Lexus IS250 · Service Manual RESTRAINTS

B1660/43

Diagnostic trouble codes

DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the center airbag sensor assembly and the clock assembly.
The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag assembly and the front seat side airbag assembly (passenger side).
DTC B1660/43 is recorded when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.
DTC No.
 DTC Detecting Condition
 Trouble Area
B1660/43
  1. The center airbag sensor assembly 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.
  2. Passenger airbag ON/OFF indicator malfunction
  3. Center airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Clock assembly
  3. Center airbag sensor assembly

WIRING DIAGRAM

C123657E01

INSPECTION PROCEDURE


1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

  1. Turn the engine 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).

    H043700E06

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



B
Go to step 9
A


2. CHECK CONNECTION OF CONNECTORS

  1. Turn the engine switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the clock assembly.

    OK:
    The connectors are properly connected.



 NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3. CHECK PASSENGER AIRBAG ON / OFF INDICATOR

  1. Turn the engine switch off.

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

  1. Disconnect the connectors from the center airbag sensor assembly.

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

  1. Turn the engine 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 CENTER AIRBAG SENSOR ASSEMBLY

  1. C123656E01
    Connect the connectors to the center airbag sensor assembly and the clock assembly.

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

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

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

  1. Turn the engine switch off.

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

  1. Check for DTCs (Click here).

    OK:
    DTC B1660/43 is not output.

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



 NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

USE SIMULATION METHOD TO CHECK

5. CHECK INSTRUMENT PANEL WIRE (OPEN)

  1. C123658E01
    Turn the engine switch off.

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

  1. Disconnect the connector from the clock assembly.

  1. Using a service wire, connect J47-23 (PAON) and J47-17 (P-AB) of connector "B".

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

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

    Standard resistance:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - J53-9 (P-AB)
    		 Always
    		 Below 1 Ω
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - J54-7 (P-AB)
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


6. CHECK INSTRUMENT PANEL WIRE (SHORT)

  1. C123659E01
    Disconnect the service wire from connector "B".

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

    Standard resistance:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - J53-9 (P-AB)
    		 Always
    		 1 MΩ or higher
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - J54-7 (P-AB)
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


7. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

  1. C123659E01
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - Body ground
    		 Always
    		 1 MΩ or higher
    J53-9 (P-AB) - Body ground
    		 Always
    		 1 MΩ or higher
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - Body ground
    		 Always
    		 1 MΩ or higher
    J54-7 (P-AB) - Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


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

  1. C123659E01
    Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - Body ground
    		 Always
    		 Below 1 V
    J53-9 (P-AB) - Body ground
    		 Always
    		 Below 1 V
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - Body ground
    		 Always
    		 Below 1 V
    J54-7 (P-AB) - Body ground
    		 Always
    		 Below 1 V



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK

REPLACE CLOCK ASSEMBLY

9. CHECK CONNECTION OF CONNECTORS

  1. Turn the engine switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the clock assembly.

    OK:
    The connectors are properly connected.



 NG
CONNECT CONNECTORS
OK


10. CHECK INSTRUMENT PANEL WIRE (OPEN)

  1. C123658E01
    Turn the engine switch off.

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

  1. Disconnect the connectors from the center airbag sensor assembly and the clock assembly.

  1. Using a service wire, connect J47-23 (PAON) and J47-17 (P-AB) of connector "B".

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

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

    Standard resistance:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - J53-9 (P-AB)
    		 Always
    		 Below 1 Ω
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - J54-7 (P-AB)
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


11. CHECK INSTRUMENT PANEL WIRE (SHORT)

  1. C123659E01
    Disconnect the service wire from connector "B".

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

    Standard resistance:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - J53-9 (P-AB)
    		 Always
    		 1 MΩ or higher
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - J54-7 (P-AB)
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


12. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

  1. C123659E01
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - Body ground
    		 Always
    		 1 MΩ or higher
    J53-9 (P-AB) - Body ground
    		 Always
    		 1 MΩ or higher
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - Body ground
    		 Always
    		 1 MΩ or higher
    J54-7 (P-AB) - Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


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

  1. C123659E01
    Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-3 (PAON) - Body ground
    		 Engine switch on (IG)
    		 Below 1 V
    J53-9 (P-AB) - Body ground
    		 Engine switch on (IG)
    		 Below 1 V
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-6 (PAON) - Body ground
    		 Engine switch on (IG)
    		 Below 1 V
    J54-7 (P-AB) - Body ground
    		 Engine switch on (IG)
    		 Below 1 V



NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


14. CHECK CLOCK ASSEMBLY (SOURCE VOLTAGE)

  1. C123660E01
    Connect the connectors to the center airbag sensor assembly.

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

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    w/ Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J53-11 (IG+) -
    Body ground
    		 Engine switch on (IG)
    		 10 to 14 V
    w/o Navigation system:
    Tester connection
    		 Condition
    		 Specified condition
    J54-4 (IG+) - Body ground
    		 Engine switch on (IG)
    		 10 to 14 V



NG
REPAIR OR REPLACE WIRE HARNESS (CLOCK ASSEMBLY - BATTERY) OR BATTERY
OK


15. CHECK PASSENGER AIRBAG ON / OFF INDICATOR

  1. C123661E01
    Turn the engine switch off.

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

  1. Connect the connector to the clock assembly.

  1. Disconnect the connectors from the center airbag sensor assembly.

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

  1. Turn the engine switch on (IG).

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

    Result:
    Tester connection
    		 Condition
    		 Passenger airbag ON/OFF indicator
    J47-23 (PAON) - Body ground
    		 Engine switch on (IG)
    		 "ON" comes on
    J47-17 (P-AB) - Body ground
    		 Engine switch on (IG)
    		 "OFF" comes on



NG
REPLACE CLOCK ASSEMBLY
OK


16. CHECK CENTER AIRBAG SENSOR ASSEMBLY

  1. C123656E01
    Turn the engine switch off.

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

  1. Connect the connectors to the center airbag sensor assembly.

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

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

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

  1. Turn the engine switch off.

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

  1. Check for DTCs (Click here).

    OK:
    DTC B1660/43 is not output.

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



 NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK

USE SIMULATION METHOD TO CHECK


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