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Home >> Lexus >> 2003 >> GX 470 >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Modulated Suspension & Rear Air Suspension System - Diagnosis >> DTC C1783/83: Door Courtesy Switch Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT DOOR COURTESY LAMP SWITCH ASSY 
    1. Check that the open door warning light comes on when each door and back door is opened and goes off when all the doors are closed.
    1. NG: CHECK DOOR COURTESY SWITCH CIRCUIT (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    2. OK: Go To Next Step 
  2. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - MULTIPLEX NETWORK BODY ECU) 
    1. Check for open and short circuit in the harness and the connector between the suspension control ECU and the multiplex network body ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: Go To Next Step 
  3. INSPECT MULTIPLEX NETWORK BODY ECU (ACTY OUTPUT) 
    1. Remove the multiplex network body ECU with connectors being connected.
    2. Measure voltage between terminal B4-20 (ACTY) and body ground of the multiplex network body ECU when door is opened and closed.
      Fig 1: Measuring Voltage Between Terminal B4-20 & Body Ground
      G03469831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      DOOR CONDITION VOLTAGE

      Door condition Voltage
      Each door opened Below 1.5 V
      All door closed 10 to 14 V
    1. NG: CHECK AND REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    2. OK: CHECK AND REPLACE SUSPENSION CONTROL ECU (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
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