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.

CHECK LIGHT
1. Check that headlamp and taillight light up.
  NG: FLOW CHART (GO TO FLOW CHART OF HEADLAMP OR TAILLIGHT)
  
  OK: Go to Next Step
READ VALUE OF HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main SW ON.
3. Select the item "AUTO LIGHT SW" in the DATA LIST and read its value displayed on the hand-held tester.
  OK:
  - Light control SW AUTO --> ON
  - Light control SW except AUTO --> OFF
  NG: REPLACE HEADLAMP DIMMER SWITCH ASSY
  
  OK: Go to Next Step
CHECK AUTOMATIC LIGHT CONTROL SENSOR
1. Check the continuity between terminal 3(+) and body ground as shown in Fig 2 .
  
  Fig 1: Checking Continuity Between Terminal 3 & Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure voltage between terminals as shown in Fig 2 .
3. Using an oscilloscope, check that signal waveform appears between terminals.
  Standard:
  
  Fig 2: Automatic Light Control Sensor Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: FLOW CHART (GO TO FLOW CHART OF HEADLAMP OR TAILLIGHT)
  
  NG: Go to Next Step
CHECK HARNESS AND CONNECTOR (BETWEEN DRIVER SIDE J/B ASSY AND AUTOMATIC LIGHT CONTROL SENSOR)
1. Check that signal waveform appears between terminal B5 - 17 (CLTS) and body ground.
  Standard: Bar appears.
  
  OK: CHECK AND REPLACE DRIVER SIDE JUNCTION BLOCK ASSY
  
  NG: Go to Next Step
CHECK HARNESS AND CONNECTOR (BETWEEN DRIVER SIDE J/B ASSY AND AUTOMATIC LIGHT CONTROL SENSOR)
1. Measure voltage between terminal B5-15 (CLTB) and body ground.
  Standard: 10 - 14V
  
  OK: CHECK AND REPLACE DRIVER SIDE JUNCTION BLOCK ASSY
  
  NG: Go to Next Step
CHECK HARNESS AND CONNECTOR (BETWEEN DRIVER SIDE J/B ASSY AND AUTOMATIC LIGHT CONTROL SENSOR)
1. Check the continuity between terminal B5 - 16 (CLTE) of driver side J/B assy and 3 (CLTE) of automatic light control sensor.
  Standard: There is continuity.
  
  OK: CHECK AND REPLACE DRIVER SIDE JUNCTION BLOCK ASSY
  
  NG: REPLACE AUTOMATIC LIGHT CONTROL SENSOR