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B1860








SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1860/64-B1863/64: 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 assembly and the driver side knee airbag assembly.
This circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the driver side knee airbag squib circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- Perform the simulation method by selecting "check mode" (signal check) with Techstream Check Mode Procedure.
- 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 Diagnosis System.

PROCEDURE

1. CHECK CONNECTORS
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the driver side knee airbag assembly and center 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.
(d) Disconnect the connectors from the driver side knee airbag assembly and center airbag sensor assembly.
(e) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
(f) Check that the instrument panel wire connector (on the driver side knee airbag assembly 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.
2. CHECK DRIVER SIDE KNEE AIRBAG ASSEMBLY (DRIVER SIDE KNEE AIRBAG SQUIB)




(a) Connect the connector to the center airbag sensor assembly.
(b) Connect SST (resistance 2.1 Ohms) to connector C.
CAUTION: Never connect the tester to the driver side knee airbag assembly (driver side knee airbag 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.
- Insert SST straight into the terminals of the connector.

SST: 09843-18061
(c) Connect the negative (-) terminal cable to the battery.
(d) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory DTC Check / Clear.
(f) Turn the ignition switch off.
(g) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
OK:
DTC B1860, B1861, B1862, B1863, or 64 is not output.
HINT: Codes other than DTC B1860, B1861, B1862, B1863, and 64 may be output at this time, but they are not related to this check.

NG -- CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG SQUIB CIRCUIT)
OK -- REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY
3. CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG SQUIB CIRCUIT)




(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the SST from connector C.
(d) Disconnect the instrument panel wire from center airbag sensor assembly.
(e) Check for a short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery.
(2) Turn the ignition switch on (IG).
(3) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(f) Check for an open in the circuit.
(1) Turn the ignition switch off.
(2) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(3) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(g) Check for a short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(h) Check for a short in the circuit.
(1) Release the activation prevention mechanism built into connector B Diagnosis System.
(2) 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 ASSEMBLY




(a) Restore the released activation prevention mechanism of connector B to the original condition.
(b) Connect the connectors to the driver side knee airbag assembly and the center airbag sensor assembly.
(c) Connect the negative (-) terminal cable to the battery.
(d) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(e) Clear the stored DTCs in the memory DTC Check / Clear.
(f) Turn the ignition switch off.
(g) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
OK:
DTC B1860, B1861, B1862, B1863, or 64 is not output.
HINT: Codes other than DTC B1860, B1861, B1862, B1863, and 64 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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