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Backup Boost Converter Circuit [11/2016 - ]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK PROBLEM SYMPTOMS 
    1. Determine the trouble area by referring to the table below.
      Effect on Vehicle Trouble Area/Cause Fail-safe DTC Output Stop and start cancel indicator Symptom Proceed to
      When the engine is restarted by stop and start control:
      The following symptoms may occur
      • Audio and visual system is reset
      • The combination meter assembly fades out
      • The steering wheel feels heavy when the engine is restarted*1
      		 Backup boost converter internal malfunction
      • Internal power source malfunction
      • Internal power source overvoltage
      • CPU duty malfunction
      • Communication cycle error
      		 Stop and start control prohibited P323A00
      P323AA2
      P323B29
      P323B38      		 Blinks Systems stop operating during engine restart as the backup boost converter output voltage cannot be boosted A
      Battery voltage drop
      Systems on the converter output side do not operate
      B41 terminal: Both of the following will not operate
      • Tire pressure warning system
      • Panoramic view monitor system

      B42 terminal: Both of the following will not operate
      • Audio and visual system
      • Navigation system

      B43 terminal:
      • Rear seat entertainment system will not operate

      IG41 terminal: All of the following will not operate
      • Toyota safety sense P
      • Tire pressure warning system
      • Panoramic view monitor system
      • Blind spot monitor system
      • CAN communication system
      • EC mirror system

      EMOP terminal: The oil pump with solenoid assembly will not operate      		 Overcurrent applied to an output terminal (output terminal relay circuit is shutoff) Stop and start control is prohibited
      (Connected ECUs or sensors may detect power source malfunction DTCs)      		 P323A19 Blinks Systems do not operate as power supply from the converter is cut off A
      Systems do not operate
      (Due to converter input side malfunction)
      IG1 terminal: All of the following will not operate
      • Toyota safety sense P
      • Tire pressure warning system
      • Vehicle stability control system
      • Power steering system
      • Blind spot monitor system
      • CAN communication system
      • EC mirror system

      IG2 terminal: Both of the following will not operate
      • Safety connect system
      • Meter / gauge system

      ACC terminal: All of the following will not operate
      • Audio and visual system
      • Rear seat entertainment system
      • Navigation system
      • Panoramic view monitor system
      • Safety connect system
      		 Converter input circuit malfunction
      • Open or short to GND in IG1 circuit
      • Open or short to GND in IG2 circuit
      • Open or short to GND in ACC circuit
      		 Stop and start control prohibited - Does not blink (Blinks when communication error DTCs are stored) Systems do not operate as power supply from the converter is cut off B
      Systems on the converter output side do not operate
      (varies depending on the malfunctioning relay circuit the converter detected)
      AC41 terminal: Both of the following will not operate
      • Panoramic view monitor system
      • Safety connect system

      AC42 terminal: All of the following will not operate
      • Audio and visual system
      • Rear seat entertainment system
      • Navigation system

      IG11 terminal:
      • The power steering system will not operate

      IG12 terminal:
      • The meter / gauge system will not operate

      IG13 terminal:
      • The safety connect system will not operate

      IG31 terminal:
      • The vehicle stability control system will not operate

      IG41 terminal: All of the following will not operate
      • Toyota safety sense P
      • Tire pressure warning system
      • Panoramic view monitor system
      • Blind spot monitor system
      • CAN communication system
      • EC mirror system

      B12 terminal:
      • The safety connect system will not operate

      B41 terminal: Both of the following will not operate
      • Panoramic view monitor system
      • Tire pressure warning system

      B42 terminal: Both of the following will not operate
      • Audio and visual system
      • Navigation system

      B43 terminal:
      • The rear seat entertainment system will not operate
      		 Malfunction in circuits the converter supplies power to
      (between the converter and ECUs or sensors)
      • Open or short in the combination meter assembly circuit
      		 Related systems do not operate as the relay circuit in the converter is turned off - Does not blink (Blinks when communication error DTCs are stored) Systems do not operate as power supply from the converter is cut off B
      All of the following systems do not operate
      • Toyota safety sense P
      • Tire pressure warning system
      • Vehicle stability control system
      • Power steering system
      • Audio and visual system
      • Rear seat entertainment system
      • Navigation system
      • Panoramic view monitor system
      • Blind spot monitor system
      • Safety connect system
      • CAN communication system
      • Meter / gauge system
      • EC mirror system
      • Open in BBC fuse circuit
      • Short in converter circuit
      • Backup boost converter malfunction
      		 Stop and start control prohibited P061519 Does not blink (Due to disabled meter / gauge system) All systems that the converter supplies power to do not operate (see circuit diagram) A
      P30DF62
      P30EF48
      P323A00
      P323A16
      P323AA2
      P323B29
      P323B38
      The audio does not operate
      (until the ignition switch is turned off)      		 Excessive audio volume
      Data List item "State of BBC" displays "BBC Overcurrent" while the circuit is protected      		 The relay circuit in the converter is turned off to cut off power supply to the audio and visual system (navigation system) (Returns to normal when the ignition switch is turned off) - Does not blink If overcurrent is detected in the audio and visual system (navigation system), system operation is disabled while the ignition switch is ON
      (Returns to normal when the ignition switch is turned off)      		 C
      • The combination meter assembly cannot be turned off (short between IG12 and +B)
      • Communication error DTCs may be stored due to short between AC41 and +B
      • Communication error DTCs may be stored due to short between AC42 and +B
      HINT: Varies depending on the number of times an open occurs in the +B circuit      		 Converter circuit malfunction
      • Short between IG12 and +B
      • Short between AC41 and +B
      • Short between AC42 and +B
      		 - - Does not blink The converter cannot shut off the power source when the ignition switch is turned off B
      • Ignition switch does not turn ACC (short between ACC and +B)
      • Ignition switch does not turn off (short between IG1 or IG2 and +B)
      		 Engine stop and start ECU power source circuit malfunction
      • Short between ACC and +B
      • Short between IG1 and +B
      • Short between IG2 and +B
      		 - - Does not blink
      • Ignition switch does not turn ACC
      • Ignition switch does not turn off
      		 B
      The audio and visual system cannot be turned off (short between ACC and BIN)*2 External backup boost converter (eco run vehicle converter assembly) circuit malfunction
      • Short between ACC and BIN
      		 - - Does not blink The external backup boost converter (eco run vehicle converter assembly) cannot shut off the power source when the ignition switch is turned off D
      *1: A DTC may be stored in the power steering system
      *2: w/ Navigation System for 12 Speakers

      Result

      Proceed to
      A
      B
      C
      D

    Result:  1

    A 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2016 - ] 

    Result:  3

    C 

    See step  7

    Result:  4

    D 

    See step  10

    Result:  2

    B 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (BIN1 AND BIN2 TERMINALS POWER SOURCE CIRCUIT) 
    GTY723850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Engine Stop and Start ECU)
    1. Disconnect the engine stop and start ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A91-1 (BIN2) - Body ground Always 9.5 to 14 V
      A91-3 (BIN1) - Body ground Always 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - BATTERY) 

    Result:  1

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (IG1 AND ACC TERMINALS POWER SOURCE CIRCUIT) 
    GTY736081Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Engine Stop and Start ECU)
    1. Disconnect the engine stop and start ECU connector.
    2. Turn the ignition switch to ACC.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F123-19 (ACC) - Body ground Ignition switch ACC 9.5 to 14 V
    4. Turn the ignition switch to ON.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F123-21 (IG1) - Body ground Ignition switch ON 9.5 to 14 V
    6. Turn the ignition switch to off.
    7. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F123-19 (ACC) - Body ground Ignition switch off 0 to 1 V
      F123-21 (IG1) - Body ground Ignition switch off 0 to 1 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

    Result:  1

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (+B TERMINAL POWER SOURCE CIRCUIT) 
    GTY738778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Engine Stop and Start ECU)
    1. Disconnect the engine stop and start ECU connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A92-1 (+B) - Body ground Ignition switch ON 9.5 to 14 V
    4. Turn the ignition switch to off.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A92-1 (+B) - Body ground Ignition switch off 0 to 1 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - SEMICONDUCTOR PWR INTEGRATION ECU) 

    Result:  1

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR) 
    1. Disconnect the connector from the corresponding system ECU/sensor.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      MILLIMETER WAVE RADAR SENSOR ASSEMBLY (W/ TOYOTA SAFETY SENSE P)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - A81-8 (IGB) Always Below 1 Ω
      F123-3 (IG41) or A81-8 (IGB) - Body ground and other terminals Always 10 kΩ or higher
      FORWARD RECOGNITION CAMERA (W/ TOYOTA SAFETY SENSE P)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - S14-8 (IGB) Always Below 1 Ω
      F123-3 (IG41) or S14-8 (IGB) - Body ground and other terminals Always 10 kΩ or higher
      DRIVING SUPPORT ECU ASSEMBLY (W/ TOYOTA SAFETY SENSE P)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - F126-7 (B) Always Below 1 Ω
      F123-3 (IG41) or F126-7 (B) - Body ground and other terminals Always 10 kΩ or higher
      TIRE PRESSURE WARNING ECU AND RECEIVER (W/O SMART KEY SYSTEM)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - M25-1 (IG) Always Below 1 Ω
      F123-2 (B41) - M25-7 (+B) Always Below 1 Ω
      F123-3 (IG41) or M25-1 (IG) - Body ground and other terminals Always 10 kΩ or higher
      F123-2 (B41) or M25-7 (+B) - Body ground and other terminals Always 10 kΩ or higher
      TIRE PRESSURE WARNING ECU AND RECEIVER (W/ SMART KEY SYSTEM)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - M43-1 (IG) Always Below 1 Ω
      F123-2 (B41) - M43-7 (+B) Always Below 1 Ω
      F123-3 (IG41) or M43-1 (IG) - Body ground and other terminals Always 10 kΩ or higher
      F123-2 (B41) or M43-7 (+B) - Body ground and other terminals Always 10 kΩ or higher
      SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

      Tester Connection Condition Specified Condition
      F123-1 (IG31) - A85-12 (IG1) Always Below 1 Ω
      F123-1 (IG31) or A85-12 (IG1) - Body ground and other terminals Always 10 kΩ or higher
      STEERING SENSOR

      Tester Connection Condition Specified Condition
      F123-1 (IG31) - F58-4 (IG1) Always Below 1 Ω
      F123-1 (IG31) or F58-4 (IG1) - Body ground and other terminals Always 10 kΩ or higher
      POWER STEERING ECU ASSEMBLY

      Tester Connection Condition Specified Condition
      F123-6 (IG11) - p1-1 (IG) Always Below 1 Ω
      F123-6 (IG11) or p1-1 (IG) - Body ground and other terminals Always 10 kΩ or higher
      RADIO AND DISPLAY RECEIVER ASSEMBLY (W/ RADIO AND DISPLAY RECEIVER ASSEMBLY)

      Tester Connection Condition Specified Condition
      F123-12 (B42) - F69-4 (+B1) Always Below 1 Ω
      F123-15 (AC42) - F69-3 (ACC1) Always Below 1 Ω
      F123-12 (B42) or F69-4 (+B1) - Body ground and other terminals Always 10 kΩ or higher
      F123-15 (AC42) or F69-3 (ACC1) - Body ground and other terminals Always 10 kΩ or higher
      TELEVISION DISPLAY ASSEMBLY (W/ REAR SEAT ENTERTAINMENT SYSTEM)

      Tester Connection Condition Specified Condition
      F123-11 (B43) - S8-1 (+B) Always Below 1 Ω
      F123-15 (AC42) - S8-2 (ACC) Always Below 1 Ω
      F123-11 (B43) or S8-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
      F123-15 (AC42) or S8-2 (ACC) - Body ground and other terminals Always 10 kΩ or higher
      NAVIGATION RECEIVER ASSEMBLY (W/ NAVIGATION RECEIVER ASSEMBLY)

      Tester Connection Condition Specified Condition
      F123-12 (B42) - F114-4 (+B1) Always Below 1 Ω
      F123-15 (AC42) - F114-3 (ACC1) Always Below 1 Ω
      F123-12 (B42) or F114-4 (+B1) - Body ground and other terminals Always 10 kΩ or higher
      F123-15 (AC42) or F114-3 (ACC1) - Body ground and other terminals Always 10 kΩ or higher
      PARKING ASSIST ECU (W/ PANORAMIC VIEW MONITOR SYSTEM)

      Tester Connection Condition Specified Condition
      F123-2 (B41) - F129-2 (+B) Always Below 1 Ω
      F123-24 (AC41) - F129-1 (ACC) Always Below 1 Ω
      F123-3 (IG41) - F129-6 (IG) Always Below 1 Ω
      F123-2 (B41) or F129-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      F123-24 (AC41) or F129-1 (ACC) - Body ground and other terminals Always 10 kΩ or higher
      F123-3 (IG41) or F129-6 (IG) - Body ground and other terminals Always 10 kΩ or higher
      BLIND SPOT MONITOR SENSOR LH (W/ BLIND SPOT MONITOR SYSTEM)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - M31-5 (BLB) Always Below 1 Ω
      F123-3 (IG41) or M31-5 (BLB) - Body ground and other terminals Always 10 kΩ or higher
      BLIND SPOT MONITOR SENSOR RH (W/ BLIND SPOT MONITOR SYSTEM)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - L23-5 (BRB) Always Below 1 Ω
      F123-3 (IG41) or L23-5 (BRB) - Body ground and other terminals Always 10 kΩ or higher
      DCM (TELEMATICS TRANSCEIVER) (W/ MANUAL (SOS) SWITCH)

      Tester Connection Condition Specified Condition
      F123-16 (B12) - F35-1 (+B) Always Below 1 Ω
      F123-24 (AC41) - F35-8 (ACC) Always Below 1 Ω
      F123-26 (IG13) - F35-7 (IG2) Always Below 1 Ω
      F123-16 (B12) or F35-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
      F123-24 (AC41) or F35-8 (ACC) - Body ground and other terminals Always 10 kΩ or higher
      F123-26 (IG13) or F35-7 (IG2) - Body ground and other terminals Always 10 kΩ or higher
      CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - F135-11 (IG1) Always Below 1 Ω
      F123-3 (IG41) or F135-11 (IG1) - Body ground and other terminals Always 10 kΩ or higher
      COMBINATION METER ASSEMBLY

      Tester Connection Condition Specified Condition
      F123-10 (IG12) - F124-21 (IG+) Always Below 1 Ω
      F123-10 (IG12) or F124-21 (IG+) - Body ground and other terminals Always 10 kΩ or higher
      INNER REAR VIEW MIRROR ASSEMBLY (W/O EC MIRROR AND TOYOTA SAFETY SENSE P)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - S15-1 (IG) Always Below 1 Ω
      F123-3 (IG41) or S15-1 (IG) - Body ground and other terminals Always 10 kΩ or higher
      INNER REAR VIEW MIRROR ASSEMBLY (W/ EC MIRROR WITHOUT TOYOTA SAFETY SENSE P)

      Tester Connection Condition Specified Condition
      F123-3 (IG41) - S16-1 (IG) Always Below 1 Ω
      F123-3 (IG41) or S16-1 (IG) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  6

  6. CHECK ENGINE STOP AND START ECU (OUTPUT VOLTAGE FOR EACH SYSTEM) 
    1. Disconnect the connector from the corresponding system ECU/sensor.
    2. Measure the voltage according to the value(s) in the table below.

      HINT: 

      Measure the voltage at the corresponding terminals.

      Standard Voltage

      Tester Connection Condition Specified Condition
      M25-7 (+B) - Body ground*1 Always 10.5 to 16 V
      M43-7 (+B) - Body ground*2 Always 10.5 to 16 V
      F69-4 (+B1) - Body ground*3 Always 10.5 to 16 V
      S8-1 (+B1) - Body ground*4 Always 10.5 to 16 V
      F114-4 (+B1) - Body ground*5 Always 10.5 to 16 V
      F129-2 (+B) - Body ground*6 Always 10.5 to 16 V
      F35-1 (+B) - Body ground*7 Always 10.5 to 16 V
      • *1: w/o Smart Key System
      • *2: w/ Smart Key System
      • *3: w/ Radio and Display Receiver Assembly
      • *4: w/ Rear Seat Entertainment System
      • *5: w/ Navigation Receiver Assembly
      • *6: w/ Panoramic View Monitor System
      • *7: w/ Manual (SOS) Switch
    3. Turn the ignition switch to ACC.
    4. Measure the voltage according to the value(s) in the table below.

      HINT: 

      Measure the voltage at the corresponding terminals.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F69-3 (ACC1) - Body ground*1 Ignition switch ACC 10.5 to 16 V
      S8-2 (ACC) - Body ground*2 Ignition switch ACC 10.5 to 16 V
      F114-3 (ACC1) - Body ground*3 Ignition switch ACC 10.5 to 16 V
      F129-1 (ACC) - Body ground*4 Ignition switch ACC 10.5 to 16 V
      F35-8 (ACC) - Body ground*5 Ignition switch ACC 10.5 to 16 V
      • *1: w/ Radio and Display Receiver Assembly
      • *2: w/ Rear Seat Entertainment System
      • *3: w/ Navigation Receiver Assembly
      • *4: w/ Panoramic View Monitor System
      • *5: w/ Manual (SOS) Switch
    5. Turn the ignition switch to ON.
    6. Measure the voltage according to the value(s) in the table below.

      HINT: 

      Measure the voltage at the corresponding terminals.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A81-8 (IGB) - Body ground*1 Ignition switch ON 10.5 to 16 V
      S14-8 (IGB) - Body ground*1 Ignition switch ON 10.5 to 16 V
      F126-7 (B) - Body ground*1 Ignition switch ON 10.5 to 16 V
      M25-1 (IG) - Body ground*2 Ignition switch ON 10.5 to 16 V
      M43-1 (IG) - Body ground*3 Ignition switch ON 10.5 to 16 V
      A85-12 (IG1) - Body ground Ignition switch ON 10.5 to 16 V
      F58-4 (IG1) - Body ground Ignition switch ON 10.5 to 16 V
      p1-1 (IG) - Body ground Ignition switch ON 10.5 to 16 V
      F129-6 (IG) - Body ground*4 Ignition switch ON 10.5 to 16 V
      M31-5 (BLB) - Body ground*5 Ignition switch ON 10.5 to 16 V
      L23-5 (BRB) - Body ground*5 Ignition switch ON 10.5 to 16 V
      F35-7 (IG2) - Body ground*6 Ignition switch ON 10.5 to 16 V
      F135-11 (IG1) - Body ground Ignition switch ON 10.5 to 16 V
      F124-21 (IG+) - Body ground Ignition switch ON 10.5 to 16 V
      S15-1 (IG) - Body ground*7*8 Ignition switch ON 10.5 to 16 V
      S16-1 (IG) - Body ground*1*8 Ignition switch ON 10.5 to 16 V
      • *1: w/ Toyota Safety Sense P
      • *2: w/o Smart Key System
      • *3: w/ Smart Key System
      • *4: w/ Panoramic View Monitor System
      • *5: w/ Blind Spot Monitor System
      • *6: w/ Manual (SOS) Switch
      • *7: w/o Toyota Safety Sense P
      • *8: w/ EC Mirror

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    CHECK POWER SOURCE CIRCUIT (POWER SOURCE CIRCUIT OF RELATED SYSTEM) 

    Result:  2

    NG 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [11/2016 - ] 

  7. CHECK AUDIO AND VISUAL SYSTEM 
    1. Turn the ignition switch off and wait for 1 minute.
    2. Turn the ignition switch to ON.
    3. Lower the audio volume.
    4. Check if the audio and visual system operates normally.

      OK

      Audio and visual system operates normally.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    END 

    Result:  2

    NG 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - RADIO AND DISPLAY RECEIVER ASSEMBLY OR NAVIGATION RECEIVER ASSEMBLY) 
    1. Disconnect the engine stop and start ECU connector.
    2. Disconnect the radio and display receiver assembly connector. (w/ Radio and Display Receiver Assembly)
    3. Disconnect the navigation receiver assembly connector. (w/ Navigation Receiver Assembly)
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F123-12 (B42), F69-4 (+B1)*1 or F114-4 (+B1)*2 - Body ground Always 10 kΩ or higher
      *1: w/ Radio and Display Receiver Assembly
      *2: w/ Navigation Receiver Assembly

      Result

      Result Proceed to
      OK (w/ Radio and Display Receiver Assembly) A
      OK (w/ Navigation Receiver Assembly for 6 Speakers) B
      OK (w/ Navigation Receiver Assembly for 12 Speakers) C
      NG D

    Result:  5

    A 

    GO TO AUDIO AND VISUAL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ] 

    Result:  6

    B 

    GO TO NAVIGATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ] 

    Result:  8

    D 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  7

    C 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the external backup boost converter (eco run vehicle converter assembly) connector.
    2. Disconnect the stereo component amplifier assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A90-5 (BO1), F75-1 (+B) or F75-16 (+B2) - Body ground and other terminals Always 10 kΩ or higher
      A90-12 (ACO) or F76-12 (ACC) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  5

    OK 

    GO TO NAVIGATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (BIN TERMINAL POWER SOURCE CIRCUIT) 
    GTY730246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to External Backup Boost Converter (Eco Run Vehicle Converter Assembly))
    1. Disconnect the external backup boost converter (eco run vehicle converter assembly) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A90-11 (BIN) - Body ground Always 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - BATTERY) 

    Result:  5

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (ACC TERMINAL POWER SOURCE CIRCUIT) 
    GTY730245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to External Backup Boost Converter (Eco Run Vehicle Converter Assembly))
    1. Disconnect the external backup boost converter (eco run vehicle converter assembly) connector.
    2. Turn the ignition switch to ACC.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A90-3 (ACC) - Body ground Ignition switch ACC 9.5 to 14 V
    4. Turn the ignition switch off.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A90-3 (ACC) - Body ground Ignition switch off 0 to 1 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

    Result:  5

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - BODY GROUND) 
    1. Disconnect the external backup boost converter (eco run vehicle converter assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A90-6 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  5

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the external backup boost converter (eco run vehicle converter assembly) connector.
    2. Disconnect the stereo component amplifier assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A90-5 (BO1) - F75-1 (+B) Always Below 1 Ω
      A90-5 (BO1) - F75-16 (+B2) Always Below 1 Ω
      A90-12 (ACO) - F76-12 (ACC) Always Below 1 Ω
      A90-5 (BO1), F75-1 (+B) or F75-16 (+B2) - Body ground and other terminals Always 10 kΩ or higher
      A90-12 (ACO) or F76-12 (ACC) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  5

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY POWER SOURCE CIRCUIT) 
    1. Disconnect the stereo component amplifier assembly connectors.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F75-1 (+B) - Body ground Always 10.5 to 16 V
      F75-16 (+B2) - Body ground Always 10.5 to 16 V
    3. Turn the ignition switch to ACC.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F76-12 (ACC) - Body ground Ignition switch ACC 10.5 to 16 V

      Result

      Proceed to
      OK
      NG

    Result:  5

    OK 

    GO TO NAVIGATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ] 

    Result:  2

    NG 

    REPLACE EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY). Refer to  REMOVAL [11/2016 - ] 

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