B1511

DTC Description

The Seat Belt Buckle Switch (BS) circuit consists of the SRSCM and two BS. The SRSCM sets above DTC(s) if it detects open or short to battery line on the BS circuit. This system decides whether the driver or passenger seat belt is buckled or not.

DTC Detecting Condition





Specification





Schematic Diagram





Terminal & Connector Inspection

Refer to the DESCRIPTION in this TROUBLESHOOTING section.

Inspection Procedure

1. PREPARATION
Refer to the DESCRIPTION in this TROUBLESHOOTING section.
2. CHECK OPEN CIRCUIT
(1) Disconnect the BS connector.
(2) Measure resistance between the terminal 3 of BS harness connector and the terminal 25(26) of SRSCM harness connector (B).

specification (Resistance) : below 1 Ohms





(3) Is the measured resistance within specification?
YES
> Go to next step.
NO
> Repair or replace the wiring harness between the BS and the SRSCM.
3. CHECK SHORT TO BATTERY LINE
(1) Connect the battery negative cable to the battery.
(2) Turn the ignition switch to ON.
(3) Measure voltage between the terminal 3 of BS harness connector and chassis ground.

specification (voltage) : Approximately 0 V





(4) Is the measured voltage within specification?
YES
> Check the Seat belt buckle switch(BS).
NO
> Repair the short to battery line circuit on wiring harness between the BS and the SRSCM.
4. CHECK THE SEAT BELT BUCKLE SWITCH (BS)
(1) Measure current between the terminal 3 of BS and 25(26) of SRSCM harness connector(B).

specification (current) : 12 - 18 mA (Buckled status), 4 - 7 mA (Unbuckled status)


(2) Is the measured current within specification?
YES
> Go to next step.
NO
> Replace the BS.
5. CLEAR THE DTC AND CHECK THE VEHICLE AGAIN
Refer to the DESCRIPTION in this TROUBLESHOOTING section.