Battery is Discharged [10/2022 - ]: Procedure

1. Carry out customer problem analysis with the customer, and check the vehicle condition and usage conditions at the time of battery depletion.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

Refer to ON-VEHICLE INSPECTION [10/2022 - ] 

HINT: 

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

Result

Result: 

NEXT 

See step  3

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 DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 10/2024]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ] 

Result: 

A 

See step  4

HINT: 

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

Refer to VEHICLE CONTROL HISTORY (RoB) [10/2022 - 08/2023] , or refer to VEHICLE CONTROL HISTORY (RoB) [08/2023 - 10/2024] , or refer to VEHICLE CONTROL HISTORY (RoB) [10/2024 - ]

1. Record the output control history.

   Powertrain > Engine > Utility 

   Tester Display
   Vehicle Control History (RoB)

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

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 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

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.

   Courtesy 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 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 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  15

Result: 

A 

See step  7

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.

   • Battery voltage while driving is 11 V or less continuously for 20 seconds or more
   • While driving, the auxiliary battery SOC (State of Charge) drops 10% or more.

   Result

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

Result: 

B 

See step  11

Result: 

A 

See step  8

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 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: 

B 

See step  13

Result: 

A 

See step  9

1. Based on the result of customer problem analysis, check the factors that may lead to 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 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  10

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  CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ] 

Result: 

B 

REPAIR OR REPLACE MALFUNCTIONING PARTS 

Refer to ON-VEHICLE INSPECTION [10/2022 - ]

Result

Result: 

NG 

REPAIR OR REPLACE GENERATOR ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

OK 

See step  12

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  8

Result: 

B 

See step  14

1. Check "Time of Long Term Leaving with IG OFF (1st, 2nd, 3rd)".

   HINT: 

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

   Powertrain > Engine > 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)

   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: 

A 

See step  9

Result: 

B 

EFFECT FROM LONG-TERM STORAGE 

Result

Result: 

A 

See step  8

Result: 

B 

EFFECT FROM 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  17

Result: 

B 

See step  16

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 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 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  17

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  18

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 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 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