , proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE . However, if DTC 21 is displayed, check and replace A/C amplifier.

PREPARATION:  Remove solar sensor. See step 1 of INSPECTION .

Check

1. Cover the sensor by a cloth.
NOTE: Connect positive (+) lead of ohmmeter to terminal 2 and negative (-) lead to terminal 1 of the solar sensor.
Fig 3: Exposing Solar Sensor To Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: As the electric light is moved gradually away from the sensor, the resistance increases.
2. Measure resistance between terminals 1 and 2 of solar sensor connector.

   If OK  , resistance : infinity Ω (No continuity).

   PREPARATION:  Remove the cloth from the solar sensor and subject the sensor to electric light.

   Check:  Measure resistance. If OK  , resistance : Below 10 kΩ (Continuity).

1. NG:  Replace solar sensor.
2. If OK  , go to step  3.

1. NG:  Repair or replace harness or connector.
2. If OK  . check and replace A/C amplifier.