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B1802





SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1800/51-B1803/51: Short in Driver Side Squib Circuit


DESCRIPTION

* The driver side squib circuit consists of the center airbag sensor assembly, spiral cable and steering pad.

* The circuit instructs SRS to deploy when deployment conditions are met.

* These DTCs are recorded when a malfunction is detected in the driver side squib circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
- Perform the simulation method by selecting the check mode (Signal Check) using 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 How To Proceed With Troubleshooting.

PROCEDURE

1. CHECK CONNECTORS

(a) Turn the ignition switch off.





(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Check that the connectors are properly connected to the steering pad, spiral cable 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 steering pad, spiral cable 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 spiral cable connector (on the steering pad 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 with the activation prevention mechanism are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

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

2. CHECK STEERING PAD (DRIVER SIDE SQUIB)

(a) Connect the instrument panel wire to the center airbag sensor assembly and spiral cable.





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

CAUTION:
Never connect the tester to the steering pad (driver side 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 cable to the negative (-) battery terminal.

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

(h) Check for DTCs DTC Check / Clear.

OK:

DTC B1800, B1801, B1802, B1803 or 51 is not output.

Text in Illustration

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HINT
Codes other than DTC B1800, B1801, B1802, B1803 and 51 may be output at this time, but they are not related to this check.

NG -- CHECK DRIVER SIDE SQUIB CIRCUIT

OK -- REPLACE STEERING PAD Removal

3. CHECK DRIVER SIDE SQUIB CIRCUIT

(a) Turn the ignition switch off.





(b) Disconnect the cable from the negative (-) battery terminal, 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 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:





(f) Check for an open in the circuit.

(1) Turn the ignition switch off.

(2) Disconnect the cable from the negative (-) battery terminal, 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:





Text in Illustration

Text in Illustration:





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 steering pad and center airbag sensor assembly.

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

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

(h) Check for DTCs DTC Check / Clear.

OK:

DTC B1800, B1801, B1802, B1803 or 51 is not output.

Text in Illustration

Text in Illustration:





HINT
Codes other than DTC B1800, B1801, B1802, B1803 and 51 may be output at this time, but they are not related to this check.

NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

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 from the spiral cable.

(c) 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:





(d) Check for an open in the circuit.

(1) Turn the ignition switch off.

(2) Disconnect the cable from the negative (-) battery terminal, 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:





Text in Illustration

Text in Illustration:





NG -- REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.

6. CHECK SPIRAL CABLE

(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:





(b) Check for an open in the circuit.

(1) Turn the ignition switch off.

(2) Disconnect the cable from the negative (-) battery terminal, 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:





Text in Illustration

Text in Illustration:





NG -- REPLACE SPIRAL CABLE Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
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