DTC    B1660/43    Passenger Airbag ON/OFF Indicator Circuit Malfunction

for Preparation Click here


DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag sensor assembly and combination switch assembly (passenger airbag ON/OFF indicator).
The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag and front passenger side knee airbag.
DTC B1660/43 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1660/43
  1. The airbag sensor assembly receives a line short circuit signal, 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.
  2. Combination switch assembly malfunction
  3. Airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Combination switch assembly (Passenger airbag ON/OFF indicator)
  3. Airbag sensor assembly

WIRING DIAGRAM


C171047E07


INSPECTION PROCEDURE

NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).

1.CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

  1. Turn the power switch on (IG).

  1. Check the passenger airbag ON/OFF indicator operation.

    HINT:
    Refer to the normal condition of the passenger airbag ON/OFF indicator (Click here).

    Result:
    ON/OFF Indicator Illumination
    		Proceed to
    Always ON
    		A
    OFF
    		B



B
Go to step 9
A


2.CHECK CONNECTORS

  1. Turn the power switch off.

  1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

  1. Check that the connectors are properly connected to the airbag sensor assembly and combination switch assembly.

    OK:
    The connectors are properly connected.

    HINT:
    If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

  1. Disconnect the connectors from the airbag sensor assembly and combination switch assembly.

  1. Check that the terminals of the connectors are not damaged.

    OK:
    The terminals are not deformed or damaged.



NG
REPLACE INSTRUMENT PANEL WIRE
OK


3.CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    C233989

  1. Connect the connector to the combination switch assembly.

  1. Connect the cable to the negative (-) auxiliary battery terminal.

  1. Turn the power switch on (IG).

  1. Check the passenger airbag ON/OFF indicator operation.

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



NG
Go to step 5
OK


4.CHECK AIRBAG SENSOR ASSEMBLY


    C126705E01

  1. Turn the power switch off.

  1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

  1. Connect the connector to the airbag sensor assembly.

  1. Connect the cable to the negative (-) auxiliary battery terminal.

  1. Turn the power switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the power switch off.

  1. Turn the power switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    OK:
    DTC B1660/43 is not output.

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly

    HINT:
    Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.



NG
REPLACE AIRBAG SENSOR ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)  

5.CHECK INSTRUMENT PANEL WIRE (OPEN)


  1. Turn the power switch off.


    C234322E01

  1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

  1. Disconnect the connector from the combination switch assembly.

  1. Using SST, connect terminals 23 (PAON) and 17 (P-AB) of connector B.

    NOTICE:
    Do not forcibly insert SST into the terminals of the connector when connecting the wire.

SST
09843-18040  

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H72-19 (PAON) - H72-20 (P-AB)
    		Always
    		Below 1 Ω


    Text in Illustration 
    *1
    		Combination Switch Assembly
    		*2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    		*4
    		Connector B
    *5
    		Connector C
    		-
    		-
    *a
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)
    		*b
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


6.CHECK INSTRUMENT PANEL WIRE (SHORT)
C234323E01

  1. Disconnect SST from connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H72-19 (PAON) - H72-20 (P-AB)
    		Always
    		1 MΩ or higher

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


7.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    C234323E01

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H72-19 (PAON) - Body ground
    		Always
    		1 MΩ or higher
    H72-20 (P-AB) - Body ground
    		Always
    		1 MΩ or higher

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


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


    C234323E01

  1. Connect the cable to the negative (-) auxiliary battery terminal.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H72-19 (PAON) - Body ground
    		Power switch on (IG)
    		Below 1 V
    H72-20 (P-AB) - Body ground
    		Power switch on (IG)
    		Below 1 V

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE COMBINATION SWITCH ASSEMBLY (Click here)  

9.CHECK CONNECTORS

  1. Turn the power switch off.

  1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

  1. Check that the connectors are properly connected to the airbag sensor assembly and combination switch assembly.

    OK:
    The connectors are properly connected.

    HINT:
    If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

  1. Disconnect the connectors from the airbag sensor assembly and combination switch assembly.

  1. Check that the terminals of the connectors are not damaged.

    OK:
    The terminals are not deformed or damaged.



NG
REPLACE INSTRUMENT PANEL WIRE
OK


10.CHECK INSTRUMENT PANEL WIRE (OPEN)


  1. Using SST, connect terminals 23 (PAON) and 17 (P-AB) of connector B.


    C234322E01

    NOTICE:
    Do not forcibly insert SST into the terminals of the connector when connecting the wire.

SST
09843-18040  

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H72-19 (PAON) - H72-20 (P-AB)
    		Always
    		Below 1 Ω


    Text in Illustration 
    *1
    		Combination Switch Assembly
    		*2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    		*4
    		Connector B
    *5
    		Connector C
    		-
    		-
    *a
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)
    		*b
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


11.CHECK INSTRUMENT PANEL WIRE (SHORT)


    C234323E01

  1. Disconnect SST from connector B.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H72-19 (PAON) - H72-20 (P-AB)
    		Always
    		1 MΩ or higher

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


12.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    C234323E01

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H72-19 (PAON) - Body ground
    		Always
    		1 MΩ or higher
    H72-20 (P-AB) - Body ground
    		Always
    		1 MΩ or higher

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


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


    C234323E01

  1. Connect the cable to the negative (-) auxiliary battery terminal.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H72-19 (PAON) - Body ground
    		Power switch on (IG)
    		Below 1 V
    H72-20 (P-AB) - Body ground
    		Power switch on (IG)
    		Below 1 V

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


14.CHECK COMBINATION SWITCH ASSEMBLY (SOURCE VOLTAGE)


    C234323E02

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H72-8 (B) - Body ground
    		Power switch on (IG)
    		11 to 14 V

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector C
    *a
    		Front view of wire harness connector
    (to Combination Switch Assembly)



NG
REPLACE WIRE HARNESS OR AUXILIARY BATTERY
OK


15.CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    C145465E13

  1. Turn the power switch off.

  1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

  1. Connect the connector to the combination switch assembly.

  1. Connect the cable to the negative (-) auxiliary battery terminal.

  1. Turn the power switch on (IG).

  1. Check the indicator according to the conditions in the table below.

    OK:
    Terminal Connection
    		Switch Condition
    		Specified Condition
    H84-23 (PAON) - Body ground
    		Power switch on (IG)
    		"ON" comes on
    H84-17 (P-AB) - Body ground
    		Power switch on (IG)
    		"OFF" comes on

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire
    *4
    		Connector B
    *a
    		Front view of wire harness connector
    (to Airbag Sensor Assembly)



NG
REPLACE COMBINATION SWITCH ASSEMBLY (Click here)
OK


16.CHECK AIRBAG SENSOR ASSEMBLY


    C126705E01

  1. Turn the power switch off.

  1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

  1. Connect the connector to the airbag sensor assembly.

  1. Connect the cable to the negative (-) auxiliary battery terminal.

  1. Turn the power switch on (IG), and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the power switch off.

  1. Turn the power switch on (IG), and wait for at least 60 seconds.

  1. Check for DTCs (Click here).

    OK:
    DTC B1660/43 is not output.

    Text in Illustration 
    *1
    		Combination Switch Assembly
    *2
    		Airbag Sensor Assembly

    HINT:
    Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.



NG
REPLACE AIRBAG SENSOR ASSEMBLY (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)