B1863

SUPPLEMENTAL RESTRAINT SYSTEM: 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 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 the "check mode" (signal check) with the Techstream Check Mode Procedure.
- After selecting the "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 Check Mode Procedure.

PROCEDURE

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




(a) Turn the engine switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connector from the driver side knee airbag assembly.
(d) Connect SST (resistance 2.1 Ohms) to connector "C".
CAUTION:
Never connect a 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 the SST into the terminals of the connector when connecting.
- Insert straight the SST into the terminals of the connector.

SST: 09843-18061
(e) Connect the negative (-) terminal cable to the battery, 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 stored in the memory 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 the 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.

OK -- REPLACE DRIVER SIDE KNEE AIRBAG ASSEMBLY
NG -- Continue to next step.
2. CHECK CONNECTOR
(a) Turn the engine 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) 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, or the claw of the lock is not deformed or damaged.
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
3. CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE AIRBAG SQUIB CIRCUIT)




(a) Disconnect the connectors from the center airbag sensor assembly.
(b) Check for a short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(2) Turn the engine switch on (IG).
(3) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(c) Check for an open in the circuit.
(1) Turn the engine 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:





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





(e) 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 -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
4. CHECK CENTER AIRBAG SENSOR ASSEMBLY




(a) Connect the connectors to the driver side knee airbag assembly and the center airbag sensor assembly.
(b) Connect the negative (-) terminal cable to the battery, 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 stored in the memory 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 the 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