Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000002FL3T
Model Year Start: 2024 Model: RAV4 Prod Date Range: [10/2023 -           ]
Title: A25A-FKS (BATTERY / CHARGING): CHARGING SYSTEM: P162B87; Lost Communication with Battery Monitor Module Missing Message; 2024 MY RAV4 [10/2023 -        ]

DTC

P162B87

Lost Communication with Battery Monitor Module Missing Message

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

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

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.

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

(a) Check the charging system.

Click here 2024 MY RAV4 [10/2023 -        ]; A25A-FKS (BATTERY / CHARGING): CHARGING SYSTEM: ON-VEHICLE INSPECTION

NG

REPAIR OR REPLACE CHARGING SYSTEM

OK

3.

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

(a) Disconnect the C40 ECM connector.

(b) Disconnect the A48 battery state sensor assembly connector.

(c) Disconnect the C46 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

A48-2 (LIN) or C46-2 (LIN) - C40-62 (LIN)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A48-2 (LIN), C46-2 (LIN) or C40-62 (LIN) - Body ground

Always

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 A48 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

A48-1 (+B) - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to Battery State Sensor Assembly)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

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

Powertrain > Engine > Trouble Codes

(f) Enter the following menus: Powertrain / Engine / Trouble Codes.

(g) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

NEXT

6.

CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Trouble Codes.

(f) Check for DTCs.

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

CHECK FOR INTERMITTENT PROBLEMS