Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001QM5K
Model Year Start: 2021 Model: RAV4 Prod Date Range: [08/2020 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1800-B1803; Short in D Squib Circuit; 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]

DTC

B1800

Short in D Squib Circuit

DTC

B1801

Open in D Squib Circuit

DTC

B1802

Short in D Squib Circuit (to Ground)

DTC

B1803

Short in D Squib Circuit (to +B)

DESCRIPTION

The driver side squib circuit consists of the airbag ECU assembly, spiral with sensor cable sub-assembly and horn button assembly.

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

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B1800

Short in D Squib Circuit

One of the following conditions is met:

  • The airbag ECU assembly detects a line short circuit signal 5 times in the driver side squib circuit during the primary check.
  • A horn button assembly malfunction.
  • A spiral with sensor cable sub-assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Spiral with sensor cable sub-assembly
  • Horn button assembly
  • Airbag ECU assembly

Comes on

Applicable

B1801

Open in D Squib Circuit

One of the following conditions is met:

  • The airbag ECU assembly detects an open circuit signal in the driver side squib circuit for 2 seconds.
  • A horn button assembly malfunction.
  • A spiral with sensor cable sub-assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Spiral with sensor cable sub-assembly
  • Horn button assembly
  • Airbag ECU assembly

Comes on

Applicable

B1802

Short in D Squib Circuit (to Ground)

One of the following conditions is met:

  • The airbag ECU assembly detects a short circuit to ground signal in the driver side squib circuit for 0.5 seconds.
  • A horn button assembly malfunction.
  • A spiral with sensor cable sub-assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Spiral with sensor cable sub-assembly
  • Horn button assembly
  • Airbag ECU assembly

Comes on

Applicable

B1803

Short in D Squib Circuit (to +B)

One of the following conditions is met:

  • The airbag ECU assembly detects a short circuit to B+ signal in the driver side squib circuit for 0.5 seconds.
  • A horn button assembly malfunction.
  • A spiral with sensor cable sub-assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Spiral with sensor cable sub-assembly
  • Horn button assembly
  • Airbag ECU assembly

Comes on

Applicable

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When installing the spiral with sensor cable sub-assembly and steering wheel, be sure to adjust the spiral with sensor cable sub-assembly as it may break if the steering wheel is turned before adjusting the spiral with sensor cable sub-assembly.

    Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: INSTALLATION

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

    Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

  • 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 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

  • After replacing the airbag ECU assembly, refer to initialization.

    Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

HINT:

To perform the simulation method, enter check mode (signal check) with the Techstream (Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: CHECK MODE PROCEDURE ), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING ).

PROCEDURE

1.

CHECK CONNECTORS

(a) Turn the ignition switch off.

*1

Horn Button Assembly

*2

Airbag ECU Assembly

*3

Spiral with Sensor Cable Sub-assembly

*4

Instrument Panel Wire

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

(c) Check that the connectors are properly connected to the horn button assembly, spiral with sensor cable sub-assembly and airbag ECU assembly.

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 horn button assembly, spiral with sensor cable sub-assembly 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 spiral with sensor cable sub-assembly connector (on the horn button assembly side) is not loose, deformed or damaged.

OK:

The connector locking button is not disengaged, and the claw of the lock is not deformed or damaged.

(g) Check that the short springs of the activation prevention mechanisms of the instrument panel wire connector and spiral with sensor cable sub-assembly connector are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

NG

REPLACE INSTRUMENT PANEL WIRE OR SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY

OK

2.

CHECK HORN BUTTON ASSEMBLY

(a) Connect the instrument panel wire to the airbag ECU assembly and spiral with sensor cable sub-assembly.

*1

Horn Button Assembly

*2

Airbag ECU Assembly

*3

Spiral with Sensor Cable Sub-assembly

*4

SST

*a

Front view of wire harness connector

(to Horn Button Assembly)

*b

Color: Light Green

(b) Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (light green connector).

CAUTION:

Never connect the tester to the horn button assembly 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

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

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

(e) Clear the DTCs stored in memory.

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

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 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1800, B1801, B1802 and B1803 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 E.

DTCs B1800, B1801, B1802 and B1803 are not output

REPLACE HORN BUTTON ASSEMBLY 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: STEERING PAD: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: STEERING PAD: REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SUPPLEMENTAL RESTRAINT SYSTEMS: STEERING PAD: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: STEERING PAD: REMOVAL

DTC B1800, B1801, B1802 or B1803 is output

3.

CHECK DRIVER SIDE SQUIB CIRCUIT

(a) Disconnect the instrument panel wire from the airbag ECU assembly.

*1

Horn Button Assembly

*2

Airbag ECU Assembly

*3

Spiral with Sensor Cable Sub-assembly

*a

Front view of wire harness connector

(to Horn Button Assembly)

*b

Color: Light Green

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

z3-1 - Body ground

Ignition switch ON

Below 1 V

z3-2 - 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.

(c) Check for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z3-1 - z3-2

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

z3-1 - Body ground

Always

1 MΩ or higher

z3-2 - 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 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: SYSTEM DESCRIPTION

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z3-1 - z3-2

Always

1 MΩ or higher

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

NG

GO TO STEP 5

OK

4.

CHECK DTC

(a) Connect the connectors to the horn button assembly and airbag ECU assembly.

*1

Horn Button Assembly

*2

Airbag ECU Assembly

*3

Spiral with Sensor Cable Sub-assembly

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

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

(d) Clear the DTCs stored in memory.

Click here 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

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 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.

DTCs B1800, B1801, B1802 and B1803 are not output

USE SIMULATION METHOD TO CHECK

DTC B1800, B1801, B1802 or B1803 is output

REPLACE AIRBAG ECU ASSEMBLY 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

5.

CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the instrument panel wire from the spiral with sensor cable sub-assembly.

*1

Horn Button Assembly

*2

Airbag ECU Assembly

*3

Spiral with Sensor Cable Sub-assembly

*4

Instrument Panel Wire

*a

Front view of wire harness connector

(to Spiral with Sensor Cable Sub-assembly)

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

G21-1 (D+) - Body ground

Ignition switch ON

Below 1 V

G21-2 (D-) - 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.

(c) Check for an open in the circuit.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G21-1 (D+) - G21-2 (D-)

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

G21-1 (D+) - Body ground

Always

1 MΩ or higher

G21-2 (D-) - 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 2021 - 2024 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: SYSTEM DESCRIPTION

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G21-1 (D+) - G21-2 (D-)

Always

1 MΩ or higher

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

OK

REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: REMOVAL

NG

REPLACE INSTRUMENT PANEL WIRE