SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): B1825-B1828; Short in Side Squib (LH) Circuit; 2019 - 2020 MY RAV4 RAV4 HV [02/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001HIAM
Model Year Start: 2019	Model: RAV4	Prod Date Range: [02/2019 - 08/2020]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): B1825-B1828; Short in Side Squib (LH) Circuit; 2019 - 2020 MY RAV4 RAV4 HV [02/2019 - 08/2020]

DTC

B1825

Short in Side Squib (LH) Circuit

DTC

B1826

Open in Side Squib (LH) Circuit

DTC

B1827

Short in Side Squib (LH) Circuit (to Ground)

DTC

B1828

Short in Side Squib (LH) Circuit (to +B)

DESCRIPTION

The front side squib LH circuit consists of the airbag ECU assembly and front seat airbag assembly LH.

The circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the front side squib LH circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1825	Short in Side Squib (LH) Circuit	One of the following conditions is met: The airbag ECU assembly detects a line short circuit signal 5 times in the front side squib LH circuit during the primary check. A front seat airbag assembly LH malfunction. An airbag ECU assembly malfunction.	Floor wire Front seat airbag assembly LH Airbag ECU assembly	Comes on	Applicable
B1826	Open in Side Squib (LH) Circuit	One of the following conditions is met: The airbag ECU assembly detects an open circuit signal in the front side squib LH circuit for 2 seconds. A front seat airbag assembly LH malfunction. An airbag ECU assembly malfunction.	Floor wire Front seat airbag assembly LH Airbag ECU assembly	Comes on	Applicable
B1827	Short in Side Squib (LH) Circuit (to Ground)	One of the following conditions is met: The airbag ECU assembly detects a short circuit to ground signal in the front side squib LH circuit for 0.5 seconds. A front seat airbag assembly LH malfunction. An airbag ECU assembly malfunction.	Floor wire Front seat airbag assembly LH Airbag ECU assembly	Comes on	Applicable
B1828	Short in Side Squib (LH) Circuit (to +B)	One of the following conditions is met: The airbag ECU assembly detects a short circuit to B+ signal in the front side squib LH circuit for 0.5 seconds. A front seat airbag assembly LH malfunction. An airbag ECU assembly malfunction.	Floor wire Front seat airbag assembly LH Airbag ECU assembly	Comes on	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

HINT:

To perform the simulation method, enter check mode (signal check) with the Techstream (Click here ), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (Click here ).

PROCEDURE

1.	CHECK CONNECTORS

(a) Turn the ignition switch off.

*1	Front Seat Airbag Assembly LH
*2	Airbag ECU Assembly
*3	Floor Wire

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

OK:

The connectors are properly connected.

HINT:

If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the front seat airbag assembly LH and airbag ECU assembly.

(e) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

(f) Check that the short springs of the activation prevention mechanism of the floor wire connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

REPLACE FLOOR WIRE

2.	CHECK FRONT SEAT AIRBAG ASSEMBLY LH

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

*1	Front Seat Airbag Assembly LH
*2	Airbag ECU Assembly
*3	SST
*a	Front view of wire harness connector (to Front Seat Airbag Assembly LH)

(b) Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.

CAUTION:

Never connect the tester to the front seat airbag assembly LH for measurement, as this may lead to a serious injury due to airbag deployment.

NOTICE:

Do not forcibly insert SST into the terminals of the connector when connecting SST.
Insert SST straight into the terminals of the connector.

SST: 09843-18061

(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 B1825, B1826, B1827 and B1828 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) Disconnect SST from connector C.

DTCs B1825, B1826, B1827 and B1828 are not output

REPLACE FRONT SEAT AIRBAG ASSEMBLY LH

for Manual Seat:

Click here

for Power Seat:

Click here

DTC B1825, B1826, B1827 or B1828 is output

3.	CHECK FLOOR WIRE

(a) Disconnect the floor wire from the airbag ECU assembly.

*1	Front Seat Airbag Assembly LH
*2	Airbag ECU Assembly
*3	Floor Wire
*a	Front view of wire harness connector (to Front Seat Airbag Assembly LH)
	Release the activation prevention mechanism

(b) Check for a short to B+ in the circuit.

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

(2) Turn the ignition switch to ON.

(3) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
N30-1 (SFL+) - Body ground	Ignition switch ON	Below 1 V
N30-2 (SFL-) - Body ground	Ignition switch ON	Below 1 V

(4) Turn the ignition switch off.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N30-1 (SFL+) - N30-2 (SFL-)	Always	Below 1 Ω

(d) Check for a short to ground in the circuit.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N30-1 (SFL+) - Body ground	Always	1 MΩ or higher
N30-2 (SFL-) - Body ground	Always	1 MΩ or higher

(e) Check for a short in the circuit.

(1) Release the activation prevention mechanism built into connector B.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N30-1 (SFL+) - N30-2 (SFL-)	Always	1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector B to the original condition.

REPLACE FLOOR WIRE

CHECK DTC

(a) Connect the connectors to the front seat airbag assembly LH and airbag ECU assembly.

*1	Front Seat Airbag Assembly LH
*2	Airbag ECU Assembly

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

(d) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the ignition switch off.

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

(g) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

DTCs B1825, B1826, B1827 and B1828 are not output

USE SIMULATION METHOD TO CHECK

DTC B1825, B1826, B1827 or B1828 is output

REPLACE AIRBAG ECU ASSEMBLY