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.

HINT:

According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time.

Warm up the engine.
Turn the ignition switch off.
Connect the OBD II scan tool or hand-held tester to the DLC3.
Turn the ignition switch to the ON position.
Push the "ON" button of the OBD II scan tool or the hand-held tester.
When you use hand-held tester:
Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
According to the display on tester, read the "DATA LIST".

Fig 1: Identifying Measurement Item Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT STOP LAMP SWITCH ASSY
1. Remove the stop lamp switch assy.
2. Measure the resistance according to the value(s) in the figure Fig 2 below.
  Standard
  
  Fig 2: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Measuring Resistance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LAMP SWITCH ASSY

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (STOP LAMP SWITCH ASSY - ECM)
1. Install the stop lamp switch assy connector.
2. Measure the voltage according to the value(s) in the figure Fig 4 below when the brake pedal is depressed and released.
  Standard
  
  Fig 4: Identifying Tester Connection Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Measuring Voltage
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE )

OK: REPLACE ECM (SEE ECM (3MZ-FE) )