Toyota CH-R Service Manual: Lost Communication with Front Airbag Sensor RH (B1612/83,B1613/83)

Toyota CH-R Service Manual / Supplemental Restraint Systems / Airbag System / Lost Communication with Front Airbag Sensor RH (B1612/83,B1613/83)

DESCRIPTION

The front airbag sensor RH circuit consists of the airbag sensor assembly and front airbag sensor RH.

The front airbag sensor RH 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 front airbag sensor RH circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Test Mode / Check Mode
B1612/83	Lost Communication with Front Airbag Sensor RH	Any of the following conditions is met: The airbag sensor assembly detects a line short in the front airbag sensor RH circuit. The airbag sensor assembly detects a short to ground in the front airbag sensor RH circuit. The airbag sensor assembly detects a short to B+ in the front airbag sensor RH circuit. The airbag sensor assembly detects an open in the front airbag sensor RH circuit. Front airbag sensor RH malfunction Airbag sensor assembly malfunction	Instrument panel wire Engine room main wire Front airbag sensor RH Airbag sensor assembly	Does not apply to test/check mode
B1613/83	Front Airbag Sensor RH Initialization Incomplete	Any of the following conditions is met: The airbag sensor assembly detects a line short in the front airbag sensor RH circuit. The airbag sensor assembly detects a short to ground in the front airbag sensor RH circuit. The airbag sensor assembly detects a short to B+ in the front airbag sensor RH circuit. The airbag sensor assembly detects an open in the front airbag sensor RH circuit. Front airbag sensor RH malfunction Airbag sensor assembly malfunction	Instrument panel wire Engine room main wire Front airbag sensor RH Airbag sensor assembly	Does not apply to test/check mode

DTC Detection Conditions (B1612/83):

		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 front airbag sensor RH circuit	○	-	-	-	-	-
	The airbag sensor assembly detects a short to ground in the front airbag sensor RH circuit	-	○	-	-	-	-
	The airbag sensor assembly detects a short to B+ in the front airbag sensor RH circuit	-	-	○	-	-	-
	The airbag sensor assembly detects an open in the front airbag sensor RH circuit	-	-	-	○	-	-
	Front airbag sensor RH 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 (B1613/83):

		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 front airbag sensor RH circuit	○	-	-	-	-	-
	The airbag sensor assembly detects a short to ground in the front airbag sensor RH circuit	-	○	-	-	-	-
	The airbag sensor assembly detects a short to B+ in the front airbag sensor RH circuit	-	-	○	-	-	-
	The airbag sensor assembly detects an open in the front airbag sensor RH circuit	-	-	-	○	-	-
	Front airbag sensor RH 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.

Click here

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 front airbag sensor RH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.

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 front airbag sensor RH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.

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

OK:

The terminals are not deformed or damaged.

REPLACE WIRE HARNESS

2.	CHECK FRONT AIRBAG SENSOR RH CIRCUIT (OPEN)

(a) Connect the connectors that link the engine room main wire and instrument panel wire.

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

(b) Using a service wire, connect terminals 29 (+SR) and 27 (-SR) of connector B.

NOTICE:

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A30-2 (+SR) - A30-1 (-SR)	Always	Below 1 Ω

GO TO STEP 10

3.	CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT)

(a) Disconnect the service wire from connector B.

w/o Occupant Classification System

w/ Occupant Classification System

Front Airbag Sensor RH

Airbag Sensor Assembly

Front view of wire harness connector

(to Front Airbag Sensor RH)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A30-2 (+SR) - A30-1 (-SR)	Always	1 MΩ or higher

GO TO STEP 9

4.	CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT TO B+)

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

w/o Occupant Classification System

w/ Occupant Classification System

Front Airbag Sensor RH

Airbag Sensor Assembly

Front view of wire harness connector

(to Front Airbag Sensor RH)

(b) Turn the ignition switch ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A30-2 (+SR) - Body ground	Ignition switch ON	Below 1 V
A30-1 (-SR) - 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.

GO TO STEP 8

5.	CHECK FRONT AIRBAG SENSOR RH CIRCUIT (SHORT TO GROUND)

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

w/o Occupant Classification System

w/ Occupant Classification System

Front Airbag Sensor RH

Airbag Sensor Assembly

Front view of wire harness connector

(to Front Airbag Sensor RH)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A30-2 (+SR) - Body ground	Always	1 MΩ or higher
A30-1 (-SR) - Body ground	Always	1 MΩ or higher

GO TO STEP 7

6.	CHECK FRONT AIRBAG SENSOR RH

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

*A	w/o Occupant Classification System
*B	w/ Occupant Classification System
*1	Front Airbag Sensor LH
*2	Airbag Sensor Assembly

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

(d) Clear the DTCs stored in memory.

Click here

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.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTCs B1612/83, B1613/83, B1617/84 and B1618/84 may be output at this time, but they are not related to this check.

Result	Proceed to
DTCs B1612/83, B1613/83, B1617/84 and B1618/84 are not output.	A
DTC B1617/84 or B1618/84 is output.	B
DTC B1612/83 or B1613/83 is 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 front airbag sensor RH and LH to their original positions and connect the connectors.

USE SIMULATION METHOD TO CHECK

REPLACE FRONT AIRBAG SENSOR RH

REPLACE AIRBAG SENSOR ASSEMBLY

7.	CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

(a) Disconnect the instrument panel wire connector from the engine room main wire.

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Front Airbag Sensor RH	*2	Airbag Sensor Assembly
*3	Engine Room Main Wire	*4	Instrument Panel Wire
*a	Front view of wire harness connector (to Engine Room Main Wire)	-	-

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
AF5-4 (+SR) - Body ground	Always	1 MΩ or higher
AF5-3 (-SR) - Body ground	Always	1 MΩ or higher

REPLACE ENGINE ROOM MAIN WIRE

REPLACE INSTRUMENT PANEL WIRE

8.	CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

(a) Disconnect the instrument panel wire connector from the engine room main wire.

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Front Airbag Sensor RH	*2	Airbag Sensor Assembly
*3	Engine Room Main Wire	*4	Instrument Panel Wire
*a	Front view of wire harness connector (to Engine Room Main Wire)	-	-

(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	Switch Condition	Specified Condition
AF5-4 (+SR) - Body ground	Ignition switch ON	Below 1 V
AF5-3 (-SR) - Body ground	Ignition switch ON	Below 1 V

REPLACE ENGINE ROOM MAIN WIRE

REPLACE INSTRUMENT PANEL WIRE

9.	CHECK INSTRUMENT PANEL WIRE (SHORT)

(a) Disconnect the instrument panel wire connector from the engine room main wire.

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Front Airbag Sensor RH	*2	Airbag Sensor Assembly
*3	Engine Room Main Wire	*4	Instrument Panel Wire
*a	Front view of wire harness connector (to Engine Room Main Wire)	-	-

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
AF5-4 (+SR) - AF5-3 (-SR)	Always	1 MΩ or higher

REPLACE ENGINE ROOM MAIN WIRE

REPLACE INSTRUMENT PANEL WIRE

10.	CHECK INSTRUMENT PANEL WIRE (OPEN)

(a) Disconnect the instrument panel wire connector from the engine room main wire.

HINT:

The service wire has already been inserted into connector B.

*A	w/o Occupant Classification System	*B	w/ Occupant Classification System
*1	Front Airbag Sensor RH	*2	Airbag Sensor Assembly
*3	Engine Room Main Wire	*4	Instrument Panel Wire
*5	Service Wire	-	-
*a	Front view of wire harness connector (to Airbag Sensor Assembly)	*b	Front view of wire harness connector (to Engine Room Main Wire)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
AF5-4 (+SR) - AF5-3 (-SR)	Always	Below 1 Ω

REPLACE ENGINE ROOM MAIN WIRE

REPLACE INSTRUMENT PANEL WIRE

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