B1821

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1820-B1823; Short in Side Squib (RH) Circuit; 2013 MY FR-S [03/2012 -]
B1820 - Short in Side Squib (RH) Circuit
B1821 - Open in Side Squib (RH) Circuit
B1822 - Short in Side Squib (RH) Circuit (to Ground)
B1823 - Short in Side Squib (RH) Circuit (to +B)

DESCRIPTION

The front side squib RH circuit consists of the airbag ECU assembly and front seat airbag assembly RH.

The airbag ECU assembly uses this circuit to deploy the airbag when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the front side squib RH circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
After turning the ignition 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 Service Precautions.

HINT
* Perform the simulation method by selecting check mode (Signal Check) using the 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 road or rough road .

PROCEDURE

1. CHECK CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check that the connectors are properly connected to the front seat airbag assembly RH and airbag ECU assembly. Also check that the connectors that link the No. 2 floor wire and front seat wire RH 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 seat airbag assembly RH and airbag ECU assembly. Also disconnect the No. 2 floor wire from the front seat wire RH.

(e) Check that the terminals of the connectors are not damaged.

OK:

The terminals are not deformed or damaged.

(f) Check that the front seat wire RH connector (on the front seat airbag assembly RH side) is not damaged.

OK:

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

(g) Check that the short springs for the No. 2 floor wire and the front seat wire RH with the activation prevention mechanism are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

NG -- REPLACE WIRE HARNESS
OK -- Continue to next step.

2. CHECK FRONT SEAT AIRBAG ASSEMBLY RH (FRONT SIDE SQUIB RH)

(a) Connect the No. 2 floor wire to the front seat wire RH and airbag ECU assembly.

(b) Connect SST (resistance 2.1 Ohms) to connector E.

CAUTION:
Never connect the tester to the front seat airbag assembly RH (front side squib RH) 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 it.
* Insert SST straight into the terminals of the connector.

SST : 09843-18061

(c) Connect the cable to the negative (-) battery terminal.

(d) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1820, B1821, B1822 or B1823 is not output.

HINT
Codes other than DTCs B1820, B1821, B1822 and B1823 may be output at this time, but they are not related to this check.

(h) Turn the ignition switch off.

(i) Disconnect the cable from the negative (-) battery terminal.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(j) Disconnect SST from connector E.

NG -- CHECK FRONT SIDE SQUIB RH CIRCUIT

OK -- REPLACE FRONT SEAT AIRBAG ASSEMBLY RH Removal

3. CHECK FRONT SIDE SQUIB RH CIRCUIT

(a) Disconnect the No. 2 floor wire from the airbag ECU assembly.

(b) Check for a short to B+ in the circuit.

(1) Connect the cable to the negative (-) battery terminal.

(2) Turn the ignition switch to ON.

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

Standard Voltage:

(4) Turn the ignition switch off.

(5) Disconnect the cable from the negative (-) battery terminal.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check for an open in the circuit.

(1) 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:

(3) Restore the released activation prevention mechanism of connector B to the original condition.

NG -- CHECK NO. 2 FLOOR WIRE
OK -- Continue to next step.

4. CHECK DTC

(a) Connect the connectors to the front seat airbag assembly RH and airbag ECU assembly.

(b) Connect the cable to the negative (-) battery terminal.

(c) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the ignition switch off.

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1820, B1821, B1822 or B1823 is not output.

HINT
Codes other than DTCs B1820, B1821, B1822 and B1823 may be output at this time, but they are not related to this check.

NG -- REPLACE AIRBAG ECU ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK

5. CHECK NO. 2 FLOOR WIRE

(a) Disconnect the front seat wire RH from the No. 2 floor wire.

(4) Turn the ignition switch off.

(5) Disconnect the cable from the negative (-) battery terminal.

NOTICE:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(c) Check for an open in the circuit.

(1) 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:

(3) Restore the released activation prevention mechanism of connector B to the original condition.

NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

6. CHECK FRONT SEAT WIRE RH

(a) Check for a short to B+ in the circuit.

(1) Connect the cable to the negative (-) battery terminal.

(2) Turn the ignition switch to ON.

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

Standard Voltage:

(4) Turn the ignition switch off.

(5) Disconnect the cable from the negative (-) battery terminal.

NOTICE:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

(b) Check for an open in the circuit.

(1) 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:

(3) Restore the released activation prevention mechanism of connector D to the original condition.

NG -- REPLACE FRONT SEAT ASSEMBLY RH

OK -- USE SIMULATION METHOD TO CHECK