DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Battery / Charging System (A25A-FXS) - Diagnostic Codes & Symptom Tests) >> Charging System >> Auxiliary Battery is Discharged [11/2023 - ] >> Procedure

Auxiliary Battery is Discharged [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CUSTOMER PROBLEM ANALYSIS 
    1. Carry out customer problem analysis with the customer, and check the vehicle condition and usage conditions at the time of auxiliary battery depletion.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK AUXILIARY BATTERY 

    Refer to ON-VEHICLE INSPECTION [11/2023 - ] 

    HINT: 

    If the result of the auxiliary battery inspection is NG, charge or replace the auxiliary battery according to the inspection result, and proceed to the next step.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK DTC OUTPUT 
    1. Perform the Health Check using the GTS.
    2. Check the DTCs.

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO  DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ] 

    Result: 

    A 

    See step  4

  4. CHECK VEHICLE CONTROL HISTORY (ROB) 

    HINT: 

    Some of the control history can be checked from "Vehicle Control History (RoB)".

    1. Record the output control history.

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Vehicle Control History (RoB)

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CONFIRM VEHICLE CONTROL HISTORY (ROB) (AUXILIARY BATTERY DISCHARGE AT IG OFF) 
    1. Check that "Auxiliary Battery Discharge at IG OFF" is not output in Vehicle Control History (RoB).

      HINT: 

      A history is stored when the following conditions are met at the same time.

      • Ignition switch off and average current of auxiliary battery 120 mA or higher
      • Ignition switch off continuously for 8 hours or more

      Result

      Result Proceed to
      "Auxiliary Battery Discharge at IG OFF" is not output A
      "Auxiliary Battery Discharge at IG OFF" is output B

    Result: 

    A 

    See step  7

    Result: 

    B 

    See step  6

  6. CHECK DARK CURRENT 
    1. Turn all switches off and turn the ignition switch off.
    2. Wait for 30 minutes or more with the door lock locked.

      HINT: 

      • Once the door lock is locked, keep the electrical key transmitter sub-assembly (electrical key) 3 m (9.84 ft.) or more away from the vehicle.
      • Because the system will not sleep while any door and/or the hood is open, take steps such as securing the courtesy switch to make the system recognize the doors and hood as closed when carrying out the operation.
      • If the vehicle is equipped with a power back door, the system will not sleep if the back door is not closed. Ensure that the back door is closed before carrying out the operation.
    3. Check the dark current.
      GTY1028133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a The illustration is for reference only

      Result

      Result Proceed to
      120 mA or less A
      Higher than 120 mA B

      HINT: 

      • Close the doors and hood or make the system recognize the doors and hood as closed when checking the dark current.
      • Do not bring the electrical key transmitter sub-assembly (electrical key) near the vehicle or operate any switches when checking the dark current, as doing so will cause the system to start and increase the current.
      • Connect the electrical tester in series when checking the dark current to prevent the auxiliary battery negative (-) circuit from being disconnected.

        If the negative (-) circuit is disconnected, leave the unit for 30 minutes or more with the electrical tester connected between the negative (-) terminal of the auxiliary battery and the terminal in series, and check the dark current once the current is stable.

      • If the vehicle is equipped with a kick sensor and your foot, etc. is detected by the sensor, the current value may increase momentarily and make it impossible to properly measure the current.

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  7

  7. CONFIRM VEHICLE CONTROL HISTORY (ROB) (AUXILIARY BATTERY DISCHARGE AT RUNNING) 
    1. Check that "Auxiliary Battery Discharge at Running" is not output in Vehicle Control History (RoB).

      HINT: 

      A history is stored if one of the following conditions is met.

      • Auxiliary battery voltage while driving is 11 V or less continuously for 20 seconds or more
      • Total charge/discharge while driving is 4.5 Ah or more

      Result

      Result Proceed to
      "Auxiliary Battery Discharge at Running" is not output A
      "Auxiliary Battery Discharge at Running" is output B

    Result: 

    A 

    See step  13

    Result: 

    B 

    See step  9

  8. CHECK VEHICLE CONDITION (EXISTENCE OF OPTIONAL COMPONENTS) 
    1. Check the customer problem analysis chart and vehicle, and check whether there are any optional electrical components.

      Result

      Result Proceed to
      Optional electrical components are not installed A
      Optional electrical components are installed B

    Result: 

    A 

    See step  14

    Result: 

    B 

    See step  11

  9. CHECK DC/DC CONVERTER FUNCTION 

    Refer to PROCEDURE - Step 6

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HYBRID MOTOR CONTROL INVERTER ASSEMBLY OR HV CONVERTER (DC/DC CONVERTER) 

    Result: 

    OK 

    See step  10

  10. CHECK VEHICLE CONDITION (EXISTENCE OF OPTIONAL COMPONENTS) 
    1. Check the customer problem analysis chart and vehicle, and check whether there are any optional electrical components.

      Result

      Result Proceed to
      Optional electrical components are not installed A
      Optional electrical components are installed B

    Result: 

    A 

    See step  13

    Result: 

    B 

    See step  12

  11. CHECK DARK CURRENT (REMOVE OPTIONAL COMPONENTS) 
    1. Remove optional electrical components.
      NOTE:

      Check the installation condition of the electrical components carefully before removal.

    2. Check the dark current.

      Result

      Result Proceed to
      Decreases to 120 mA or less A
      Remains higher than 120 mA B

      HINT: 

      • Close the doors and hood or make the system recognize the doors and hood as closed when checking the dark current.
      • Do not bring the electrical key transmitter sub-assembly (electrical key) near the vehicle or operate any switches when checking the dark current, as doing so will cause the system to start and increase the current.
      • Connect the electrical tester in series when checking the dark current to prevent the auxiliary battery negative (-) circuit from being disconnected.

        If the negative (-) circuit is disconnected, leave the unit for 30 minutes or more with the electrical tester connected between the negative (-) terminal of the auxiliary battery and the terminal in series, and check the dark current once the current is stable.

      • If the vehicle is equipped with a power back door, the system will not sleep if the back door is not closed. Ensure that the back door is closed before carrying out the operation.
      • If the vehicle is equipped with a kick sensor and your foot, etc. is detected by the sensor, the current value may increase momentarily and make it impossible to properly measure the current.
    3. Install the optional electrical components.

    Result: 

    A 

    EFFECT FROM OPTIONAL COMPONENTS 

    Result: 

    B 

    See step  14

  12. CHECK CURRENT CONSUMPTION OF OPTIONAL COMPONENTS 

    Result

    Result Proceed to
    Current consumption is below 10 A A
    Current consumption is 10 A or higher B

    Result: 

    B 

    EFFECT FROM OPTIONAL COMPONENTS 

    Result: 

    A 

    See step  13

  13. CONFIRM VEHICLE CONTROL HISTORY (ROB) (AUXILIARY BATTERY VOLTAGE LOW AT IG OFF) 
    1. Check that "Auxiliary Battery Voltage Low at IG OFF" is not output in Vehicle Control History (RoB).

      HINT: 

      A history is stored when the ignition switch is off and the auxiliary battery voltage is 11.5 V or less continuously for 10 minutes or more.

      Result

      Result Proceed to
      "Auxiliary Battery Voltage Low at IG OFF" is not output A
      "Auxiliary Battery Voltage Low at IG OFF" is output B

    Result: 

    A 

    See step  17

    Result: 

    B 

    See step  16

  14. CHECK SWITCH (STUCK ON INSPECTION) 
    1. Check all the switches installed in the vehicle for systems that operate with the ignition switch off to determine whether they are stuck ON.

      HINT: 

      • Check visually, by normal operation and by pushing and/or jiggling the switches.
      • The following are examples of switches that function with the ignition switch off.
      EXAMPLES OF SWITCHES THAT FUNCTION WITH IGNITION SWITCH OFF

      Door handle switch
      Door courtesy switch
      Luggage door switch
      Pawl switch, half latch switch
      Dimmer switch
      Door lock switch
      Slide door open switch
      Luggage opener switch
      Fuel lid opener switch
      Power seat switch
      Intrusion sensor OFF switch

      Result

      Result Proceed to
      No switch malfunction A
      Switch malfunction B

    Result: 

    B 

    REPLACE MALFUNCTIONING PARTS 

    Result: 

    A 

    See step  15

  15. CHECK DARK CURRENT (NARROW DOWN MALFUNCTIONING SYSTEM) 
    1. Narrow down the malfunctioning system by checking the dark current while removing fuses starting from the one closest to the system, actuator or ECU (farthest from the power source).

      HINT: 

      • From the wiring diagram, select ECUs and components to which voltage is applied constantly via the +B voltage source, and remove those fuses 1 system at a time.
      • Fuses must be removed one at a time. Do not remove 2 or more fuses simultaneously.
      • Remove the fuses in the order that is most likely to allow the trouble area to be specified, as multiple ECUs or components may be connected to a single fuse.
      • Once a single system check is ended, proceed to the next system check without re-attaching the removed fuse(s).
      • Remove the fuses in order, and if a system with current of 120 mA or less is found, check the ECUs and/or components of that system.

      Result

      Proceed to
      NEXT

      HINT: 

      • Close the doors and hood or make the system recognize the doors and hood as closed when checking the dark current.
      • Do not bring the electrical key transmitter sub-assembly (electrical key) near the vehicle or operate any switches when checking the dark current, as doing so will cause the system to start and increase the current.
      • Connect the electrical tester in series when checking the dark current to prevent the auxiliary battery negative (-) circuit from being disconnected.

        If the negative (-) circuit is disconnected, leave the unit for 30 minutes or more with the electrical tester connected between the negative (-) terminal of the auxiliary battery and the terminal in series, and check the dark current once the current is stable.

      • If the vehicle is equipped with a power back door, the system will not sleep if the back door is not closed. Ensure that the back door is closed before carrying out the operation.
      • If the vehicle is equipped with a kick sensor and your foot, etc. is detected by the sensor, the current value may increase momentarily and make it impossible to properly measure the current.

    Result: 

    NEXT 

    CHECK AND REPAIR MALFUNCTIONING SYSTEM 

  16. READ VALUE USING GTS (TIME OF LONG TERM LEAVING WITH IG OFF (1ST, 2ND, 3RD)) 
    1. Check "Time of Long Term Leaving with IG OFF (1st, 2nd, 3rd)".

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Time of Long Term Leaving with IG OFF (1st)
      Time of Long Term Leaving with IG OFF (2nd)
      Time of Long Term Leaving with IG OFF (3rd)

      HINT: 

      A history is stored when the ignition switch is off continuously for 60 days.

      Result

      Result Proceed to
      "Time of Long Term Leaving with IG OFF (1st, 2nd, 3rd)" are all 0 days A
      Any "Time of Long Term Leaving with IG OFF (1st, 2nd, 3rd)" is 60 days or more B

    Result: 

    B 

    EFFECT FROM LONG-TERM STORAGE 

    Result: 

    A 

    See step  17

  17. CHECK CUSTOMER PROBLEM ANALYSIS RESULT 
    1. Based on the result of customer problem analysis, check the factors that may lead to auxiliary battery depletion.

      Result

      Result Proceed to
      No problems A
      Illumination, such as cabin and luggage illumination, is mistakenly left on B
      Ignition switch is left to ACC or ON (ignition switch is mistakenly left on) C
      Optional electrical components are mistakenly left on D
      The storage location of the electrical key is within 1 m (3.28 ft.) from the vehicle E
      When the customer drives for 30 minutes or less a week F

      HINT: 

      • If the storage location of the electrical key transmitter sub-assembly (electrical key) is within approximately 1 m (3.28 ft.) of the vehicle, the system may become unable to sleep, leading to auxiliary battery depletion due to repeated detection and non-detection by the vehicle exterior detection function of the key.

        If this applies, have the customer change the storage location of the electrical key transmitter sub-assembly (electrical key) to an area that is separated from the vehicle by at least 2 m (6.56 ft.).

      • If the power is mistakenly left on, the History of Reason for Operation may remain in the certification ECU (smart key ECU assembly).

    Result: 

    B 

    EFFECTS OF ILLUMINATION ETC. BEING MISTAKENLY LEFT ON 

    Result: 

    C 

    EFFECTS OF IGNITION SWITCH BEING MISTAKENLY LEFT ON 

    Result: 

    D 

    EFFECTS OF POWER BEING MISTAKENLY LEFT ON 

    Result: 

    E 

    EFFECTS OF FREQUENT ELECTRICAL KEY DETECTION 

    Result: 

    F 

    EFFECTS OF INSUFFICIENT CHARGE DUE TO LOW USAGE FREQUENCY 

    Result: 

    A 

    See step  18

  18. USE SIMULATION METHOD TO CHECK 
    1. Check that all the switches installed in the vehicle for systems that operate with the ignition switch off operate normally.

      HINT: 

      EXAMPLES OF SWITCHES THAT FUNCTION WITH IGNITION SWITCH OFF

      Switch Operation
      Door handle switch Hold and pull door handle
      Door courtesy switch Open/close door
      Luggage door switch Press switch
      Pawl switch, half latch switch Jiggle with the door and/or luggage closed (open/close operation)
      Dimmer switch Headlight flashing, headlight on/off
      Door lock switch Lock, unlock
      Slide door open switch Sliding door open/close operation
      Luggage opener switch Press switch
      Fuel lid opener switch Opening operation
      Power seat switch Power seat operation
      Intrusion sensor OFF switch Intrusion sensor on/off
    2. Operate each switch while checking the dark current, and check that the dark current drops to 120 mA or less after operation.
      NOTE:

      The electrical tester may become damaged due to an increase in dark current from switch operation. Therefore, check the dark current with the electrical tester measurement range set at maximum, and drop the measurement range gradually according to the changes in current.

      HINT: 

      After checking that the dark current drops to 120 mA or less, check the next switch.

      Result

      Result Proceed to
      Malfunction is not reproduced A
      Malfunction is reproduced B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]

    Result: 

    B 

    REPAIR OR REPLACE MALFUNCTIONING PARTS 

Diesel-Data.com