Supplemental Restraint Systems. Dtc B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

The passenger airbag ON/OFF indicator circuit consists of the center airbag sensor and the passenger airbag ON/OFF indicator.
The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag, front passenger side knee airbag, front seat 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	When one of the following conditions is met: The center airbag sensor receives an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the passenger airbag ON/OFF indicator circuit for 2 seconds. A passenger airbag ON/OFF indicator malfunction. A center airbag sensor malfunction.	Instrument panel wire Multi-display assembly1 Clock2 Center airbag sensor assembly No. 2 instrument panel wire No. 5 instrument panel wire*2

HINT:

*1: w/ Navigation System

*2: w/o Navigation System

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System.
Dtc
B1660/43 Passenger Airbag On/Off Indicator Circuit Malfunction

INSPECTION PROCEDURE

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).
When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

1.CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

Turn the ignition switch to ON.

Check the passenger airbag ON/OFF indicator operation.
HINT:
Refer to the normal condition of the passenger airbag ON/OFF indicator (Click here).
Result
Result
Proceed to
Always on
A
Off
B

Go to step 9

A

2.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

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

Check that the connectors are properly connected to the center airbag sensor and the multi-display assembly or clock.
OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

3.CHECK CONNECTORS

Disconnect the connectors from the center airbag sensor and the multi-display assembly or clock.

Check that the connectors (on the center airbag sensor side and multi-display assembly side or clock side) are not damaged.
OK:
The connectors are not deformed or damaged.

REPLACE HARNESS AND CONNECTOR

OK

4.CHECK PASSENGER AIRBAG ON/OFF INDICATOR

Connect the connector to the multi-display assembly or clock.

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

Turn the ignition switch to ON.

Check the passenger airbag ON/OFF indicator operation.
OK:
The passenger airbag ON/OFF indicator does not come on.

Go to step 6

OK

5.CHECK CENTER AIRBAG SENSOR

Connect the connector to the center airbag sensor.

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

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

Clear the DTCs (Click here).

Turn the ignition switch off.

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

Check for DTCs (Click here).
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.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

USE SIMULATION METHOD TO CHECK (Click here)

6.CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT

Turn the ignition switch off.

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

Disconnect the connector from the center airbag sensor and multi-display assembly or clock.

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

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

Standard Voltage:
w/ Navigation System
Tester Connection
Switch Condition
Specified Condition
F79-20 (ARON) - Body ground
Ignition switch ON
Below 1 V
F79-8 (AIR) - Body ground
Ignition switch ON
Below 1 V
w/o Navigation System
Tester Connection
Switch Condition
Specified Condition
g1-3 (PAON) - Body ground
Ignition switch ON
Below 1 V
g1-2 (P-AB) - Body ground
Ignition switch ON
Below 1 V

w/ Navigation System
Tester Connection	Switch Condition	Specified Condition
F79-20 (ARON) - Body ground	Ignition switch ON	Below 1 V
F79-8 (AIR) - Body ground	Ignition switch ON	Below 1 V

w/o Navigation System
Tester Connection	Switch Condition	Specified Condition
g1-3 (PAON) - Body ground	Ignition switch ON	Below 1 V
g1-2 (P-AB) - Body ground	Ignition switch ON	Below 1 V

Turn the ignition switch off.

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

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.

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

Standard Resistance:
w/ Navigation System
Tester Connection
Condition
Specified Condition
F79-20 (ARON) - F79-8 (AIR)
Always
Below 1 Ω
w/o Navigation System
Tester Connection
Condition
Specified Condition
g1-3 (PAON) - g1-2 (P-AB)
Always
Below 1 Ω

Disconnect the service wire from connector B.

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

Standard Resistance:

w/ Navigation System
Tester Connection	Condition	Specified Condition
F79-20 (ARON) - F79-8 (AIR)	Always	1 MΩ or higher
F79-20 (ARON) - Body ground	Always	1 MΩ or higher
F79-8 (AIR) - Body ground	Always	1 MΩ or higher

w/o Navigation System
Tester Connection	Condition	Specified Condition
g1-3 (PAON) - g1-2 (P-AB)	Always	1 MΩ or higher
g1-3 (PAON) - Body ground	Always	1 MΩ or higher
g1-2 (P-AB) - Body ground	Always	1 MΩ or higher

Result
Result	Proceed to
OK (w/ Navigation System)	A
OK (w/o Navigation System)	B
NG	C

REPLACE CLOCK (Click here)

Go to step 7

REPLACE MULTI-DISPLAY ASSEMBLY (Click here)

7.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE)

Disconnect the instrument panel wire connector from the No. 2 instrument panel wire.

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

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
FE4-13 (PAON) - Body ground
Ignition switch ON
Below 1 V
FE4-12 (P-AB) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

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.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
FE4-13 (PAON) - FE4-12 (P-AB)
Always
Below 1 Ω

Disconnect the service wire from connector B.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
FE4-13 (PAON) - FE4-12 (P-AB)
Always
1 MΩ or higher
FE4-13 (PAON) - Body ground
Always
1 MΩ or higher
FE4-12 (P-AB) - Body ground
Always
1 MΩ or higher
Result
Result
Proceed to
OK (w/ Navigation System)
A
OK (w/o Navigation System)
B
NG
C

Go to step 8

REPLACE INSTRUMENT PANEL WIRE

REPLACE NO. 2 INSTRUMENT PANEL WIRE

8.CHECK NO. 2 INSTRUMENT PANEL WIRE (INSTRUMENT PANEL WIRE - NO. 5 INSTRUMENT PANEL WIRE)

Disconnect the No. 2 instrument panel wire connector from the No. 5 instrument panel wire.

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

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

Standard Voltage:
w/o Cassette Type Player
Tester Connection
Switch Condition
Specified Condition
gF1-3 (PAON) - Body ground
Ignition switch ON
Below 1 V
gF1-4 (P-AB) - Body ground
Ignition switch ON
Below 1 V
w/ Cassette Type Player
Tester Connection
Switch Condition
Specified Condition
Fg1-3 (PAON) - Body ground
Ignition switch ON
Below 1 V
Fg1-2 (P-AB) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

Using a service wire, connect terminals 13 (PAON) and 12 (P-AB) of connector D.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

Standard Resistance:
w/o Cassette Type Player
Tester Connection
Condition
Specified Condition
gF1-3 (PAON) - gF1-4 (P-AB)
Always
Below 1 Ω
w/ Cassette Type Player
Tester Connection
Condition
Specified Condition
Fg1-3 (PAON) - Fg1-2 (P-AB)
Always
Below 1 Ω

Disconnect the service wire from connector D.

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

Standard Resistance:

w/o Cassette Type Player
Tester Connection	Condition	Specified Condition
gF1-3 (PAON) - gF1-4 (P-AB)	Always	1 MΩ or higher
gF1-3 (PAON) - Body ground	Always	1 MΩ or higher
gF1-4 (P-AB) - Body ground	Always	1 MΩ or higher

w/ Cassette Type Player
Tester Connection	Condition	Specified Condition
Fg1-3 (PAON) - Fg1-2 (P-AB)	Always	1 MΩ or higher
Fg1-3 (PAON) - Body ground	Always	1 MΩ or higher
Fg1-2 (P-AB) - Body ground	Always	1 MΩ or higher

REPLACE NO. 2 INSTRUMENT PANEL WIRE

REPLACE NO. 5 INSTRUMENT PANEL WIRE

9.CHECK CONNECTION OF CONNECTORS

Turn the ignition switch off.

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

Check that the connectors are properly connected to the center airbag sensor and the multi-display assembly or clock.
OK:
The connectors are properly connected.

CONNECT CONNECTORS PROPERLY

OK

10.CHECK CONNECTORS

Disconnect the connectors from the center airbag sensor and the multi-display assembly or clock.

Check that the connectors (on the center airbag sensor side and multi-display assembly side or clock side) are not damaged.
OK:
The connectors are not deformed or damaged.

REPLACE HARNESS AND CONNECTOR

OK

11.CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT

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

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

Standard Voltage:
w/ Navigation System
Tester Connection
Switch Condition
Specified Condition
F79-20 (ARON) - Body ground
Ignition switch ON
Below 1 V
F79-8 (AIR) - Body ground
Ignition switch ON
Below 1 V
w/o Navigation System
Tester Connection
Switch Condition
Specified Condition
g1-3 (PAON) - Body ground
Ignition switch ON
Below 1 V
g1-2 (P-AB) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

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.

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

Standard Resistance:
w/ Navigation System
Tester Connection
Condition
Specified Condition
F79-20 (ARON) - F79-8 (AIR)
Always
Below 1 Ω
w/o Navigation System
Tester Connection
Condition
Specified Condition
g1-3 (PAON) - g1-2 (P-AB)
Always
Below 1 Ω

Disconnect the service wire from connector B.

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

Standard Resistance:

w/ Navigation System
Tester Connection	Condition	Specified Condition
F79-20 (ARON) - F79-8 (AIR)	Always	1 MΩ or higher
F79-20 (ARON) - Body ground	Always	1 MΩ or higher
F79-8 (AIR) - Body ground	Always	1 MΩ or higher

w/o Navigation System
Tester Connection	Condition	Specified Condition
g1-3 (PAON) - g1-2 (P-AB)	Always	1 MΩ or higher
g1-3 (PAON) - Body ground	Always	1 MΩ or higher
g1-2 (P-AB) - Body ground	Always	1 MΩ or higher

Go to step 15

OK

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

Turn the ignition switch off.

Connect the connectors to the center airbag sensor.

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

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

Standard Voltage:
w/ Navigation System
Tester Connection
Switch Condition
Specified Condition
F64-3 (IG) - Body ground
Ignition switch ON
11 to 14 V
w/o Navigation System
Tester Connection
Switch Condition
Specified Condition
g1-10 (IG+) - Body ground
Ignition switch ON
11 to 14 V
Result
Result
Proceed to
OK
A
NG (w/ Navigation System)
B
NG (w/o Navigation System)
C

REPLACE HARNESS AND CONNECTOR (MULTI-DISPLAY - BATTERY) OR BATTERY

REPLACE HARNESS AND CONNECTOR (CLOCK - BATTERY) OR BATTERY

A

13.CHECK PASSENGER AIRBAG ON/OFF INDICATOR

Turn the ignition switch off.

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

Connect the connector to the multi-display assembly or clock.

Disconnect the connectors from the center airbag sensor.

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

Check the indicator according to the table below.
OK:
Tester Connection
Switch Condition
Passenger airbag ON/OFF indicator
E47-23 (PAON) - Body ground
Ignition switch ON
"ON" comes on
E47-17 (P-AB) - Body ground
Ignition switch ON
"OFF" comes on
Result
Result
Proceed to
OK
A
NG (w/ Navigation System)
B
NG (w/o Navigation System)
C

REPLACE MULTI-DISPLAY ASSEMBLY (Click here)

REPLACE CLOCK (Click here)

A

14.CHECK CENTER AIRBAG SENSOR

Turn the ignition switch off.

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

Connect the connectors to the center airbag sensor.

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

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

Clear the DTCs (Click here).

Turn the ignition switch off.

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

Check for DTCs (Click here).
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.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

USE SIMULATION METHOD TO CHECK (Click here)

15.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE)

Disconnect the instrument panel wire connector from the No. 2 instrument panel wire.

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

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
FE4-13 (PAON) - Body ground
Ignition switch ON
Below 1 V
FE4-12 (P-AB) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

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.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
FE4-13 (PAON) - FE4-12 (P-AB)
Always
Below 1 Ω

Disconnect the service wire from connector B.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
FE4-13 (PAON) - FE4-12 (P-AB)
Always
1 MΩ or higher
FE4-13 (PAON) - Body ground
Always
1 MΩ or higher
FE4-12 (P-AB) - Body ground
Always
1 MΩ or higher
Result
Result
Proceed to
OK (w/ Navigation System)
A
OK (w/o Navigation System)
B
NG
C

Go to step 16

REPLACE INSTRUMENT PANEL WIRE

REPLACE NO. 2 INSTRUMENT PANEL WIRE

16.CHECK NO. 2 INSTRUMENT PANEL WIRE (INSTRUMENT PANEL WIRE - NO. 5 INSTRUMENT PANEL WIRE)

Disconnect the No. 2 instrument panel wire connector from the No. 5 instrument panel wire.

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

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

Standard Voltage:
w/o Cassette Type Player
Tester Connection
Switch Condition
Specified Condition
gF1-3 (PAON) - Body ground
Ignition switch ON
Below 1 V
gF1-4 (P-AB) - Body ground
Ignition switch ON
Below 1 V
w/ Cassette Type Player
Tester Connection
Switch Condition
Specified Condition
Fg1-3 (PAON) - Body ground
Ignition switch ON
Below 1 V
Fg1-2 (P-AB) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

Using a service wire, connect terminals 13 (PAON) and 12 (P-AB) of connector D.
NOTICE:
Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

Standard Resistance:
w/o Cassette Type Player
Tester Connection
Condition
Specified Condition
gF1-3 (PAON) - gF1-4 (P-AB)
Always
Below 1 Ω
w/ Cassette Type Player
Tester Connection
Condition
Specified Condition
Fg1-3 (PAON) - Fg1-2 (P-AB)
Always
Below 1 Ω

Disconnect the service wire from connector D.

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

Standard Resistance:

w/o Cassette Type Player
Tester Connection	Condition	Specified Condition
gF1-3 (PAON) - gF1-4 (P-AB)	Always	1 MΩ or higher
gF1-3 (PAON) - Body ground	Always	1 MΩ or higher
gF1-4 (P-AB) - Body ground	Always	1 MΩ or higher

w/ Cassette Type Player
Tester Connection	Condition	Specified Condition
Fg1-3 (PAON) - Fg1-2 (P-AB)	Always	1 MΩ or higher
Fg1-3 (PAON) - Body ground	Always	1 MΩ or higher
Fg1-2 (P-AB) - Body ground	Always	1 MΩ or higher

REPLACE NO. 2 INSTRUMENT PANEL WIRE

REPLACE NO. 5 INSTRUMENT PANEL WIRE

Result	Proceed to
OK	A
NG (w/ Navigation System)	B
NG (w/o Navigation System)	C

Tester Connection	Switch Condition	Passenger airbag ON/OFF indicator
E47-23 (PAON) - Body ground	Ignition switch ON	"ON" comes on
E47-17 (P-AB) - Body ground	Ignition switch ON	"OFF" comes on