B1803

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1800/51-B1803/51:

B1803/51 - Short to B+ in Driver Side Squib Circuit

DESCRIPTION

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

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

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When installing the spiral cable and steering wheel, be sure to adjust the spiral cable as it may break if the steering wheel is turned before adjusting the spiral cable Installation.
* When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

HINT
To perform the simulation method, enter check mode (signal check) with the Techstream Check Mode Procedure, and then wiggle each connector of the airbag system or drive the vehicle on various types of road Diagnosis System.

PROCEDURE

1. CHECK STEERING PAD (DRIVER SIDE SQUIB)

(a) Turn the ignition switch off.





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

(c) Disconnect the connectors from the steering pad.

(d) Connect the white wire side of SST (resistance: 2.1 Ohms) to connector E (orange connector).

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 SST.
* Insert SST straight into the terminals of the connector.

SST : 09843-18061

(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

(g) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(h) Turn the ignition switch off.

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

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

OK:

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

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

Text in Illustration





NG -- CHECK CONNECTOR

OK -- REPLACE STEERING PAD Removal

2. CHECK CONNECTOR

(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 connectors from the center airbag sensor.

(e) Check that the connectors (on the center airbag sensor side and steering pad side) are not damaged.

OK:

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





Text in Illustration





NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal
OK -- Continue to next step.

3. CHECK DRIVER SIDE SQUIB CIRCUIT

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.





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

Standard Voltage:





(c) Turn the ignition switch off.

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

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(f) Release the activation prevention mechanism built into connector B Diagnosis System.

(g) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)
OK -- Continue to next step.

4. CHECK CENTER AIRBAG SENSOR

(a) Connect the connectors to the steering pad and center airbag sensor.





(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

(d) Clear the DTCs 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 B1800, B1801, B1802 or B1803 is not output.

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

Text in Illustration





NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

5. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)

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





(b) Disconnect the instrument panel wire connector from the spiral cable.

(c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

Standard Voltage:





(e) Turn the ignition switch off.

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

(g) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(h) Release the activation prevention mechanism built into connector B Diagnosis System.

(i) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPLACE INSTRUMENT PANEL WIRE

OK -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal