Toyota Corolla Cross: Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open (P0AD915)

DESCRIPTION

Refer to the description for DTC P0AD911.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	Note
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	SAE Code: P0ADC

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.

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1. Connect the GTS to the DLC3.
2. Turn the ignition switch to ON and turn the GTS on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for 2 minutes or more.
5. Turn the ignition switch to ON (READY) and wait for 30 seconds or more.
6. Turn the ignition switch off and wait for 2 minutes or more.
7. Turn the ignition switch to ON and turn the GTS on.
8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
9. 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, 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:

Refer to the precautions before inspecting high voltage circuit.

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NOTICE:

• After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

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• 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.

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HINT:

If DTC P0AD915 is output, the ignition switch cannot be turned to ON (READY).

PROCEDURE

1.	READ VALUE USING GTS (SMRB STATUS)

(a) Read the Data List.

Powertrain > Hybrid Control > Data List

Tester Display
SMRB Status

Standard:

Tester Display	Condition	Specified Condition
SMRB Status	Ignition switch ON	OFF

(b) Turn the ignition switch off.

NG

GO TO STEP 5

OK

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

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NG

CONNECT SECURELY

OK

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

B

CONNECT SECURELY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

A

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

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OK

CHECK FOR INTERMITTENT PROBLEMS

NG

CONNECT SECURELY

5.	CHECK HARNESS AND CONNECTOR (SMRB VOLTAGE)

(a) Turn the ignition switch to ON.

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

*a

Component with harness connected (Hybrid Vehicle Control ECU)

-

-

Standard Voltage:

Tester Connection	Condition	Specified Condition
I249-3 (SMRB) - Body ground	Ignition switch ON	Below 1 V

(c) Turn the ignition switch off.

NG

GO TO STEP 7

OK

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

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OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

CONNECT SECURELY

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

(a) Disconnect the 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
I249-3 (SMRB) - Body ground	Ignition switch off	20.6 to 40.8 Ω

(c) Reconnect the hybrid vehicle control ECU connector.

NG

GO TO STEP 9

OK

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the HV battery junction block assembly connector.

(c) Disconnect the hybrid vehicle control ECU connector.

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I249-3 (SMRB) or O212-4 (SMRB) - Body ground	Ignition switch ON	Below 1 V

NOTICE:

Turning the ignition switch to ON 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.

(f) Turn the ignition switch off.

(g) Reconnect the hybrid vehicle control ECU connector.

(h) Reconnect the HV battery junction block assembly connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	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

B

CONNECT SECURELY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

A

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the HV battery junction block assembly connector.

(c) Disconnect the hybrid vehicle control ECU connector.

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

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
I249-3 (SMRB) - O212-4 (SMRB)	Ignition switch off	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
I249-3 (SMRB) or O212-4 (SMRB) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

(e) Reconnect the hybrid vehicle control ECU connector.

(f) Reconnect the HV battery junction block assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the HV battery junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O212-2 (GND) - Body ground	Ignition switch off	Below 1 Ω

(d) Reconnect the HV battery junction block assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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 ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the HV battery junction block assembly connector.

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

*a

Component without harness connected (HV Battery Junction Block Assembly)

-

-

Standard Resistance:

Tester Connection	Condition	Specified Condition
O212-4 (SMRB) - O212-2 (GND)	-40 to 80°C (-40 to 176°F)	20.6 to 40.8 Ω

(d) Reconnect the HV battery junction block assembly connector.

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY

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