DTC    B1860/64    Short in Driver Side Knee Airbag Squib Circuit

DTC    B1861/64    Open in Driver Side Knee Airbag Squib Circuit

DTC    B1862/64    Short to GND in Driver Side Knee Airbag Squib Circuit

DTC    B1863/64    Short to B+ in Driver Side Knee Airbag Squib Circuit

for Preparation Click here


DESCRIPTION

The driver side knee airbag squib circuit consists of the airbag sensor assembly and lower No. 1 instrument panel airbag assembly.
The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the driver side knee airbag squib circuit.

DTC No.
DTC Detection Condition
Trouble Area
B1860/64
  1. The airbag sensor assembly receives a line short circuit signal in the driver side knee airbag squib circuit during primary check.
  2. Driver side knee airbag squib malfunction
  3. Airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Lower No. 1 instrument panel airbag assembly (Driver side knee airbag squib)
  3. Airbag sensor assembly
B1861/64
  1. The airbag sensor assembly receives an open circuit signal in the driver side knee airbag squib circuit.
  2. Driver side knee airbag squib malfunction
  3. Airbag sensor assembly malfunction
B1862/64
  1. The airbag sensor assembly receives a short circuit to ground signal in the driver side knee airbag squib circuit.
  2. Driver side knee airbag squib malfunction
  3. Airbag sensor assembly malfunction
B1863/64
  1. The airbag sensor assembly receives a short circuit to B+ signal in the driver side knee airbag squib circuit.
  2. Driver side knee airbag squib malfunction
  3. Airbag sensor assembly malfunction

WIRING DIAGRAM


C198980E69


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).

HINT:
  1. Perform the simulation method by selecting check mode (Signal Check) using the intelligent tester (Click here).
  2. After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road (Click here).

1.CHECK CONNECTORS


    C167985E10

  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 lower No. 1 instrument panel airbag assembly and airbag sensor 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 lower No. 1 instrument panel airbag assembly and airbag sensor assembly.

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

    OK:
    The terminals are not deformed or damaged.

  1. Check that the instrument panel wire connector (on the lower No. 1 instrument panel airbag assembly side) is not damaged.

    OK:
    The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

  1. Check that the short spring for the instrument panel wire with the activation prevention mechanism are not deformed or damaged.

    OK:
    The short spring is not deformed or damaged.

    Text in Illustration 
    *1
    		Lower No. 1 Instrument Panel Airbag Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Instrument Panel Wire



NG
REPLACE INSTRUMENT PANEL WIRE
OK


2.CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (DRIVER SIDE KNEE AIRBAG SQUIB)
C234992E01

  1. Connect the connector to the airbag sensor assembly.

  1. Connect SST (resistance 2.1 Ω) to connector C.

    CAUTION:
    Never connect the tester to the lower No. 1 instrument panel airbag assembly (driver side knee airbag squib) for measurement, as this may lead to a serious injury due to airbag deployment.

    NOTICE:
    1. Do not forcibly insert SST into the terminals of the connector when connecting.
    2. Insert SST straight into the terminals of the connector.

SST
09843-18061  

  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 B1860/64, B1861/64, B1862/64 or B1863/64 is not output.

    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *1
    		Lower No. 1 Instrument Panel Airbag Assembly
    *2
    		Airbag Sensor Assembly
    *3
    		Connector C
    *a
    		Front view of wire harness connector
    (to Lower No. 1 Instrument Panel Airbag Assembly)

    HINT:
    Codes other than DTCs B1860/64, B1861/64, B1862/64 and B1863/64 may be output at this time, but they are not related to this check.



NG
Go to step 3
OK

REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (Click here)  

3.CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG SQUIB CIRCUIT)


    C234993E01

  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. Disconnect SST from connector C.

  1. Disconnect the instrument panel wire from the airbag sensor assembly.

  1. Check for a short to B+ in the circuit.

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

    2. Turn the power switch on (IG).

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

      Standard Voltage:
      for LHD 
      Tester Connection
      		Switch Condition
      		Specified Condition
      H32-1 (DK+) - Body ground
      		Power switch on (IG)
      		Below 1 V
      H32-2 (DK-) - Body ground
      		Power switch on (IG)
      		Below 1 V
      for RHD 
      Tester Connection
      		Switch Condition
      		Specified Condition
      H139-1 (DK+) - Body ground
      		Power switch on (IG)
      		Below 1 V
      H139-2 (DK-) - Body ground
      		Power switch on (IG)
      		Below 1 V

  1. Check for an open in the circuit.

    1. Turn the power switch off.

    2. 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.

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

      Standard Resistance:
      for LHD 
      Tester Connection
      		Condition
      		Specified Condition
      H32-1 (DK+) - H32-2 (DK-)
      		Always
      		Below 1 Ω
      for RHD 
      Tester Connection
      		Condition
      		Specified Condition
      H139-1 (DK+) - H139-2 (DK-)
      		Always
      		Below 1 Ω

  1. Check for a short to ground in the circuit.

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

      Standard Resistance:
      for LHD 
      Tester Connection
      		Condition
      		Specified Condition
      H32-1 (DK+) - Body ground
      		Always
      		1 MΩ or higher
      H32-2 (DK-) - Body ground
      		Always
      		1 MΩ or higher
      for RHD 
      Tester Connection
      		Condition
      		Specified Condition
      H139-1 (DK+) - Body ground
      		Always
      		1 MΩ or higher
      H139-2 (DK-) - Body ground
      		Always
      		1 MΩ or higher

  1. Check for a short in the circuit.

    1. Release the activation prevention mechanism built into connector B (Click here).

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

      Standard Resistance:
      for LHD 
      Tester Connection
      		Condition
      		Specified Condition
      H32-1 (DK+) - H32-2 (DK-)
      		Always
      		1 MΩ or higher
      for RHD 
      Tester Connection
      		Condition
      		Specified Condition
      H139-1 (DK+) - H139-2 (DK-)
      		Always
      		1 MΩ or higher

      Text in Illustration 
      *A
      		for LHD
      *B
      		for RHD
      *1
      		Lower No. 1 Instrument Panel Airbag Assembly
      *2
      		Airbag Sensor Assembly
      *3
      		Instrument Panel Wire
      *4
      		Connector C
      *a
      		Front view of wire harness connector
      (to Lower No. 1 Instrument Panel Airbag Assembly)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


4.CHECK AIRBAG SENSOR ASSEMBLY


    C189113E02

  1. Restore the released activation prevention mechanism of connector B to the original condition.

  1. Connect the connectors to the lower No. 1 instrument panel airbag assembly and 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 B1860/64, B1861/64, B1862/64 or B1863/64 is not output.

    Text in Illustration 
    *1
    		Lower No. 1 Instrument Panel Airbag Assembly
    *2
    		Airbag Sensor Assembly

    HINT:
    Codes other than DTCs B1860/64, B1861/64, B1862/64 and B1863/64 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)