HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): P0AD915; Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open; 2021 - 2022 MY Corolla Corolla HV [04/2020

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001N314
Model Year Start: 2021	Model: Corolla	Prod Date Range: [04/2020 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): P0AD915; Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

DTC

P0AD915

Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open

DESCRIPTION

Refer to the description for DTC P0AE411.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0AD915

Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open

Open or short to +B in the SMRB circuit:

Primary circuit of SMR (+) is malfunctioning.

(2 trip detection logic)

Wire harness or connector
HV battery junction block assembly
Hybrid vehicle control ECU

Does not come on

Master Warning: Comes on

Related Data List

DTC No.	Data List
P0AD915	VL-Voltage before Boosting VH-Voltage after Boosting Hybrid/EV Battery Voltage SMRP Status SMRB Status SMRG Status SMRP Control Status SMRB Control Status SMRG Control Status Boosting Converter Shutdown Status Generator Inverter Shutdown Status Motor Inverter Shutdown Status

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here

Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (READY) and wait for 30 seconds or more.
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream on.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

WIRING DIAGRAM

Refer to the wiring diagram for the HV Battery High-voltage Line Circuit.

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CAUTION / NOTICE / HINT

CAUTION:

Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
- Inspecting the high-voltage system
- Disconnecting the low voltage connector of the inverter with converter assembly
- Disconnecting the low voltage connector of the HV battery

To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.

After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

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HINT:

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

*a	Without waiting for 10 minutes

NOTICE:

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.

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HINT:

If DTC P0AD915 is output, the power switch cannot be turned on (READY).

PROCEDURE

1.	READ VALUE USING TECHSTREAM (SMRB STATUS)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

Powertrain > Hybrid Control > Data List

Tester Display
SMRB Status

(d) Read the Data List.

Standard:

Tester Display	Condition	Specified Condition
SMRB Status	Power switch on (IG)	OFF

(e) Turn the power switch off.

GO TO STEP 5

2.	CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

CONNECT SECURELY

3.	CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR)

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Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK ASSEMBLY CONNECTOR)

Click here

CHECK FOR INTERMITTENT PROBLEMS

CONNECT SECURELY

5.	CHECK HARNESS AND CONNECTOR (SMRB VOLTAGE)

(a) Turn the power switch on (IG).

(b) Measure the voltage according to the value(s) in the table below.

Component with harness connected

(Hybrid Vehicle Control ECU)

Standard Voltage:

Tester Connection	Condition	Specified Condition
I2-16 (SMRB) - Body ground	Power switch on (IG)	Below 1 V

GO TO STEP 7

6.	CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

REPLACE HYBRID VEHICLE CONTROL ECU

CONNECT SECURELY

7.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)

(a) Disconnect the I2 hybrid vehicle control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I2-16 (SMRB) - Body ground	Power switch off	20.6 to 40.8 Ω

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

GO TO STEP 9

8.	CHECK HARNESS AND CONNECTOR (SHORT TO POWER SUPPLY WIRES)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery cover panel RH.

Click here

(d) Disconnect the I2 hybrid vehicle control ECU connector.

(e) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
I2-16 (SMRB) or O35-1 (SMRB) - Body ground	Power switch on (IG)	Below 1 V

NOTICE:

Turning the power switch on (IG) with the hybrid vehicle control ECU connector and the HV battery junction block assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

(to HV Battery Junction Block Assembly)

(g) Turn the power switch off.

(h) Reconnect the I2 hybrid vehicle control ECU connector.

(i) Reconnect the O35 HV battery junction block assembly connector.

(j) Install the No. 1 HV battery cover panel RH.

REPLACE HYBRID VEHICLE CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR)

Click here

Result	Proceed to
OK	A
NG (The connector is not connected securely.)	B
NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)	C

CONNECT SECURELY

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HV BATTERY JUNCTION BLOCK ASSEMBLY)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery cover panel RH.

Click here

(d) Disconnect the I2 hybrid vehicle control ECU connector.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
I2-16 (SMRB) - O35-1 (SMRB)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
I2-16 (SMRB) or O35-1 (SMRB) - Body ground and other terminals	Power switch off	10 kΩ or higher

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

(to HV Battery Junction Block Assembly)

(f) Reconnect the I2 hybrid vehicle control ECU connector.

(g) Reconnect the O35 HV battery junction block assembly connector.

(h) Install the No. 1 HV battery cover panel RH.

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	CHECK HARNESS AND CONNECTOR (HV BATTERY JUNCTION BLOCK ASSEMBLY - BODY GROUND)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery cover panel RH.

Click here

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O35-3 (GND) - Body ground	Power switch off	Below 1 Ω

*a	Front view of wire harness connector (to HV Battery Junction Block Assembly)

(e) Reconnect the O35 HV battery junction block assembly connector.

(f) Install the No. 1 HV battery cover panel RH.

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRB)

CAUTION:

Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery cover panel RH.

Click here

(d) Measure the resistance according to the value(s) in the table below.

Component without harness connected

(HV Battery Junction Block Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
O35-1 (SMRB) - O35-3 (GND)	-40 to 80°C (-40 to 176°F)	20.6 to 40.8 Ω

(e) Reconnect the O35 HV battery junction block assembly connector.

(f) Install the No. 1 HV battery cover panel RH.

CHECK FOR INTERMITTENT PROBLEMS

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY