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Reverse Signal Circuit: Procedure

  1. INSPECT NAVIGATION RECEIVER ASSEMBLY 
    1. Disconnect the L42 navigation receiver assembly connector.
      Fig 1: Identifying L42 Navigation Receiver Assembly Connector
      GTY222398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      L42-5 (REV) - Body ground Power switch on (IG)
      Shift lever in R      		 11 to 14 V
      L42-5 (REV) - Body ground Power switch on (IG)
      Shift lever in any position except R      		 Below 1 V
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Navigation Receiver Assembly)

    NG → See step   3 

    OK → See step   2 

  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  3. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - INTEGRATION RELAY) 
    1. Disconnect the L42 navigation receiver assembly connector.
      Fig 2: Identifying L42 Navigation Receiver Assembly Connector
      GTY222398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 1G integration relay connector.
      Fig 3: Identifying 1G Integration Relay Connector
      GTY229901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L42-5 (REV) - 1G-4 (NAV) Always Below 1 Ω
      L42-5 (REV) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Navigation Receiver Assembly)
      *2 Front view of wire harness connector
      (to Integration Relay)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT INTEGRATION NO. 1 RELAY 
    1. Disconnect the 1G integration relay connector.
      Fig 4: Identifying 1G Integration Relay Connector
      GTY236465Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1G-13 (BKUP) - Body ground Power switch on (IG)
      Shift lever in R      		 11 to 14 V
      1G-13 (BKUP) - Body ground Power switch on (IG)
      Shift lever in any position except R      		 Below 1 V
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Integration Relay)

    NG → See step   6 

    OK → See step   5 

  5. REPLACE INTEGRATION NO. 1 RELAY. Refer to  REMOVAL 
  6. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - POWER MANAGEMENT CONTROL ECU) 
    1. Disconnect the 1G integration relay connector.
      Fig 5: Identifying 1G Integration Relay Connector
      GTY236465Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A21 power management control ECU connector.
      Fig 6: Identifying A21 Power Management Control ECU Connector
      GTY219239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1G-13 (BKUP) - A21-15 (BL) Always Below 1 Ω
      1G-13 (BKUP) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Integration Relay)
      *2 Front view of wire harness connector
      (to Power Management Control ECU)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  7. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL 
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