DTC B1871 [TYPE B]

id0802d5810100

System Malfunction Location

• 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 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

System Wiring Diagram

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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.
(See AIR BAG SYSTEM SERVICE WARNINGS.)

(See AIR BAG SYSTEM SERVICE CAUTIONS.)

•  Switch the Ignition to off.

•  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 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.)

2

INSPECT SAS CONTROL MODULE CONNECTOR

•  Remove the console. (See CONSOLE REMOVAL/INSTALLATION.)

•  Disconnect all SAS control module connector. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

•  Is there any malfunction of the SAS control module connector?

Yes

Repair the SAS control moudle 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

•  Inspect the wiring harness between SAS control module connector terminal 1C and PAD switch connector terminal D, SAS control module connector terminal 1H 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 wiring harness between the PAD switch and SAS control module.

4

INSPECT WIRING HARNESS BETWEEN PAD SWITCH AND BODY GROUND

•  Inspect the wiring harness between PAD switch connector terminal E and body ground.

Note

•  Inspect for continuity while shaking the wiring harness between the PAD switch and body ground.

•  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

•  Reconnect all disconnected connectors.

•  Connect the negative battery cable.

•  Switch the ignition to ON.

•  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TYPE B].)

•  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TYPE B].)

•  Are the same DTCs present?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

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. (See AIR BAG SYSTEM SERVICE WARNINGS.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) • Switch the Ignition to off. • 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 PAD switch. (See PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH INSPECTION.) • Is the PAD switch normal?	Yes	Go to the next step.
1		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 all SAS control module connector. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.) • Is there any malfunction of the SAS control module connector?	Yes	Repair the SAS control moudle wiring harness. After replacement, reperform the DTC inspection and verify that no DTCs are displayed.
2		No	Go to the next step.
3	INSPECT WIRING HARNESS BETWEEN PAD SWITCH AND SAS CONTROL MODULE • Inspect the wiring harness between SAS control module connector terminal 1C and PAD switch connector terminal D, SAS control module connector terminal 1H 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.
3		No	Replace the wiring harness between the PAD switch and SAS control module.
4	INSPECT WIRING HARNESS BETWEEN PAD SWITCH AND BODY GROUND • Inspect the wiring harness between PAD switch connector terminal E and body ground. Note • Inspect for continuity while shaking the wiring harness between the PAD switch and body ground. • Is the wiring harness normal?	Yes	Go to the next step.
4		No	Replace the wiring harness between the PAD switch and body ground.
5	PERFORM SAS CONTROL MODULE DTC INSPECTION • Reconnect all disconnected connectors. • Connect the negative battery cable. • Switch the ignition to ON. • Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TYPE B].) • Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TYPE B].) • Are the same DTCs present?	Yes	Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
5		No	DTC troubleshooting completed.