Short in Driver Side Knee Airbag Squib Circuit - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1860/64: Short in Driver Side Knee Airbag Squib Circuit

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

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.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: To perform the simulation method, enter the "check mode (signal check) with the Techstream Check Mode Procedure, and then wiggle each connector of the airbag system or drive the vehicle on various type of road. Diagnosis System

PROCEDURE

1. CHECK DRIVER SIDE KNEE AIRBAG (DRIVER SIDE KNEE SQUIB)





(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect the connector from the driver side knee airbag.
(d) Connect the white wire side of SST (resistance: 2.1 Ohms) 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.
NOTICE:
- 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
(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Clear the DTCs. DTC Check / Clear
(h) Turn the engine switch off.
(i) Turn the engine switch on (IG), and wait for at least 60 seconds.
(j) Check for DTCs. DTC Check / Clear
OK:
DTC B1860, B1861, B1862 or B1863 is not output.
HINT: 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
OK -- REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY
2. CHECK CONNECTOR
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(c) Disconnect SST from connector C.
(d) 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 -- Continue to next step.
3. CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG CIRCUIT)





(a) Disconnect the connectors from the center airbag sensor.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





(d) Turn the engine switch off.
(e) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





(g) Release the activation prevention mechanism built into connector B. Diagnosis System
(h) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
4. CHECK CENTER AIRBAG SENSOR





(a) Connect the connectors to the driver side knee airbag and the center airbag sensor.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
(c) Turn the engine switch on (IG), and wait for at least 60 seconds.
(d) Clear the DTCs. DTC Check / Clear
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG), and wait for at least 60 seconds.
(g) Check for DTCs. DTC Check / Clear
OK:
DTC B1860, B1861, B1862 or B1863 is not output.
HINT: 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
OK -- USE SIMULATION METHOD TO CHECK