DTC B1871 [AIR BAG SYSTEM]

id0802a0810100

System Malfunction Location

DTC | System Malfunction Location
--- | ---
M-MDS display
B1871 | Passenger air bag deactivation (PAD) switch system circuit disabled

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.

• Malfunction in wiring harness between PAD switch and SAS control module
• Malfunction in PAD switch circuit

Possible Causes

• PAD switch connector malfunction
• PAD switch assembly incorrect
• Open or short circuit in wiring harness between PAD switch and SAS control module
• Open circuit in wiring harness between PAD switch and body ground
• SAS control module malfunction

System Wiring Diagram

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Diagnostic Procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT PAD SWITCH 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. • Remove the battery cover. • Disconnect the negative battery cable and wait for 1 min or more. (See BATTERY REMOVAL/INSTALLATION [L8, LF].) • Disconnect the PAD switch connector. • Inspect the PAD switch connection. (Corrosion, damage, and disconnected pins) • Is there any malfunction of the PAD switch connector? | Yes | Replace the PAD switch wiring harness.
No | Go to the next step.
2 | INSPECT PAD SWITCH • Inspect the PAD switch. (See PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH INSPECTION.) • Is the PAD switch normal? | Yes | Go to the next step.
No | Replace the PAD switch. (See PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH REMOVAL/INSTALLATION.)
3 | INSPECT WIRING HARNESS BETWEEN PAD SWITCH AND SAS CONTROL MODULE • 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 harness between SAS control module terminal 1Q and PAD switch terminal D, SAS control module terminal 1H and PAD switch terminal C 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 PAD switch. • Is the wiring harness normal? | Yes | Go to the next step.
No | Replace the wiring harness between the SAS control module and the PAD switch.
4 | INSPECT WIRING HARNESS BETWEEN PAD SWITCH AND BODY GROUND • Inspect the wiring harness between PAD switch terminal E and body ground for the following: ― Open circuit Note • Inspect for continuity while shaking the wiring harness between the SAS control module and PAD switch. • Is the wiring harness normal? | Yes | Go to the next step.
No | Replace the wiring harness between the PAD switch and body ground.
5 | 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. • Reconnect all disconnected 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.