Toyota CH-R Service Manual: Side Airbag Sensor Assembly No.2 Lost Communication (LH) (B163B/86,B163C/86)

DESCRIPTION

The side collision sensor LH circuit (bus 2) consists of the airbag sensor assembly and floor side airbag sensor LH.

The floor side airbag sensor LH detects impacts to the vehicle and sends 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 LH circuit (bus 2).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Test Mode / Check Mode
B163B/86	Side Airbag Sensor Assembly No.2 Lost Communication (LH)	Any of the following conditions is met: The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 2) The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 2). The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 2). The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 2). Floor side airbag sensor LH malfunction Airbag sensor assembly malfunction	Floor wire Floor side airbag sensor LH Airbag sensor assembly	Does not apply to test/check mode
B163C/86	Side Airbag Sensor Assembly No.2 Initialization Error (LH)	Any of the following conditions is met: The airbag sensor assembly detects a line short in the side collision sensor LH circuit (bus 2) The airbag sensor assembly detects a short to ground in the side collision sensor LH circuit (bus 2). The airbag sensor assembly detects a short to B+ in the side collision sensor LH circuit (bus 2). The airbag sensor assembly detects an open in the side collision sensor LH circuit (bus 2). Floor side airbag sensor LH malfunction Airbag sensor assembly malfunction	Floor wire Floor side airbag sensor LH Airbag sensor assembly	Does not apply to test/check mode

DTC Detection Conditions (B163B/86):

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

DTC Detection Conditions (B163C/86):

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

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PROCEDURE

1.	CHECK 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 and floor side airbag sensor LH.

OK:

The connectors are properly connected.

HINT:

If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the airbag sensor assembly and floor side airbag sensor LH.

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

OK:

The terminals are not deformed or damaged.

NG

REPLACE FLOOR WIRE

OK

2.	CHECK FLOOR WIRE (OPEN)

(a) w/o Occupant Classification System

(1) Using a service wire, connect terminals 8 (BBL+) and 15 (BBL-) of connector B.

NOTICE:

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

(b) w/ Occupant Classification System

(1) Using a service wire, connect terminals 21 (BCL+) and 22 (BCL-) of connector B.

NOTICE:

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

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Floor Side Airbag Sensor LH	*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 Floor Side Airbag Sensor LH)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
M35-2 (BFL+) - M35-1 (BFL-)	Always	Below 1 Ω

(d) Disconnect the service wire from connector B.

NG

REPLACE FLOOR WIRE

OK

3.	CHECK FLOOR WIRE (SHORT)

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

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Floor Side Airbag Sensor LH	*2	Airbag Sensor Assembly
*3	Floor Wire	-	-
*a	Front view of wire harness connector (to Floor Side Airbag Sensor LH)	-	-

Standard Resistance:

Tester Connection	Condition	Specified Condition
M35-2 (BFL+) - M35-1 (BFL-)	Always	1 MΩ or higher

NG

REPLACE FLOOR WIRE

OK

4.	CHECK FLOOR WIRE (SHORT TO B+)

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

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Floor Side Airbag Sensor LH	*2	Airbag Sensor Assembly
*3	Floor Wire	-	-
*a	Front view of wire harness connector (to Floor Side Airbag Sensor LH)	-	-

(b) Turn the ignition switch ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
M35-2 (BFL+) - Body ground	Ignition switch ON	Below 1 V
M35-1 (BFL-) - 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.

NG

REPLACE FLOOR WIRE

OK

5.	CHECK FLOOR WIRE (SHORT TO GROUND)

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

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Floor Side Airbag Sensor LH	*2	Airbag Sensor Assembly
*3	Floor Wire	-	-
*a	Front view of wire harness connector (to Floor Side Airbag Sensor LH)	-	-

Standard Resistance:

Tester Connection	Condition	Specified Condition
M35-2 (BFL+) - Body ground	Always	1 MΩ or higher
M35-1 (BFL-) - Body ground	Always	1 MΩ or higher

NG

REPLACE FLOOR WIRE

OK

6.	CHECK FLOOR SIDE AIRBAG SENSOR LH

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

*A w/o Occupant Classification System *B w/ Occupant Classification System *1 Floor Side Airbag Sensor RH *2 Airbag Sensor Assembly

(b) Interchange the floor side airbag sensor LH with RH and connect the connectors.

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

(d) Clear the DTCs stored in memory.

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Body Electrical > SRS Airbag > Clear DTCs

(e) Turn the ignition switch off.

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

(g) Check for DTCs.

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Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B162B/85, B162C/85, B163B/86 and B163C/86 may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B163B/86 or B163C/86 is output.	A
DTC B162B/85 or B162C/85 is output.	B
DTCs B162B/85, B162C/85, B163B/86 and B163C/86 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 floor side airbag sensor LH and RH to their original positions and connect the connectors.

A

REPLACE AIRBAG SENSOR ASSEMBLY

B

REPLACE FLOOR SIDE AIRBAG SENSOR LH

C

USE SIMULATION METHOD TO CHECK