DTC B1871

id080200810100

DTC 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 CAUSE
•  PAD switch assembly incorrect
•  SAS control module connector malfunction
•  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

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT PAD SWITCH
Warning
•  Handling the air bag system components improperly can accidentally operate (deploy) the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the service warnings and cautions before handling the air bag system components.
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the PAD switch. (See PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH REMOVAL/INSTALLATION.)
•  Inspect the hazard warning 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.)
2
INSPECT SAS CONTROL MODULE CONNECTOR
•  Remove the console. (See CONSOLE REMOVAL/INSTALLATION.)
•  Disconnect the SAS control module connector. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
•  Is there any malfunction of the SAS control module connector?
Yes
Repair or replace the wiring harness.
After replacement, reperform the DTC inspection and verify that no DTCs are displayed.
No
Go to the next step.
3
INSPECT WIRING HARNESS BETWEEN PAD SWITCH AND SAS CONTROL MODULE
•  Disconnect the PAD switch connector.
•  Inspect the wiring harness between SAS control module connector terminal 1H and PAD switch connector terminal D, SAS control module connector terminal 1I and PAD switch connector terminal C for the following:
―  Short to ground
―  Open circuit
―  Short circuit between terminals
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 air bag wiring harness.
4
INSPECT WIRING HARNESS BETWEEN PAD SWITCH AND BODY GROUND
•  Is there continuity between terminal E of PAD switch connector and body ground?
Note
•  Inspect for continuity while shaking the wiring harness between the SAS control module and PAD switch.
Yes
Go to the next step.
No
Replace the air bag wiring harness.
5
PERFORM DTC INSPECTION
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Connect the PAD switch connector.
•  Connect the SAS control module connectors.
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Clear DTCs using the M-MDS.
(See CLEARING DTC.)
•  Perform the DTC inspection for the SAS control module using the M-MDS.
•  Are DTCs B1871 displayed?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.