Toyota Corolla Cross Owners & Service Manuals

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

Toyota Corolla Cross (2022-2024) Service Manual / Power Source & Network / M20a-fks (battery / Charging) / Charging System / Lost Communication with Battery Monitor Module Missing Message (P162B87)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P162B87

Lost Communication with Battery Monitor Module Missing Message

except Mexico Models:

  • Battery state sensor assembly or ECM communication stops for approximately 60 seconds or more with the ignition switch ON

    (2 trip detection logic)

for Mexico Models:

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

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

Comes on (For Mexico Models: Does not come on)

Charge warning light: Does not come on

SAE Code: P162B

MONITOR DESCRIPTION

except Mexico Models

Related DTCs

P162B: LIN communication abnormality

Required Sensors/Components (Main)

Battery state sensor assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

60.5 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

except Mexico Models

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Ignition switch

ON

ECU supply voltage

9.5 V or higher

Starter

Off

TYPICAL MALFUNCTION THRESHOLDS

except Mexico Models

Battery sensor LIN communication abnormality

ON

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 (except Mexico Models).

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure (except Mexico Models).

    Click here

except Mexico Models:
  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for at least 30 seconds.
  3. Turn the ignition switch to ON [A].
  4. Wait 70 seconds or more.
  5. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
  6. Read the DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  7. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  8. Input the DTC: P162B87.
  9. Check the DTC judgment result.

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [A] through [B] again.
    • [A] to [B]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

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 procedure.
  • Before replacing the ECM, refer to Registration.

    Click here

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 CHARGING SYSTEM

Click here

NG

REPAIR OR REPLACE CHARGING SYSTEM
OK

3.

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

(a) Disconnect the C76 ECM connector.

(b) Disconnect the C133 battery state sensor assembly connector.

(c) Disconnect the C81 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

C133-2 (LIN) - C76-62 (LIN)

Always

Below 1 Ω

C81-2 (LIN) - C76-62 (LIN)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

C133-2 (LIN), C81-2 (LIN) or C76-62 (LIN) - Body ground

Ignition switch off

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 C133 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

Condition

Specified Condition

C133-3 (+B) - Body ground

Always

11 to 14 V

C133-1 (RBAT) - 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

(c) Turn the ignition switch off, wait 30 seconds.

NEXT

6.

CHECK DTC OUTPUT

(a) Start the engine.

(b) Allow the engine to idle for approximately 17 minutes or more.

(c) Enter the following menus.

Powertrain > Engine > Trouble Codes

Result

Proceed to

Only DTC P162B87 is output

A

DTC 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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