Toyota Yaris: Charging System / Lost Communication with Battery Monitor Module Missing Message (P162B87)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Power Source & Network / G16e-gts (battery / Charging) / Charging System / Lost Communication with Battery Monitor Module Missing Message (P162B87)

DESCRIPTION

The ECM and battery state sensor assembly each detect reception malfunctions. A battery state sensor assembly reception malfunction detected by the battery state sensor assembly is sent to the ECM via LIN communication. If there is a malfunction in either the ECM or battery state sensor assembly, the ECM determines that there is a LIN communication malfunction and outputs a DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P162B87

Lost Communication with Battery Monitor Module Missing Message

Battery state sensor assembly or ECM communication stops for approximately 17 minutes or more with the ignition switch to ON

(1 trip detection logic)
  • Battery state sensor assembly
  • ECM
  • Wire harness or connector

Does not come on

SAE Code: P162B

WIRING DIAGRAM

Refer to the wiring diagram for the P062049.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Before replacing the ECM, refer to Service Bulletin.

PROCEDURE

1.

CHECK BATTERY STATE SENSOR ASSEMBLY INSTALLATION CONDITION

HINT:

Click here

NG

INSTALL BATTERY STATE SENSOR ASSEMBLY CORRECTLY

OK

2.

CHECK CHARGING SYSTEM

HINT:

Click here

NG

REPAIR OR REPLACE CHARGING SYSTEM
OK

3.

CHECK HARNESS AND CONNECTOR (ECM - BATTERY STATE SENSOR ASSEMBLY)

(a) Disconnect the D104 ECM connector.

(b) Disconnect the O68 battery state sensor assembly connector.

(c) Disconnect the D53 generator assembly connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

D104-62 (LIN) - O68-2 (LIN)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

D104-62 (LIN), D53-2 (LIN) or O68-2 (LIN) - Body ground

Ignition switch off

(while LIN communication stopped)

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

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 O68 battery state sensor assembly connector.

*a

Front view of wire harness connector

(to Battery State Sensor Assembly)

(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

Condition

Specified Condition

O68-3 (+B) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CLEAR DTC

(a) Check for DTCs using the GTS, and then write them down.

Powertrain > Engine > Trouble Codes

(b) Clear the DTCs.

Powertrain > Engine > Clear DTCs
NEXT

6.

READ OUTPUT DTC

(a) Start the engine and wait 17 minutes or more.

(b) Using the GTS, read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

Only P162B87 is output

A

P161A87 and P162B87 are output

B

DTCs are not output

C
A

REPLACE BATTERY STATE SENSOR ASSEMBLY

B

REPLACE ECM

C

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