Toyota Corolla Cross: Left Side Restraints Sensor 5 Value of Signal Protection Calculation Incorrect (B009B83)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Left Side Restraints Sensor 5 Value of Signal Protection Calculation Incorrect (B009B83)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B009B83	Left Side Restraints Sensor 5 Value of Signal Protection Calculation Incorrect	One of the following conditions is met: The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the side collision sensor LH circuit (bus 1) for 2 seconds. Side airbag pressure sensor LH malfunction Airbag ECU assembly malfunction	Harness or connector Side airbag pressure sensor LH Airbag ECU assembly	Comes on	Not applicable

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Test Mode / Check Mode

B009B83

Left Side Restraints Sensor 5 Value of Signal Protection Calculation Incorrect

One of the following conditions is met:

The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the side collision sensor LH circuit (bus 1) for 2 seconds.
Side airbag pressure sensor LH malfunction
Airbag ECU assembly malfunction

Harness or connector
Side airbag pressure sensor LH
Airbag ECU assembly

Comes on

Not applicable

DTC Detection Conditions:

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5	Pattern 6
Diagnosis Condition	Ignition switch ON	○	○	○	○	○	○
Malfunction Status	The airbag ECU assembly detects a line short circuit signal in the side collision sensor LH circuit (bus 1).	○	-	-	-	-	-
	The airbag ECU assembly detects an open circuit signal in the side collision sensor LH circuit (bus 1).	-	○	-	-	-	-
	The airbag ECU assembly detects a short circuit to ground signal in the side collision sensor LH circuit (bus 1).	-	-	○	-	-	-
	The airbag ECU assembly detects a short circuit to B+ signal in the side collision sensor LH circuit (bus 1).	-	-	-	○	-	-
	Side airbag pressure sensor LH malfunction	-	-	-	-	○	-
	Airbag ECU assembly malfunction	-	-	-	-	-	○
Detection Time		2 seconds	2 seconds	2 seconds	2 seconds	2 seconds	2 seconds
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.
Click here

HINT:

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Click here
After replacing the airbag ECU assembly, refer to initialization.
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 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

OK:

The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

2.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly and side airbag pressure sensor LH.

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

OK:

The terminals of the connectors are not deformed or damaged.

*1	Side Airbag Pressure Sensor LH
*2	Airbag ECU Assembly
*3	Wire Harness

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (SHORT)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L6-2 (BDL+) - L6-1 (BDL-)	Always	1 MΩ or higher

*1	Side Airbag Pressure Sensor LH
*2	Airbag ECU Assembly
*3	Wire Harness
*a	Front view of wire harness connector (to Side Airbag Pressure Sensor LH)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (SHORT TO GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L6-2 (BDL+) - Body ground	Always	1 MΩ or higher
L6-1 (BDL-) - Body ground	Always	1 MΩ or higher

*1	Side Airbag Pressure Sensor LH
*2	Airbag ECU Assembly
*3	Wire Harness
*a	Front view of wire harness connector (to Side Airbag Pressure Sensor LH)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (SHORT TO B+)

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

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
L6-2 (BDL+) - Body ground	Ignition switch ON	Below 1 V
L6-1 (BDL-) - Body ground	Ignition switch ON	Below 1 V

Result:

Proceed to
OK
NG

*1	Side Airbag Pressure Sensor LH
*2	Airbag ECU Assembly
*3	Wire Harness
*a	Front view of wire harness connector (to Side Airbag Pressure Sensor LH)

(d) Turn the ignition switch off.

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

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (OPEN)

(a) Using a service wire, connect terminals 32 (BBL+) and 31 (BBL-) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L6-2 (BDL+) - L6-1 (BDL-)	Always	Below 1 Ω

Result:

Proceed to
OK
NG

*1	Side Airbag Pressure Sensor LH
*2	Airbag ECU Assembly
*3	Wire Harness
*4	Service Wire
*a	Front view of wire harness connector (to Side Airbag Pressure Sensor LH)
*b	Front view of wire harness connector (to Airbag ECU Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

(a) Connect the connector to the airbag ECU assembly.

*1	Side Airbag Pressure Sensor RH
*2	Airbag ECU Assembly

(b) Interchange the side airbag pressure sensor LH with RH 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.

8.	CHECK SIDE AIRBAG PRESSURE SENSOR LH

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

(b) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes

Result	Proceed to
B009B83 is output	A
B009E83 is output	B
B009B83 and B009E83 are not output	C

HINT:

Codes other than DTCs B009B83 and B009E83 may be output at this time, but they are not related to this check.

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

CAUTION:

Wait at least 60 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

REPLACE AIRBAG ECU ASSEMBLY

REPLACE SIDE AIRBAG PRESSURE SENSOR LH

USE SIMULATION METHOD TO CHECK

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Toyota Corolla Cross: Left Side Restraints Sensor 5 Value of Signal Protection Calculation Incorrect (B009B83)

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