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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Hybrid Control System - Diagnostic Codes (4 Of 7)) >> HYBRID CONTROL SYSTEM (for PHEV Model) >> DTC P0ADD-15: Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open [08/2023 - ] >> Procedure

DTC P0ADD-15: Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING GTS (SMRG STATUS) 

    Pre-procedure1

    • None.
    • Read the Data List.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      SMRG Status

      Standard

      Tester Display Condition Specified Condition
      SMRG Status Ignition switch ON OFF

      Result

      Result Proceed to
      The value of SMRG Status is OFF A
      The value of SMRG Status is ON B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR) 

    HINT: 

    Refer to PROCEDURE - Step 5

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  4

  4. CHECK CONNECTOR CONNECTION CONDITION (NO. 2 TRACTION BATTERY WIRE CONNECTOR) 

    HINT: 

    Refer to PROCEDURE - Step 8

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  5

  5. CHECK CONNECTOR CONNECTION CONDITION (NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY CONNECTOR) 

    HINT: 

    Refer to PROCEDURE - Step 11

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2023 - ] 

    Result: 

    NG 

    CONNECT SECURELY 

  6. CHECK HARNESS AND CONNECTOR (SMRG VOLTAGE) 

    Pre-procedure1

    • Turn the ignition switch to ON (IG).
    • Measure the voltage according to the value(s) in the table below.
      GTY1205582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C59-27 (SMRG) - Body ground Ignition switch ON Below 1 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  7

  7. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    CONNECT SECURELY 

  8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C59-27 (SMRG) - Body ground Ignition switch off 20.6 to 40.8 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU connector.

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (SHORT TO POWER SUPPLY WIRES) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [08/2023 - ]

    • Disconnect the No. 2 traction battery device box assembly connector.
      GTY1205567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the hybrid vehicle control ECU connector.
    • Turn the ignition switch to ON (IG).
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C59-27 (SMRG) or o17-1 (SMRG) - Body ground Ignition switch ON Below 1 V V
      NOTE:

      Turning the ignition switch ON (IG) with the hybrid vehicle control ECU connector and the No. 2 traction battery device box assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Reconnect the hybrid vehicle control ECU connector.
    • Reconnect the No. 2 traction battery device box assembly connector.
    • Disconnect the SST.

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR) 

    HINT: 

    Refer to PROCEDURE - Step 5

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  11

  11. CHECK CONNECTOR CONNECTION CONDITION (NO. 2 TRACTION BATTERY WIRE CONNECTOR) 

    HINT: 

    Refer to PROCEDURE - Step 8

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [08/2023 - ]

    • Disconnect the No. 2 traction battery device box assembly connector.
      GTY1205567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the hybrid vehicle control ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      C59-27 (SMRG) - o17-1 (SMRG) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      C59-27 (SMRG) or o17-1 (SMRG) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU connector.
    • Reconnect the No. 2 traction battery device box assembly connector.
    • Disconnect the SST.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY - BODY GROUND) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON, unless instructed by the appropriate service information because this may cause a malfunction.

    • Disconnect the No. 2 traction battery device box assembly connectors.
      GTY1205567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      o17-5 (GND8) - Body ground Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the No. 2 traction battery device box assembly connectors.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. INSPECT NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY (SMRG) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    • Disconnect the No. 2 traction battery device box assembly connector.
      GTY1205567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.
      GTY1204724Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 2 Traction Battery Device Box Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      o17-1 (SMRG) - o17-5 (GND8) -40 to 80°C (-40 to 176°F) 20.6 to 40.8 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the No. 2 traction battery device box assembly connector.

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

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