| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM10000000277TR |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
REMOVAL
CAUTION / NOTICE / HINT
The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during battery ECU assembly removal/installation are shown below.
Necessary Procedures After Parts Removed/Installed/Replaced
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Replaced Part or Performed Procedure |
Necessary Procedure |
Effect/Inoperative Function when Necessary Procedure not Performed |
Link |
|---|---|---|---|
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Replacement of battery ECU assembly |
Current sensor offset learning |
DTCs are stored |
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CAUTION:
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Orange wire harnesses and connectors indicate high-voltage circuits. To prevent electric shock, always follow the procedure described in the repair manual.
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![2023 - 2025 MY Corolla HV [09/2022 - ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): PRECAUTION](/t3Portal/stylegraphics/info.gif)
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To prevent electric shock, wear insulated gloves when working on wire harnesses and components of the high voltage system.
NOTICE:
- The type of battery ECU assembly to be used varies depending on the vehicle model.
- If the wrong type of battery ECU assembly is installed, the power switch cannot be turned on (READY).
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After installing the battery ECU assembly, perform the following to check that the power switch can be turned on (READY).
- Turn the power switch on (READY).
- Turn the power switch off and wait for 30 seconds or more.
- Turn the power switch on (READY) again.
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This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.
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After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
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- After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
HINT:
When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.
Learning completes when vehicle is driven
|
Effect/Inoperative Function when Necessary Procedure not Performed |
Necessary Procedure |
Link |
|---|---|---|
|
Front Camera System (for TMC Made) |
Drive the vehicle straight ahead at 15 km/h (9 mph) or more for 1 second or more. |
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PROCEDURE
1. PRECAUTION
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2. WHEN REPLACING BATTERY ECU ASSEMBLY
HV battery learning values are stored in the battery ECU assembly and ECM and are used to detect malfunctions and illuminate the hybrid battery indicator light in the combination meter assembly. When either of these ECUs is replaced, the new ECU receives the HV battery learning values from the other ECU and stores them.
NOTICE:
- Do not replace the battery ECU assembly and ECM at the same time as the HV battery learning values will be lost. However, if it is necessary to replace both ECUs at the same time, replace them by following the procedure below.
- Do not replace the battery ECU assembly or ECM with a used one from another vehicle.
(a) Procedure when replacing both battery ECU assembly and ECM:
(1) Disconnect the cable from the negative (-) auxiliary battery terminal.
(2) Replace either ECU.
(3) Connect the cable to the negative (-) auxiliary battery terminal.
(4) Turn the power switch on (READY) and wait for 5 minutes or more.
(5) Turn the power switch off and disconnect the cable from the negative (-) auxiliary battery terminal.
(6) Replace the other ECU.
(7) Connect the cable to the negative (-) auxiliary battery terminal.
(8) Check that the power switch can be turned on (READY).
HINT:
If the battery ECU assembly and ECM are replaced at the same time without following the above procedure, replace either of the ECUs with its original one and then replace it again by following the above procedure. If the correct procedure is not followed, perform the procedure again from the beginning.
3. REMOVE SERVICE PLUG GRIP
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4. REMOVE CONNECTOR COVER ASSEMBLY
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5. CHECK TERMINAL VOLTAGE
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6. INSTALL CONNECTOR COVER ASSEMBLY
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7. DISCONNECT REAR SEAT CENTER LAP TYPE BELT ASSEMBLY
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8. REMOVE REAR SEAT CUSHION ASSEMBLY
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9. REMOVE REAR SEAT CUSHION LOCK HOOK
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10. REMOVE REAR DOOR SCUFF PLATE LH
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11. REMOVE REAR UNDER SIDE COVER LH
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12. REMOVE REAR DOOR SCUFF PLATE RH
HINT:
Use the same procedure as for the LH side.
13. REMOVE REAR UNDER SIDE COVER RH
HINT:
Use the same procedure as for the LH side.
14. REMOVE REAR UNDER COVER
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15. REMOVE REAR SEAT CUSHION LEG SUB-ASSEMBLY
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16. REMOVE NO. 1 HV BATTERY COVER PANEL RH
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17. REMOVE UPPER NO. 1 HYBRID BATTERY COVER SUB-ASSEMBLY
CAUTION:
Be sure to wear insulated gloves and protective goggles.
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(a) Remove the 8 bolts and upper No. 1 hybrid battery cover sub-assembly from the HV battery. |
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18. REMOVE BATTERY ECU ASSEMBLY
CAUTION:
Be sure to wear insulated gloves and protective goggles.
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(a) Disconnect the 3 battery ECU assembly connectors. NOTICE: Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector. |
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(b) Using an 8 mm socket wrench, remove the 2 bolts and battery ECU assembly from the HV battery. NOTICE: If the battery ECU assembly has been struck or dropped, replace it. |
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