DTC B104D, B2226, B2227, B2856 [AIR BAG SYSTEM]

id0802a0004500

System Malfunction Location

DTC | System Malfunction Location
--- | ---
M-MDS display
B104D | Crash zone sensor assembly incorrect
B2226 | Crash zone sensor internal circuit disabled
B2227 | Crash zone sensor system communication error
B2856 | Crash zone sensor system communication data error

Detection Condition

  Warning
  • Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.

• The SAS control module detects an error of impact magnitude set in the sensor, which occurs due to installation mismatch of the crash zone sensor or side air bag sensors.
• Malfunction in the wiring harness between the crash zone sensor and SAS control module
• Malfunction in the crash zone sensor circuit

Possible Causes

• Crash zone sensor misinstalled with wrong sensor
• Crash zone sensor connector malfunction
• Open or short circuit in the wiring harness between the crash zone sensor and SAS control module
• Crash zone sensor malfunction
• SAS control module malfunction

System Wiring Diagram

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Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT CRASH ZONE SENSOR CONNECTOR Warning • Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable and wait for 1 min or more. (See BATTERY REMOVAL/INSTALLATION [L8, LF].) • Disconnect the crash zone sensor connector. (See CRASH ZONE SENSOR REMOVAL/INSTALLATION.) • Inspect the crash zone sensor connector. (Corrosion, damage, and disconnected pins) • Is there any malfunction of the crash zone sensor connector? | Yes | Replace the crash zone sensor wiring harness.
No | Go to the next step.
2 | INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND CRASH ZONE SENSOR • Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.) • Disconnect the clock spring connector. (See CLOCK SPRING REMOVAL/INSTALLATION.) • Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.) • Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.) • Disconnect the driver and passenger-side seat connectors. (See SEAT REMOVAL/INSTALLATION.) • Remove the back trim. (See BACK TRIM REMOVAL/INSTALLATION.) • Remove the driver and passenger-side pre-tensioner seat belt connectors. (See SEAT BELT REMOVAL/INSTALLATION.) • Remove the console panel. (See CONSOLE PANEL REMOVAL/INSTALLATION.) • Disconnect the SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.) • Inspect the wiring harnesses between SAS control module terminal 1E and crash zone sensor terminal A, SAS control module terminal 1B and crash zone sensor terminal B for the following: ― Short circuit between terminals ― Short to body ground ― Open circuit Note • Inspect for continuity while shaking the wiring harness between the SAS control module and crash zone sensor. • Is the wiring harness normal? | Yes | Go to the next step.
No | Replace the wiring harness between the SAS control module and the crash zone sensor.
3 | INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND CRASH ZONE SENSOR FOR A SHORT CIRCUIT TO THE POWER SUPPLY • Connect the negative battery cable. • Turn the ignition switch to the ON position with SAS control module and crash zone sensor connector disconnected. • Measure the voltage of SAS control module connector terminals 1B and 1E. Note • Measure the voltage while shaking the wiring harness between the SAS control module and crash zone sensor. • Is the voltage measured? | Yes | Replace the wiring harness between the SAS control module and the crash zone sensor.
No | Replace the crash zone sensor, then go to the next step. (See CRASH ZONE SENSOR REMOVAL/INSTALLATION.)
4 | PERFORM SAS CONTROL MODULE DTC INSPECTION • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable and wait for 1min or more. • Connect the crash zone sensor connector. • Connect the SAS control module connectors. • Connect the negative battery cable. • Turn the ignition switch to the ON position. • Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [AIR BAG SYSTEM].) • Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [AIR BAG SYSTEM].) • Are the same DTCs present? | Yes | Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No | DTC troubleshooting completed.