Toyota CH-R Service Manual: Rear Airbag Sensor LH Circuit Malfunction (B1635/24)

Toyota CH-R Service Manual / Supplemental Restraint Systems / Airbag System / Rear Airbag Sensor LH Circuit Malfunction (B1635/24)

DESCRIPTION

The side collision sensor LH circuit (bus 1) consists of the airbag sensor assembly, door side airbag sensor LH, No. 1 side airbag sensor LH and No. 2 side airbag sensor LH.

The door side airbag sensor LH, No. 1 side airbag sensor LH and No. 2 side airbag sensor LH detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbags and pretensioners should be deployed.

DTC B1635/24 is stored when a malfunction is detected in the No. 2 side airbag sensor LH.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Test Mode / Check Mode
B1635/24	Rear Airbag Sensor LH Circuit Malfunction	Any of the following conditions is met: No. 2 side airbag sensor LH malfunction Airbag sensor assembly malfunction	No. 2 side airbag sensor LH Airbag sensor assembly	Does not apply to test/check mode

DTC Detection Conditions:

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction Status	No. 2 side airbag sensor LH malfunction	○	-
Malfunction Status	Airbag sensor assembly malfunction	-	○
Detection Time		-	-
Number of Trips		1 trip	1 trip

HINT:

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

WIRING DIAGRAM

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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 NO. 2 SIDE AIRBAG SENSOR LH

(a) Turn the ignition switch off.

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

(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.

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

(e) Clear the DTCs stored in memory.

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Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the ignition switch off.

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

(h) Check for DTCs.

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Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1630/23 and B1635/24 may be output at this time, but they are not related to this check.

Result	Proceed to
DTC B1635/24 is output.	A
DTC B1630/23 is output.	B
DTCs B1630/23 and B1635/24 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 No. 2 side airbag sensor LH and RH to their original positions and connect the connectors.

REPLACE AIRBAG SENSOR ASSEMBLY

REPLACE NO. 2 SIDE AIRBAG SENSOR LH

USE SIMULATION METHOD TO CHECK

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