Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AR8G
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): B1632,B1633; Curtain Shield Airbag Sensor Lost Communication (RH); 2019 - 2022 MY Avalon HV [04/2018 -        ]

DTC

B1632

Curtain Shield Airbag Sensor Lost Communication (RH)

DTC

B1633

Curtain Shield Airbag Sensor Initialization Error (RH)

DESCRIPTION

The side collision sensor RH circuit (bus 1) consists of the airbag ECU assembly, side airbag pressure sensor RH and side No. 2 airbag sensor RH.

The side airbag pressure sensor RH and side No. 2 airbag sensor RH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the side collision sensor RH circuit (bus 1).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B1632

Curtain Shield Airbag Sensor Lost Communication (RH)
  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor RH circuit (bus 1).
  • Side airbag pressure sensor RH malfunction
  • Side No. 2 airbag sensor RH malfunction
  • Airbag ECU assembly malfunction
  • Floor wire
  • Front door wire RH
  • Side airbag pressure sensor RH
  • Side No. 2 airbag sensor RH
  • Airbag ECU assembly

Comes on

Does not apply to test/check mode

B1633

Curtain Shield Airbag Sensor Initialization Error (RH)
  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor RH circuit (bus 1).
  • Side airbag pressure sensor RH malfunction
  • Side No. 2 airbag sensor RH malfunction
  • Airbag ECU assembly malfunction
  • Floor wire
  • Front door wire RH
  • Side airbag pressure sensor RH
  • Side No. 2 airbag sensor RH
  • Airbag ECU assembly

Comes on

Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

PROCEDURE

1.

CHECK CONNECTION OF CONNECTORS

(a) Turn the power switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the airbag ECU assembly, side airbag pressure sensor RH and side No. 2 airbag sensor RH. Also check that the connectors that link the floor wire and front door wire RH are properly connected.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

2.

CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly, side airbag pressure sensor RH and side No. 2 airbag sensor RH. Also disconnect the connectors that link the floor wire and front door wire RH.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE FLOOR WIRE OR FRONT DOOR WIRE RH
OK

3.

CHECK FLOOR WIRE

(a) Connect the cable to the negative (-) auxiliary battery terminal.

*1

Side No. 2 Airbag Sensor RH

*2

Airbag ECU Assembly

*3

Floor Wire

*4

Service Wire

*a

Front view of wire harness connector

(to Airbag ECU Assembly)

*b

Front view of wire harness connector

(to Side No. 2 Airbag Sensor RH)

(b) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K30-4 (BCR+) - Body ground

Power switch on (IG)

Below 1 V

K30-3 (BCR-) - Body ground

Power switch on (IG)

Below 1 V

(d) Turn the power switch off.

(e) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(f) Using a service wire, connect terminals 25 (BBR+) and 26 (BBR-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K30-4 (BCR+) - K30-3 (BCR-)

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

K30-4 (BCR+) - K30-3 (BCR-)

Always

1 MΩ or higher

K30-4 (BCR+) - Body ground

Always

1 MΩ or higher

K30-3 (BCR-) - Body ground

Always

1 MΩ or higher
NG

REPLACE FLOOR WIRE
OK

4.

CHECK WIRE HARNESS

(a) Connect the connectors that link the floor wire and front door wire RH.

*1

Side Airbag Pressure Sensor RH

*2

Side No. 2 Airbag Sensor RH

*3

Front Door Wire RH

*4

Floor Wire

*5

Service Wire

*a

Front view of wire harness connector

(to Side No. 2 Airbag Sensor RH)

*b

Front view of wire harness connector

(to Side Airbag Pressure Sensor RH)

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(c) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K30-1 (BDR+) - Body ground

Power switch on (IG)

Below 1 V

K30-2 (BDR-) - Body ground

Power switch on (IG)

Below 1 V

(e) Turn the power switch off.

(f) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(g) Using a service wire, connect terminals 2 (BDR+) and 1 (BDR-) of connector E.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K30-1 (BDR+) - K30-2 (BDR-)

Always

Below 1 Ω

(i) Disconnect the service wire from connector E.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K30-1 (BDR+) - K30-2 (BDR-)

Always

1 MΩ or higher

K30-1 (BDR+) - Body ground

Always

1 MΩ or higher

K30-2 (BDR-) - Body ground

Always

1 MΩ or higher
NG

GO TO STEP 7

OK

5.

CHECK SIDE NO. 2 AIRBAG SENSOR RH

(a) Connect the connectors to the side airbag pressure sensor RH and airbag ECU assembly.

*1

Side No. 2 Airbag Sensor LH

*2

Airbag ECU Assembly

(b) Interchange the side No. 2 airbag sensor RH with LH and connect the connectors.

(c) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Turn the power switch on (IG), and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the power switch off.

(g) Turn the power switch on (IG), and wait for at least 60 seconds.

(h) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1632, B1633, B1637 and B1638 may be output at this time, but they are not related to this check.

Result

Proceed to

DTC B1632 or B1633 is output.

A

DTC B1637 or B1638 is output.

B

DTCs B1632, B1633, B1637 and B1638 are not output.

C

(i) Turn the power switch off.

(j) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(k) Return the side No. 2 airbag sensor RH and LH to their original positions and connect the connectors.

B

REPLACE SIDE NO. 2 AIRBAG SENSOR RH 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: REAR AIRBAG SENSOR: REMOVAL 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: REAR AIRBAG SENSOR: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: REAR AIRBAG SENSOR: REMOVAL

C

USE SIMULATION METHOD TO CHECK

A

6.

CHECK SIDE AIRBAG PRESSURE SENSOR RH

(a) Interchange the side airbag pressure sensor RH with LH and connect the connectors.

*1

Side Airbag Pressure Sensor LH

*2

Side No. 2 Airbag Sensor RH

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(c) Turn the power switch on (IG), and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the power switch off.

(f) Turn the power switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1632, B1633, B1637 and B1638 may be output at this time, but they are not related to this check.

Result

Proceed to

DTC B1632 or B1633 is output.

A

DTC B1637 or B1638 is output.

B

DTCs B1632, B1633, B1637 and B1638 are not output.

C

(h) Turn the power switch off.

(i) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(j) Return the side airbag pressure sensor RH and LH to their original positions and connect the connectors.

A

REPLACE AIRBAG ECU ASSEMBLY 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

B

REPLACE SIDE AIRBAG PRESSURE SENSOR RH 2019 - 2020 MY Avalon Avalon HV [04/2018 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SIDE AIRBAG SENSOR (for Front Door): REMOVAL

C

USE SIMULATION METHOD TO CHECK

7.

CHECK FLOOR WIRE

(a) Disconnect the floor wire connector from the front door wire RH.

*1

Side Airbag Pressure Sensor RH

*2

Side No. 2 Airbag Sensor RH

*3

Front Door Wire RH

*4

Floor Wire

*5

Service Wire

*a

Front view of wire harness connector

(to Side No. 2 Airbag Sensor RH)

*b

Front view of wire harness connector

(to Front Door Wire RH)

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(c) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

IK1-23 (BDR+) - Body ground

Power switch on (IG)

Below 1 V

IK1-41 (BDR-) - Body ground

Power switch on (IG)

Below 1 V

(e) Turn the power switch off.

(f) Disconnect the cable from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(g) Using a service wire, connect terminals 1 (BDR+) and 2 (BDR-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

IK1-23 (BDR+) - IK1-41 (BDR-)

Always

Below 1 Ω

(i) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

IK1-23 (BDR+) - IK1-41 (BDR-)

Always

1 MΩ or higher

IK1-23 (BDR+) - Body ground

Always

1 MΩ or higher

IK1-41 (BDR-) - Body ground

Always

1 MΩ or higher
OK

REPLACE FRONT DOOR WIRE RH
NG

REPLACE FLOOR WIRE