AIRBAG SYSTEM, Diagnostic DTC:B1860/64, B1861/64, B1862/64, B1863/64

DTC Code	DTC Name
B1860/64	Short in Driver Side Knee Airbag Squib Circuit
B1861/64	Open in Driver Side Knee Airbag Squib Circuit
B1862/64	Short to GND in Driver Side Knee Airbag Squib Circuit
B1863/64	Short to B+ in Driver Side Knee Airbag Squib Circuit

DESCRIPTION

The driver side knee airbag squib circuit consists of the center airbag sensor and the driver side knee airbag.

This circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the driver side knee airbag squib circuit.

DTC Code	DTC Detection Condition	Trouble Area
B1860/64	When one of the following conditions is met: The center airbag sensor receives a line short circuit signal 5 times in the driver side knee airbag squib circuit during the primary check. A driver side knee airbag squib malfunction. A center airbag sensor malfunction.	Instrument panel wire Driver side knee airbag assembly (Driver side knee squib) Center airbag sensor assembly
B1861/64	When one of the following conditions is met: The center airbag sensor receives an open circuit signal in the driver side knee airbag squib circuit for 2 seconds. A driver side knee airbag squib malfunction. A center airbag sensor malfunction.	Instrument panel wire Driver side knee airbag assembly (Driver side knee squib) Center airbag sensor assembly
B1862/64	When one of the following conditions is met: The airbag sensor center receives a short circuit to ground signal in the knee airbag (Driver side squib) circuit for 0.5 seconds. A driver side knee airbag squib malfunction. A center airbag sensor malfunction.	Instrument panel wire Driver side knee airbag assembly (Driver side knee squib) Center airbag sensor assembly
B1863/64	When one of the following conditions is met: The airbag sensor center receives a short circuit to B+ signal in the knee airbag (Driver side squib) circuit for 0.5 seconds. A driver side knee airbag squib malfunction. A center airbag sensor malfunction.	Instrument panel wire Driver side knee airbag assembly (Driver side knee squib) Center airbag sensor assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

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

Tech Tips

To perform the simulation method, enter the check mode (signal check) with the intelligent tester Click here, and then wiggle each connector of the airbag system or drive the vehicle on various type of road Click here.

PROCEDURE

CHECK DRIVER SIDE KNEE AIRBAG (DRIVER SIDE KNEE SQUIB)
1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the connector from the driver side knee airbag.
4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
  
  CAUTION:
  
  Never connect the tester to the driver side knee airbag (driver side knee squib) for measurement, as this may lead to a serious injury due to airbag deployment.
  Note
  - Do not forcibly insert SST into the terminals of the connector when connecting SST.
  - Insert SST straight into the terminals of the connector.
  SST
  
  09843-18061
5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
6. Turn the engine switch on (IG), and wait for at least 60 seconds.
7. Clear the DTCs Click here.
8. Turn the engine switch off.
9. Turn the engine switch on (IG), and wait for at least 60 seconds.
10. Check for DTCs Click here.
  
  OK
  
  DTC B1860, B1861, B1862 or B1863 is not output.
  
  Tech Tips
  
  Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.
NG
CHECK CONNECTOR Click here

OK

REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY Click here
CHECK CONNECTOR
1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect SST from connector C.
4. Check that the instrument panel wire connector (on the driver side knee airbag side) is not damaged.
  
  OK
  
  The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
NG
REPLACE INSTRUMENT PANEL WIRE

OK

OK
DTC B1860, B1861, B1862 or B1863 is not output.

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

CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG CIRCUIT)

Disconnect the connectors from 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

Tester Connection	Switch Condition	Specified Condition
E24-1 (DK+) - Body ground	Engine switch on (IG)	Below 1 V
E24-2 (DK-) - Body ground	Engine switch on (IG)	Below 1 V

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E24-1 (DK+) - E24-2 (DK-)	Always	Below 1 Ω

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E24-1 (DK+) - E24-2 (DK-)	Always	1 MΩ or higher
E24-1 (DK+) - Body ground	Always	1 MΩ or higher
E24-2 (DK-) - Body ground	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

CHECK CENTER AIRBAG SENSOR
1. Connect the connectors to the driver side knee airbag and the center airbag sensor.
2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Turn the engine switch on (IG), and wait for at least 60 seconds.
4. Clear the DTCs Click here.
5. Turn the engine switch off.
6. Turn the engine switch on (IG), and wait for at least 60 seconds.
7. Check for DTCs Click here.
  
  OK
  
  DTC B1860, B1861, B1862 or B1863 is not output.
  
  Tech Tips
  
  Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.
NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

OK

USE SIMULATION METHOD TO CHECK Click here