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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0AA1-231 Through U0424-537 >> DTC P0ADF-229 Hybrid Battery Negative Contactor Circuit Stuck Open; DTC P0AE0-228 Hybrid Battery Negative Contactor Circuit Stuck Closed >> Inspection Procedure

Inspection Procedure

CAUTION:
  • Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  • After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:

At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

  1. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - HV RELAY ASSEMBLY) 
    CAUTION: Be sure to wear insulated gloves.
    1. Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
      NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
    2. Disconnect the H30 connector from the HV control ECU.
    3. Disconnect the relay connector from the HV relay assembly.
    4. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

      HINT:

      If the ignition switch is turned to the ON position with the service plug grip removed, the DTC (P0AOD-350) for the interlock switch system will be output.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      CON3 (H30-1) - Body ground Below 1 V
      Fig 1: Disconnecting H30 Connector From HV Control ECU
      G05278741Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      CON3 (H30-1) - CON3 (S48-2) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      CON3 (H30-1) or CON3 (S48-2) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. INSPECT HV RELAY ASSEMBLY 
    CAUTION: Be sure to wear insulated gloves.
    1. Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
      NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
    2. Remove the HV relay assembly from the vehicle. (See REMOVAL )
    3. Measure the resistance according to the value(s) in the table below.
      Fig 2: Identifying S48 Terminals Of HV Relay Assembly Connector
      G05278742Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      S49-1 - S45-1 Below 1 Ω (Apply auxiliary battery voltage between terminals CON3 (S48-2) and GND (S48-4))
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      CON2 (S48-2) - GND (S48-4) 20 to 60 Ω at -35 to 80°C (-31 to -176°F)

    NG: REPLACE HV RELAY ASSEMBLY 

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

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