Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT DRIVER SIDE JUNCTION BLOCK ASSY
1. Remove driver side junction block with connector.
2. Turn light control switch AUTO.
3. Measure voltage between terminals CLTB and CLTE of driver side junction block.
  Voltage: 10 to 14V
  
  Fig 1: Measuring Voltage Between Terminals CLTB And CLTE Of Driver Side Junction Block
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE DRIVER SIDE JUNCTION BLOCK ASSY

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN BODY ECU AND SOLAR SENSOR)
1. Remove solar sensor with connectors still connected.
2. Turn the ignition switch ON.
3. Vehicle's surroundings are bright.
HINT: Connect the wire harness side connector to the sensor and inspect wire harness side connector from the back side, as shown.

Standard

Fig 2: Connecting Wire Harness Side Connector To The Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Identifying Tester Connection Specified Condition Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
INSPECT AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)
1. Connect the connector of the solar sensor.
2. Turn the ignition switch to the ON position.
3. Cover the solar sensor with a cloth.
4. Connect the tester's positive lead to terminal TSL of the solar sensor and its negative lead to terminal CLTE. Measure the voltage between terminals.
  Voltage: Below 0.8 V
  
  NOTE: Use the digital tester (electrical tester etc.) for inspection.
  
  When using analog tester, connect the positive lead to terminal CLTE and the negative lead to terminal TSL.
5. Remove the cloth from the solar sensor and shine light into the solar sensor with an inspection lamp by bringing it within 30 cm (11.8 in.) of the solar sensor.
6. Connect the tester's positive lead to terminal TSL of the solar sensor and its negative lead to terminal CLTE. Measure the voltage between terminals.
  Voltage: 4.0 to 4.6 V
NOTE: Use an incandescent lamp for inspection.

Use the digital tester (electrical tester etc.) for inspection.

When using analog tester, connect the positive lead to terminal CLTE and the negative lead to terminal TSL.

Fig 4: Connecting Tester's Positive Lead To Terminal TSL Of Solar Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE AUTOMATIC LIGHT CONTROL SENSOR

OK: Go to next step.
CHECK HARNESS AND CONNECTOR(BETWEEN SOLAR SENSOR AND HEATER CONTROL HOUSING SUB-ASSY)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY