B1812

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1810-B1813; Short in D Squib (Dual Stage - 2nd Step) Circuit; 2013 MY FR-S [03/2012 -]
B1810 - Short in D Squib (Dual Stage - 2nd Step) Circuit
B1811 - Open in D Squib (Dual Stage - 2nd Step) Circuit
B1812 - Short in D Squib (Dual Stage - 2nd Step) Circuit (to Ground)
B1813 - Short in D Squib (Dual Stage - 2nd Step) Circuit (to +B)

DESCRIPTION

* The driver side squib 2nd step circuit consists of the airbag ECU assembly, spiral cable sub-assembly and horn button assembly.

* 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 driver side squib 2nd step 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 horn button assembly, spiral cable sub-assembly and airbag ECU 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 horn button assembly, spiral cable sub-assembly and airbag ECU assembly.

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

OK:

The terminals are not deformed or damaged.

(f) Check that the spiral cable sub-assembly connector (on the horn button assembly 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 instrument panel wire and spiral cable sub-assembly 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 HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB 2ND STEP)

(a) Connect the instrument panel wire to the airbag ECU assembly and spiral cable sub-assembly.

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

CAUTION:
Never connect the tester to the horn button assembly (driver 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 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 B1810, B1811, B1812 or B1813 is not output.

HINT
Codes other than DTCs B1810, B1811, B1812 and B1813 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 DRIVER SIDE SQUIB 2ND STEP CIRCUIT

OK -- REPLACE HORN BUTTON ASSEMBLY Removal

3. CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT

(a) Disconnect the instrument panel 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 INSTRUMENT PANEL WIRE
OK -- Continue to next step.

4. CHECK DTC

(a) Connect the connectors to the horn button assembly 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 B1810, B1811, B1812 or B1813 is not output.

HINT
Codes other than DTCs B1810, B1811, B1812 and B1813 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 INSTRUMENT PANEL WIRE

(a) Disconnect the instrument panel wire from spiral cable sub-assembly.

(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 INSTRUMENT PANEL WIRE
OK -- Continue to next step.

6. CHECK SPIRAL CABLE SUB-ASSEMBLY

(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.

CAUTION:
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 SPIRAL CABLE SUB-ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK