Toyota 4Runner: Passenger Airbag ON/OFF Indicator Circuit Malfunction (B1660/43)

Toyota 4Runner Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Passenger Airbag ON/OFF Indicator Circuit Malfunction (B1660/43)

DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag sensor assembly and passenger airbag ON/OFF indicator.

The passenger airbag ON/OFF indicator indicates the operation condition of the instrument panel passenger airbag, lower No. 2 instrument panel airbag, front seat side airbag RH and front seat outer belt RH.

DTC B1660/43 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC Code	DTC Detection Condition	Trouble Area
B1660/43	One of the following conditions is met: The airbag sensor assembly detects an open circuit signal, short circuit to ground signal or short circuit to B+ signal in the passenger airbag ON/OFF indicator circuit for 2 seconds. A passenger airbag ON/OFF indicator malfunction. An airbag sensor assembly malfunction.	Instrument panel wire Telltale light assembly Airbag sensor assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (See page ).

PROCEDURE

1.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

(a) Turn the ignition switch to ON.

(b) Check the passenger airbag ON/OFF indicator and passenger airbag indicator operation.

HINT:

Refer to the normal condition of the passenger airbag ON/OFF indicator (See page ).

Result

Result	Proceed to
Always on	A
Off	B

GO TO STEP 7

2.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

OK:

The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

3.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and telltale light assembly.

(b) Check that the connectors (on the airbag sensor assembly side and telltale light assembly side) are not damaged.

OK:

The connectors are not deformed or damaged.

Text in Illustration

*1	Telltale Light Assembly
*2	Airbag Sensor Assembly

REPLACE INSTRUMENT PANEL WIRE

4.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Connect the connector to the telltale light assembly.

(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(d) Check the passenger airbag ON/OFF indicator and passenger airbag indicator operation.

OK:

The passenger airbag ON/OFF indicator and passenger airbag indicator does not come on.

GO TO STEP 6

5.	CHECK AIRBAG SENSOR ASSEMBLY

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

(f) Clear the DTCs (See page ).

(g) Turn the ignition switch off.

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

(i) Check for DTCs (See page ).

OK:

DTC B1660 is not output.

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

Text in Illustration

*1	Telltale Light Assembly
*2	Airbag Sensor Assembly

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG SENSOR ASSEMBLY

6.	CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR - TELLTALE LIGHT)

(a) Turn the ignition switch off.

Text in Illustration

*1	Telltale Light Assembly	*2	Airbag Sensor Assembly
*3	Connector C	*4	Connector B
*5	Service Wire	-	-
*a	Front view of wire harness connector (to Telltale Light Assembly)	*b	Rear view of wire harness connector (to Airbag Sensor Assembly)

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F32-3 (PAON) - Body ground	Ignition switch ON	Below 1 V
F32-4 (P-AB) - Body ground	Ignition switch ON	Below 1 V

(f) Turn the ignition switch off.

(g) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(h) Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F32-3 (PAON) - F32-4 (P-AB)	Always	Below 1 Ω

(j) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F32-3 (PAON) - F32-4 (P-AB)	Always	1 MΩ or higher
F32-3 (PAON) - Body ground	Always	1 MΩ or higher
F32-4 (P-AB) - Body ground	Always	1 MΩ or higher

REPLACE TELLTALE LIGHT ASSEMBLY

REPLACE INSTRUMENT PANEL WIRE

7.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

OK:

The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

8.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag sensor assembly and telltale light assembly.

(b) Check that the connectors (on the airbag sensor assembly side and telltale light assembly side) are not damaged.

OK:

The connectors are not deformed or damaged.

Text in Illustration

*1	Telltale Light Assembly
*2	Airbag Sensor Assembly

REPLACE INSTRUMENT PANEL WIRE

9.	CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR - TELLTALE LIGHT)

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

Text in Illustration

*1	Telltale Light Assembly	*2	Airbag Sensor Assembly
*3	Connector C	*4	Connector B
*5	Service Wire	-	-
*a	Front view of wire harness connector (to Telltale Light Assembly)	*b	Rear view of wire harness connector (to Airbag Sensor Assembly)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F32-3 (PAON) - Body ground	Ignition switch ON	Below 1 V
F32-4 (P-AB) - Body ground	Ignition switch ON	Below 1 V

(d) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(e) Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.

NOTICE:

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F32-3 (PAON) - F32-4 (P-AB)	Always	Below 1 Ω

(g) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F32-3 (PAON) - F32-4 (P-AB)	Always	1 MΩ or higher
F32-3 (PAON) - Body ground	Always	1 MΩ or higher
F32-4 (P-AB) - Body ground	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

10.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE)

(a) Turn the ignition switch off.

(b) Connect the connectors to the airbag sensor assembly.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F32-7 (IG+) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Telltale Light Assembly)

REPLACE HARNESS AND CONNECTOR (TELLTALE LIGHT - BATTERY) OR BATTERY

11.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(d) Disconnect the connectors from the airbag sensor assembly.

(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(f) Check the indicator according to the value(s) in the table below.

OK:

Tester Connection	Switch Condition	Passenger airbag ON/OFF indicator
F33-23 (PAON) - Body ground	Ignition switch ON	"ON" comes on
F33-17 (P-AB) - Body ground	Ignition switch ON	"OFF" comes on

Text in Illustration

*a	Rear view of wire harness connector (to Airbag Sensor Assembly)

REPLACE TELLTALE LIGHT ASSEMBLY

12.	CHECK AIRBAG SENSOR ASSEMBLY

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(d) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

(f) Clear the DTCs (See page ).

(g) Turn the ignition switch off.

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

(i) Check for DTCs (See page ).

OK:

DTC B1660 is not output.

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

Text in Illustration

*1	Telltale Light Assembly
*2	Airbag Sensor Assembly

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG SENSOR ASSEMBLY

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