SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): B1642,B1643; Side Satellite Sensor Bus Lost Communication (RH); 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001W7FR
Model Year Start: 2020	Model: GR Corolla	Prod Date Range: [03/2019 - 09/2022]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for TMMMS Made): B1642,B1643; Side Satellite Sensor Bus Lost Communication (RH); 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]

DTC

B1642

Side Satellite Sensor Bus Lost Communication (RH)

DTC

B1643

Side Satellite Sensor Bus 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.

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
B1642	Side Satellite Sensor Bus Lost Communication (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 Side airbag pressure sensor RH malfunction Airbag sensor assembly malfunction	Floor wire Front door wire RH Side No. 2 airbag sensor RH Side airbag pressure sensor RH Airbag sensor assembly	Comes on	Does not apply to test/check mode
B1643	Side Satellite Sensor Bus 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 Side airbag pressure sensor RH malfunction Airbag sensor assembly malfunction	Floor wire Front door wire RH Side No. 2 airbag sensor RH Side airbag pressure sensor RH Airbag sensor assembly	Comes on	Does not apply to test/check mode

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition 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 ignition 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 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

2.	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

3.	CHECK FLOOR WIRE

(a) Connect the cable to the negative (-) 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 ignition switch to ON.

Standard Voltage:

Tester Connection	Condition	Specified Condition
O10-4 (BCR+) - Body ground	Ignition switch ON	Below 1 V
O10-3 (BCR-) - Body ground	Ignition switch ON	Below 1 V

(d) Turn the ignition 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
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

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
O10-1 (BDR+) - Body ground	Ignition switch ON	Below 1 V
O10-2 (BDR-) - Body ground	Ignition switch ON	Below 1 V

(e) Turn the ignition 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
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

5.	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 ignition switch to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

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.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1642, B1643, B1647 and B1648 may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B1642 or B1643 is output.	A
DTC B1647 or B1648 is output.	B
DTCs B1642, B1643, B1647 and B1648 are not output.	C

(i) Turn the ignition 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 ignition switch off.

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

(g) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1642, B1643, B1647 and B1648 may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B1642 or B1643 is output.	A
DTC B1647 or B1648 is output.	B
DTCs B1642, B1643, B1647 and B1648 are not output.	C

(h) Turn the ignition 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 SENSOR 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
KO1-22 (BDR+) - Body ground	Ignition switch ON	Below 1 V
KO1-40 (BDR-) - Body ground	Ignition switch ON	Below 1 V

(e) Turn the ignition 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
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