Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE OF HAND-HELD TESTER (LIGHT RHEOSTAT SIGNAL)
1. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
  METER:
  
  Fig 1: Meter - Data List
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Go to next step.
  
  Light control can be changed within the specified range by actual operation.
NG: Go to step 2

OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )
READ VALUE OF HAND-HELD TESTER (LIGHT RHEOSTAT SIGNAL)
Operate the hand-held tester according to the steps on the display and select the "DATA LIST".

BODY No.2:

Fig 2: Body No 2 - Data List
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step.

Light control can be changed within the specified range by actual operation.

NG: Go to step 5

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK-COMBINATION METER ASSY) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
1. Disconnect the C12 and D6 connectors.
2. Measure the resistance according to the value (s) in the figure Fig 3 below.
  Standard:
  
  Fig 3: Terminals Resistance Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Checking Harness And Connector (Driver Side Junction Block-Combination Meter Assy)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
REPLACE DRIVER SIDE JUNCTION BLOCK
OK: Go to next step.

Normal operation

NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )

OK: END
INSPECT LIGHT CONTROL RHEOSTAT
1. Disconnect the light control rheostat connector.
2. Measure the voltage according to the value (s) in the figure Fig 5 below.
  Standard:
  
  Fig 5: Terminals Voltage Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 6: Inspecting Light Control Rheostat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE LIGHT CONTROL RHEOSTAT

OK: Go to next step.
CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT - DRIVER SIDE JUNCTION BLOCK) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
1. Disconnect the D6 and R4 connectors.
2. Measure the resistance according to the value (s) in figure Fig 7 below.
  Standard:
  
  Fig 7: Terminals Resistance Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 8: Checking Harness And Connector (Light Control Rheostat - Driver Side Junction Block)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
REPLACE DRIVER SIDE JUNCTION BLOCK
OK: Go to next step.

Normal operation

NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL )

OK: END