Toyota Corolla Cross: Lost Communication with Battery Monitor Module Missing Message (P162B87)

DESCRIPTION

The hybrid vehicle control ECU communicates with the battery state sensor assembly via LIN communication. If a LIN communication error is detected, the hybrid vehicle control ECU stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Note
P162B87	Lost Communication with Battery Monitor Module Missing Message	Battery state sensor assembly or hybrid vehicle control ECU communication stops for approximately 17 minutes or more with the ignition switch to ON. (1 trip detection logic)	Wire harness or connector Battery state sensor assembly Hybrid vehicle control ECU Compressor with Motor Assembly	Charge warning light does not come on	SAE Code: P162B

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• Inspect the fuses for circuits related to this system before performing the following procedure.
• Before replacing the hybrid vehicle control ECU, refer to Service Bulletin.

PROCEDURE

1.	CHECK BATTERY STATE SENSOR ASSEMBLY INSTALLATION CONDITION

(a) Check installation condition of the battery state sensor assembly.

NG

INSTALL THE BATTERY STATE SENSOR ASSEMBLY CORRECTLY

OK

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Check that the battery state sensor assembly connector is securely connected.

OK:

The connector is securely connected.

(b) Disconnect the O206 battery state sensor assembly connector.

(c) Check the connector case and terminals for deformation or corrosion.

OK:

No deformation or corrosion.

(d) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Switch Condition Specified Condition O206-3 (+B) - Body ground Ignition switch off 11 to 14 V

*a Front view of wire harness connector (to Battery State Sensor Assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - BATTERY STATE SENSOR ASSEMBLY)

OK

3.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY STATE SENSOR ASSEMBLY)

(a) Disconnect the A192 hybrid vehicle control ECU connector.

(b) Disconnect the O206 battery state sensor assembly connector.

(c) Disconnect the C143 compressor with motor assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A192-16 (LIN3) - O206-2 (LIN)	Always	Below 1 Ω
A192-16 (LIN3), O206-2 (LIN) or C143-3 (DOUT) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	CLEAR DTCS

(a) Check for DTCs, and note down any DTCs that are output.

Powertrain > Hybrid Control > Trouble Codes

(b) Clear the DTCs.

Powertrain > Hybrid Control > Clear DTCs

(c) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

5.	CLEAR DTCS (AIR CONDITIONER)

(a) Check for DTCs, and note down any DTCs that are output.

Body Electrical > Air Conditioner > Trouble Codes

(b) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

(c) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

6.	CHECK FOR DTCS

(a) Turn the ignition switch to ON (READY) and wait for 17 minutes or more.

(b) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTC P162B87 is output.	A
DTCs are not output.	B

B

CHECK FOR INTERMITTENT PROBLEMS Click here Click here

A

7.	CHECK FOR DTCS (AIR CONDITIONER)

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTC B149887 is output.	A
DTCs are not output.	B

A

REPLACE HYBRID VEHICLE CONTROL ECU

B

REPLACE BATTERY STATE SENSOR ASSEMBLY

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