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 BUZZER (KEY REMINDER WARNING, SEAT BELT WARNING)
1. Check that the all of the warning buzzers sound.
Fig 1: Buzzers Sound Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: Go to step 2

C: Go to step 2

A: CHECK AND REPLACE COMBINATION METER ASSY
CHECK COMBINATION METER ASSY
1. Check voltage.
  1. Remove the combination meter assy with connectors still connected.
  2. Open the driver side door and ignition key still insert the ignition switch.
  3. Measure the voltage between terminal C8-15 of combination meter assy and body ground.
Standard voltage:

Fig 3: Combination Meter Assy Voltage Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: CHECK AND REPLACE COMBINATION METER ASSY

NG: Go to next step.
INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY (See ON-VEHICLE INSPECTION )
NG: REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSY

OK: Go to next step.
INSPECT UN-LOCK WARNING SWITCH ASSY (See ON-VEHICLE INSPECTION )
NG: REPLACE UN-LOCK WARNING SWITCH ASSY

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN BODY ECU AND FRONT DOOR COURTESY LAMP SWITCH)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN BODY ECU AND KEY UNLOCK WARNING SWITCH)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: CHECK AND REPLACE COMBINATION METER ASSY.
CHECK COMBINATION METER ASSY
1. Check driver seat belt warning operation.
  1. Remove the combination meter assy with connectors still connected.
  2. Ground the terminal C7-5 of combination meter assy connector.
  3. Turn the ignition switch to ON.
  4. Check that the seat belt warning light blinks.
    OK: Warning light blinks.
OK: CHECK AND REPLACE COMBINATION METER ASSY

NG: Go to next step.
INSPECT FRONT SEAT INNER BELT ASSY LH
1. Check resistance.
  1. Check resistance between terminals 1 and 4 of front seat inner belt assy LH.
    
    Fig 5: Inspecting Front Seat Inner Belt Assy LH
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard resistance:
    
    Fig 6: Front Seat Inner Belt Assy LH Resistance Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE FRONT SEAT INNER BELT ASSY LH

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN COMBINATION METER ASSY AND FRONT SEAT INNER BELT ASSY LH)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
CHECK HARNESS OR CONNECTOR (BETWEEN FRONT SEAT INNER BELT ASSY LH AND BODY GROUND)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: CHECK AND REPLACE COMBINATION METER ASSY