SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/o Occupant Classification System): B163B,B163C; Side Airbag Sensor Assembly No.2 Lost Communication (LH); 2019 - 2020 MY RAV4 RAV4 HV [11/2018

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001FQRL
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - 08/2020]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/o Occupant Classification System): B163B,B163C; Side Airbag Sensor Assembly No.2 Lost Communication (LH); 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]

DTC

B163B

Side Airbag Sensor Assembly No.2 Lost Communication (LH)

DTC

B163C

Side Airbag Sensor Assembly No.2 Initialization Error (LH)

DESCRIPTION

The side collision sensor LH circuit consists of the airbag ECU assembly and floor side airbag sensor LH.

The floor side airbag sensor LH detects impacts to the vehicle and sends signals to the airbag ECU assembly to determine if the SRS should be deployed.

These DTCs are stored when a malfunction is detected in the No. 2 side collision sensor LH circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B163B	Side Airbag Sensor Assembly No.2 Lost Communication (LH)	One of the following conditions is met: The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit. A floor side airbag sensor LH malfunction. An airbag ECU assembly malfunction.	Floor wire Floor side airbag sensor LH Airbag ECU assembly	Comes on	Not applicable
B163C	Side Airbag Sensor Assembly No.2 Initialization Error (LH)	One of the following conditions is met: The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit. A floor side airbag sensor LH malfunction. An airbag ECU assembly malfunction.	Floor wire Floor side airbag sensor LH Airbag ECU assembly	Comes on	Not applicable

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
Click here
When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
Click here
After replacing the airbag ECU assembly, refer to initialization.
Click here

PROCEDURE

1.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

The connectors are not properly connected

CONNECT CONNECTORS PROPERLY

The connectors are properly connected

2.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly and floor side airbag sensor LH.

(b) Check that the connectors (on the airbag ECU assembly side and floor side airbag sensor LH side) are not damaged.

*1	Floor Side Airbag Sensor LH
*2	Airbag ECU Assembly
*3	Floor Wire

The connectors are deformed or damaged

REPLACE FLOOR WIRE

The connectors are not deformed or damaged

3.	CHECK FLOOR WIRE

(a) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

*1	Floor Side Airbag Sensor LH
*2	Airbag ECU Assembly
*3	Floor Wire
*4	Service Wire
*a	Front view of wire harness connector (to Floor Side Airbag Sensor LH)
*b	Front view of wire harness connector (to Airbag ECU Assembly)

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
N23-2 (BFL+) - Body ground	Ignition switch ON	Below 1 V
N23-1 (BFL-) - Body ground	Ignition switch ON	Below 1 V

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(f) Using a service wire, connect terminals 29 (BCL+) and 30 (BCL-) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N23-2 (BFL+) - N23-1 (BFL-)	Always	Below 1 Ω

(h) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N23-2 (BFL+) - N23-1 (BFL-)	Always	1 MΩ or higher
N23-2 (BFL+) - Body ground	Always	1 MΩ or higher
N23-1 (BFL-) - Body ground	Always	1 MΩ or higher

REPLACE FLOOR WIRE

4.	CHECK FLOOR SIDE AIRBAG SENSOR LH

(a) Connect the connectors to the airbag ECU assembly.

(b) Interchange the floor side airbag sensor LH with RH and connect the connectors to them.

*1	Floor Side Airbag Sensor RH
*2	Airbag ECU Assembly

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the ignition switch off.

(g) Turn the ignition switch to ON, and wait for at least 60 seconds.

(h) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B162B, B162C, B163B and B163C may be output at this time, but they are not related to this check.

(i) Turn the ignition switch off.

(j) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(k) Return the floor side airbag sensor RH and LH to their original positions and connect the connectors to them.

DTC B163B or B163C is output

REPLACE AIRBAG ECU ASSEMBLY

DTC B162B or B162C is output

REPLACE FLOOR SIDE AIRBAG SENSOR LH

DTCs B162B, B162C, B163B and B163C are not output

USE SIMULATION METHOD TO CHECK