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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Engine Control System - Diagnostic Codes (07 Of 10)) >> SFI SYSTEM (for Gasoline Model) >> DTC P0615-12: Starter Relay Circuit Short to Battery [10/2022 - ] >> Procedure

DTC P0615-12: Starter Relay Circuit Short to Battery [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING GTS (STARTER SW) 
    1. According to the display on the GTS, read the Data List.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW

      Standard

      Condition Starter SW
      Ignition switch ON OFF

      Result

      Result Proceed to
      The value of Starter SW is OFF A
      None of the above conditions are met B

      HINT: 

      • If the result of either of the above is not as specified, proceed to the next step with the ignition switch to ON, GTS connected and Data List item "Starter SW" selected.
      • If the starter assembly operates continuously when the ignition switch is turned to ON, proceed to the next step without reading the Data List item "Starter SW".

    Result: 

    B 

    See step  3

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (STARTER SW) 
    1. According to the display on the GTS, read the Data List while the vehicle is being driven with an engine speed of 1000 rpm or more at a vehicle speed of 20 km/h (12.43 mph) or more.

      Powertrain > Engine > Data List 

      Tester Display
      Vehicle Speed
      Engine Speed
      Starter SW
      WARNING:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Standard

      Condition Starter SW
      Driving at 20 km/h (12.43 mph) or more (engine speed 1000 rpm or more) OFF

      HINT: 

      If the result of either of the above is not as specified, proceed to the next step with the ignition switch to ON, GTS connected and Data List item "Starter SW" selected.

      Result

      Proceed to
      OK
      NG

      HINT: 

      If the starter assembly operates continuously when the ignition switch is turned to ON, proceed to the next step without reading the Data List item "Starter SW".

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ] 

    Result: 

    NG 

    See step  3

  3. INSPECT ST NO. 1 RELAY (CHECK FOR SHORT CIRCUIT) 

    Pre-procedure1

    • Remove the ST NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • According to the display on the GTS, read the Data List.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW

      Result

      Result Proceed to
      The Data List item "Starter SW" does not change from ON. A
      The Data List item "Starter SW" changes from ON to OFF. B

      HINT: 

      • When the result of the above inspection is "The Data List item "Starter SW" does not change from ON", the ST NO. 1 relay is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Post-procedure1

    • None.

    Result: 

    B 

    REPLACE ST NO. 1 RELAY 

    Result: 

    A 

    See step  4

  4. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST NO. 1 RELAY) 

    HINT: 

    The purpose of this step is to check for ST NO. 1 relay terminal voltage under abnormal conditions.

    Pre-procedure1

    • Remove the ST NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Turn the ignition switch to ON.
    • Measure the voltage between ST NO. 1 relay terminal 2 and body ground.
      GTY1254391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST NO. 1 Relay

      HINT: 

      • Make a note of the measured voltage as it will be necessary for the inspecting the change in voltage in the next step. As the next step should be conducted under the same conditions, keep the ignition switch ON and do not install the ST NO. 1 relay.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.
      • If any voltage was measured with the ignition switch ON, one of the following malfunctions is suspected:
        • Short to +B in the circuit of a connected ECU or the switch.
        • Short to +B in the wire harness.

      Result

      Proceed to
      NEXT

    Post-procedure1

    • None.

    Result: 

    NEXT 

    See step  5

  5. INSPECT ENGINE STOP AND START ECU (CHECK FOR SHORT CIRCUIT) 

    Pre-procedure1

    • Disconnect the engine stop and start ECU connector.
    • Measure the voltage between ST NO. 1 relay terminal 2 and body ground and compare it to the voltage measured in the previous step.

      Result

      Result Proceed to
      The voltage between ST NO. 1 relay terminal 2 and body ground does not change when the connector is disconnected. A
      The voltage between ST NO. 1 relay terminal 2 and body ground changes when the connector is disconnected. B

      HINT: 

      • If the voltage is the same before and after disconnecting the connector, the engine stop and start ECU is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Post-procedure1

    • None.

    Result: 

    B 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    A 

    See step  6

  6. INSPECT CERTIFICATION ECU (CHECK FOR SHORT CIRCUIT) 

    Pre-procedure1

    • Disconnect the certification ECU (smart key ECU assembly) connector.
    • Measure the voltage between ST NO. 1 relay terminal 2 and body ground and compare it to the voltage measured in the previous step.

      Result

      Result Proceed to
      The voltage between ST NO. 1 relay terminal 2 and body ground does not change when the connector is disconnected. A
      The voltage between ST NO. 1 relay terminal 2 and body ground changes when the connector is disconnected. B

      HINT: 

      • If the voltage is the same before and after disconnecting the connector, the certification ECU (smart key ECU assembly) is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Post-procedure1

    • None.

    Result: 

    B 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  7

  7. INSPECT ECM (CHECK FOR SHORT CIRCUIT) 

    Pre-procedure1

    • Disconnect the ECM connector.
    • Measure the voltage between ST NO. 1 relay terminal 2 and body ground and compare it to the voltage measured in the previous step.

      Result

      Result Proceed to
      The voltage between ST NO. 1 relay terminal 2 and body ground does not change when the connector is disconnected. A
      The voltage between ST NO. 1 relay terminal 2 and body ground changes when the connector is disconnected. B

      HINT: 

      • If the voltage is the same before and after disconnecting the connector, the ECM is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Post-procedure1

    • None.

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CERTIFICATION ECU - ENGINE STOP AND START ECU - ST NO. 1 RELAY) 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [10/2022 - ] 

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