SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for Gasoline Model): B1632,B1633; Curtain Shield Airbag Sensor Lost Communication (RH); 2019 - 2022 MY Avalon [04/2018

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001BKC1
Model Year Start: 2019	Model: Avalon	Prod Date Range: [04/2018 - ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for Gasoline Model): B1632,B1633; Curtain Shield Airbag Sensor Lost Communication (RH); 2019 - 2022 MY Avalon [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 engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click here

PROCEDURE

1.	CHECK CONNECTION OF CONNECTORS

(a) Turn the engine switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) 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.

CONNECT CONNECTORS PROPERLY

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.

REPLACE FLOOR WIRE OR FRONT DOOR WIRE RH

3.	CHECK FLOOR WIRE

(a) Connect the cable to the negative (-) 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 engine switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
K30-4 (BCR+) - Body ground	Engine switch on (IG)	Below 1 V
K30-3 (BCR-) - Body ground	Engine switch on (IG)	Below 1 V

(d) Turn the engine switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) 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

REPLACE FLOOR WIRE

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 (-) battery terminal.

(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	Engine switch on (IG)	Below 1 V
K30-2 (BDR-) - Body ground	Engine switch on (IG)	Below 1 V

(e) Turn the engine switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) 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

GO TO STEP 7

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.

(d) Turn the engine 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 engine switch off.

(g) Turn the engine 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 engine switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) 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.

REPLACE SIDE NO. 2 AIRBAG SENSOR RH

USE SIMULATION METHOD TO CHECK

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 (-) battery terminal.

(d) Clear the DTCs stored in memory.

Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the engine switch off.

(f) Turn the engine 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 engine switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) 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.

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE AIRBAG PRESSURE SENSOR RH

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 (-) battery terminal.

(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	Engine switch on (IG)	Below 1 V
IK1-41 (BDR-) - Body ground	Engine switch on (IG)	Below 1 V

(e) Turn the engine switch off.

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

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) 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

REPLACE FRONT DOOR WIRE RH

REPLACE FLOOR WIRE