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DTC 54








SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1815/54-B1818/54: Short in Front Passenger Side Squib 2nd Step Circuit

DTC B1815/54 - Short in Front Passenger Side Squib 2nd Step Circuit

DTC B1816/54 - Open in Front Passenger Side Squib 2nd Step Circuit

DTC B1817/54 - Short to GND in Front Passenger Side Squib 2nd Step Circuit

DTC B1818/54 - Short to B+ in Front Passenger Side Squib 2nd Step Circuit

DESCRIPTION

The front passenger side squib 2nd step circuit consists of the center airbag sensor assembly and the front passenger airbag assembly.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the front passenger side squib 2nd step 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 front passenger airbag assembly and center airbag sensor assembly. Also check that the connectors that link the instrument panel wire assembly and instrument panel wire are properly connected.
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 front passenger airbag assembly and center airbag sensor assembly. Also disconnect the instrument panel wire from the instrument panel wire assembly.
(e) Check that the connectors of the terminals are not damaged.
OK:
The terminals are not deformed or damaged.
(f) Check that the instrument panel wire assembly connector (on the front passenger 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 WIRE HARNESS
OK -- Continue to next step.
2. CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP)




(a) Connect the instrument panel wire to the instrument panel wire assembly and center airbag sensor assembly.
(b) Connect SST (resistance 2.1 Ohms) to connector E (black connector).
CAUTION: Never connect the tester to the front passenger airbag assembly (front passenger side squib 2nd step) 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 B1815, B1816, B1817, B1818, or 54 is not output.
HINT: Codes other than DTC B1815, B1816, B1817, B1818, and 54 may be output at this time, but they are not related to this check.

NG -- CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT
OK -- REPLACE FRONT PASSENGER AIRBAG ASSEMBLY
3. CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP 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 SST from connector E.
(d) Disconnect the instrument panel wire from the 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 -- CHECK 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 front passenger 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 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 B1815, B1816, B1817, B1818, or 54 is not output.
HINT: Codes other than DTC B1815, B1816, B1817, B1818, and 54 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
5. CHECK INSTRUMENT PANEL WIRE




(a) Restore the released activation prevention mechanism of connector B to the original condition.
(b) Disconnect the instrument panel wire assembly from the instrument panel wire.
(c) 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:





(d) 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:





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





(f) 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.
6. CHECK INSTRUMENT PANEL WIRE ASSEMBLY




(a) 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:





(b) 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:





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





(d) Check for a short in the circuit.
(1) Release the activation prevention mechanism built into connector D Diagnosis System.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE INSTRUMENT PANEL WIRE ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK
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