Inspection Procedure

CHECK ILLUMINATION
1. Operate the rheostat and check that the quantity of light for the combination meter assy, audio system and A/C control panel etc. are normally changed.
  
  Fig 1: Illumination Check Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. B: Go to step 5 .
2. A: GO TO NEXT STEP.
CHECK DATA LIST
1. Check the date list of body ECU.
1. OK: NORMAL
2. NG: GO TO NEXT STEP.
INSPECT LIGHT CONTROL RHEOSTAT
1. Check the continuity of light control rheostat when li control rheostat operation as shown in chart below.
  Standard:
  
  Fig 2: Rheostat Continuity Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE LIGHT CONTROL RHEOSTAT
2. OK: GO TO NEXT STEP.
  
  Fig 3: Identifying Light Control Rheostat Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK HARNESS AND CONNECTOR
1. Check the continuity between terminals 8 (TC) of light control rheostat and B5-18 of combination meter connector.
  Standard: There is continuity.
2. Check the continuity between terminals C9-16 of combination meter assy and B5-5 of body ECU.
  Standard: There is continuity.
1. OK: REPLACE COMBINATION METER ASSY
2. NG: GO TO NEXT STEP.
  REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT LIGHT CONTROL RHEOSTAT
1. Check the continuity of light control rheostat when light control rheostat operation as shown in chart below.
  Standard:
  
  Fig 4: Rheostat Continuity Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 5: Identifying Light Control Rheostat Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE LIGHT CONTROL RHEOSTAT
2. OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (BETWEEN LIGHT CONTROL THERMOSTAT AND INSTRUMENT PANEL JUNCTION)
1. Check the continuity between 1 (T) of light control rheostat and R12-21 of instrument panel junction block assy.
  
  Fig 6: Checking Harness And Connector (Between Light Control Rheostat And Instrument Panel Junction)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard: There is continuity.
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY
1. Measure voltage between terminal R12-21 of instrument panel junction block assy and body ground.
  Standard:
  
  Fig 7: Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: REPLACE COMBINATION METER ASSY
2. NG: GO TO NEXT STEP.
  REPAIR OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY