Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross, and 2023 Toyota Corolla Cross. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Refer to the precautions before inspecting high voltage circuit.

Refer to PRECAUTION [11/2022 - 12/2024] , or refer to PRECAUTION [12/2024 - ]

NOTE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the auxiliary negative (-) battery terminal.
Refer to BEFORE DISCONNECTING BATTERY [11/2022 - 11/2023] , or refer to BEFORE DISCONNECTING BATTERY [11/2023 - ]
When disconnecting and reconnecting the auxiliary battery.
HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Refer to AUTOMATIC LEARNING CHART [11/2022 - ]

HINT:

After repair, clear the DTCs, turn the ignition switch off and wait for 30 seconds or more and perform the following procedure to confirm that the auxiliary battery low voltage indicated by this DTC has been repaired.
1. Wait for 2 minutes with the shift lever in P, the ignition switch ON (READY) and the following conditions met, then confirm that Data List item "BATT Voltage (Hybrid control system)" is between 13.0 and 15.0 V.
  (If charging is not performed and the electrical load increases, +B voltage may not be steady and will gradually drop.)
  1. Headlight switch is in the HI position.
  2. A/C blower fan switch is in the HI position.
  3. Window defogger switch is turned on.
By performing the following procedure, the DC/DC converter function can be checked.
1. Connect the AC/DC 400 A probe to the positive (+) auxiliary battery cable.
  1. Turn the ignition switch to ON (READY) and leave the vehicle as is until the electric current flowing to the auxiliary battery becomes 10 A or less.
  2. Turn the ignition switch to ON (READY) and turn the headlight switch and A/C blower fan switch to the HI position and the window defogger on.
  3. Confirm that the current drawn from the auxiliary battery is 0 A or lower and the auxiliary battery voltage is between 13.0 and 15.0 V.

This DTC may be also stored when a part other than the DC/DC converter is malfunctioning or depending on user operation.

If this vehicle is used to jump start another vehicle with a discharged battery, a fuse may blow due to overcurrent or the DC/DC converter self-protection may be activated. Also, if this vehicle is jump started by a vehicle with a 24 V battery, the same malfunction may occur and this DTC may be stored. (The suspended DC/DC converter control will return to normal by clearing the DTCs and turning the ignition switch off.)

Check whether high electrical load equipment such as a high-capacitance audio device or electric kettle is used in the vehicle. (A fuse of the auxiliary battery may be blown due to overcurrent.)

If the DC/DC converter is malfunctioning, the auxiliary battery cannot be charged. Therefore, once the ignition switch is turned off, it may be impossible to turn it to ON (READY) again if the auxiliary battery is completely discharged. In this case, charge the auxiliary battery. Be careful as charging is not performed during the inspection.

If the ignition switch turns off immediately after it is turned to ON (READY), the auxiliary battery voltage may be low. Charge the auxiliary battery.

P19E1-00 may be output as a result of the malfunction indicated by the DTCs in table below.

The chart above is listed in inspection order of priority.

Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

TABLE 1

Malfunction Content	System	Relevant DTC
Insulation Malfunction	Hybrid control system	P1C7C-49	Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure
		P1C7D-49	Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure
		P1C7E-49	Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure
		P1C7F-49	Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure
		P1C80-49	Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure
High Voltage Circuit Malfunction	Hybrid control system	P0AA6-49	Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure
		P0AD9-11	Hybrid/EV Battery Positive Contactor Circuit Short to Ground
		P0ADD-11	Hybrid/EV Battery Negative Contactor Circuit Short to Ground
		P1C84-49	High Voltage Power Resource Circuit Short during Ready ON
		P3004-49	High Voltage Power Resource Circuit Short during Pre-Charge

TABLE 2

Malfunction Content	System	Relevant DTC
System malfunction	Hybrid control system	U01BD-87	Lost Communication with DC/DC Converter Control Module "C"
		P0A93-00	Inverter "A" Cooling System Performance
		P0C73-96	Motor Electronics Coolant Pump "A" Component Internal Failure
		P314A-31	Motor Electronics Coolant Pump "A" No Signal
	Motor generator control system	P0E57-17	DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Above Threshold