SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): B1633; Curtain Shield Airbag Sensor Initialization Error (RH); 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001G4PK
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): B1633; Curtain Shield Airbag Sensor Initialization Error (RH); 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

B1633

Curtain Shield Airbag Sensor Initialization Error (RH)

DESCRIPTION

The side collision sensor RH circuit (bus 1) consists of the airbag sensor 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 sensor assembly to determine if the airbags and pretensioners should be deployed.

DTC B1633 is 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
B1633	Curtain Shield Airbag Sensor Initialization Error (RH)	The airbag sensor assembly detects a line short, short to ground or B+, or an open in the side collision sensor RH circuit (bus 1). Side No. 2 airbag sensor RH malfunction Airbag sensor assembly malfunction	Floor wire Front door wire RH Side No. 2 airbag sensor RH Airbag sensor 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

PROCEDURE

1.	CHECK HISTORY DTC

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

(b) Check for history DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than history DTC B1632 may be output at this time, but they are not related to this check.

Result	Proceed to
History DTC B1632 is not output.	A
History DTC B1632 is output.	B

GO TO DTC B1632

2.	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 sensor 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

3.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor 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

4.	CHECK FLOOR WIRE

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

*1	Side No. 2 Airbag Sensor RH
*2	Airbag Sensor Assembly
*3	Floor Wire
*4	Service Wire
*a	Front view of wire harness connector (to Airbag Sensor Assembly)
*b	Front view of wire harness connector (to Side No. 2 Airbag Sensor RH)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
O10-4 (BCR+) - Body ground	Power switch on (IG)	Below 1 V
O10-3 (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
O10-4 (BCR+) - O10-3 (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
O10-4 (BCR+) - O10-3 (BCR-)	Always	1 MΩ or higher
O10-4 (BCR+) - Body ground	Always	1 MΩ or higher
O10-3 (BCR-) - Body ground	Always	1 MΩ or higher

REPLACE FLOOR WIRE

5.	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.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
O10-1 (BDR+) - Body ground	Power switch on (IG)	Below 1 V
O10-2 (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
O10-1 (BDR+) - O10-2 (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
O10-1 (BDR+) - O10-2 (BDR-)	Always	1 MΩ or higher
O10-1 (BDR+) - Body ground	Always	1 MΩ or higher
O10-2 (BDR-) - Body ground	Always	1 MΩ or higher

GO TO STEP 7

6.	CHECK SIDE NO. 2 AIRBAG SENSOR RH

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

*1	Side No. 2 Airbag Sensor LH
*2	Airbag Sensor Assembly

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

(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 B1633 and B1638 may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B1633 is output.	A
DTC B1638 is output.	B
DTCs B1633 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.

REPLACE AIRBAG SENSOR ASSEMBLY

REPLACE SIDE NO. 2 AIRBAG 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 (-) auxiliary battery terminal.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
KO1-22 (BDR+) - Body ground	Power switch on (IG)	Below 1 V
KO1-40 (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
KO1-22 (BDR+) - KO1-40 (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
KO1-22 (BDR+) - KO1-40 (BDR-)	Always	1 MΩ or higher
KO1-22 (BDR+) - Body ground	Always	1 MΩ or higher
KO1-40 (BDR-) - Body ground	Always	1 MΩ or higher

REPLACE FRONT DOOR WIRE RH

REPLACE FLOOR WIRE