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Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular Communication >> LEXUS Link System >> DTC 4-7 EMERGENCY, VOL+ or VOL- Button has Connection Error >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (MAYDAY ECU - MAP LIGHT (MAYDAY SWITCH)) 
    1. Disconnect the R23 ECU connector.
    2. Disconnect the X4 map light connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R23-5 (SIG1) - X4-30 (SIG1) Always Below 1 Ω
      R23-12 (SIG-) - X4-32 (GND3) Always Below 1 Ω
      Fig 1: Identifying R23 ECU And X4 Map Light Connector Terminals
      G04945815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR THEN CLEAR HISTORIC DTC 

      OK: Go to Next Step 

  2. INSPECT MAP LIGHT ASSEMBLY (MAYDAY SWITCH) 
    1. Remove the map light for standard body (see REMOVAL ) or long body (see REMOVAL ).
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      30 (SIG1) - 32 (GND3) EMERGENCY button is pressed 305 to 313 Ω
      30 (SIG1) - 32 (GND3) VOL+ button is pressed 812 to 831 Ω
      30 (SIG1) - 32 (GND3) VOL- button is pressed 1811 to 1848 Ω
      Fig 2: Identifying Map Light Assembly Connector Terminals (GND3 And SIG1)
      G04945810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE MAP LIGHT ASSEMBLY (MAYDAY SWITCH) THEN CLEAR HISTORIC DTC 

      OK: REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION 

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