B2507

DTC Description

The Telltale Lamp circuit consists of the Telltale Lamp and the SRSCM. SRSCM sets the above DTC if the Telltale Lamp failure is detected.

DTC Detecting Condition





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 THE FUSE
(1) Remove the airbag fuse and the airbag telltale lamp fuse from junction block.
(2) Inspect the fuses. Are the fuses normal?
YES
> Check the telltale lamp bulb.
NO
> Repair or replace the fuses.
3. CHECK THE TELLTALE LAMP BULB
(1) Remove the bulb from the instrument cluster.
(2) Inspect the bulb. Is the bulb normal?
YES
>Check source voltage.
NO
> Repair or replace the bulb.
4. CHECK SOURCE VOLTAGE
(1) Connect the battery negative cable to the battery.
(2) Turn the ignition switch to ON.
(3) Measure voltage between the terminal 1 of the Telltale Lamp harness connector and chassis ground.

specification(voltage) : 9 - 16 V





(4) Is the measured voltage within specification?
YES
>Check short to battery line.
NO
>Repair or replace the wiring harness between ignition switch and the Telltale Lamp.
5. CHECK SHORT TO BATTERY LINE
(1) Measure voltage between the terminal 2 of the Telltale Lamp harness connector and chassis ground.

specification(voltage) : Approximately 0 V





(2) Is the measured voltage within specification?
YES
> Check short or short to ground.
NO
> Repair the short to battery line circuit on wiring harness between the SRSCM and the Telltale Lamp.
6. CHECK SHORT OR SHORT TO GROUND
(1) Turn the ignition switch to LOCK.
(2) Disconnect the battery negative cable from the battery.
(3) Measure resistance between the terminal 2 of the Telltale Lamp harness connector and chassis ground.
(4) Measure resistance between the terminal 1 and 2 of the Telltale Lamp harness connector.

specification(resistance) : infinite





(5) Is the measured resistance within specification?
YES
>Check open circuit.
NO
> Repair the short or short to ground circuit on wiring harness between the SRSCM and the Telltale Lamp.
7. CHECK OPEN CIRCUIT
(1) Measure resistance between the terminal 2 of the Telltale Lamp harness connector and the terminal 19(A) of SRSCM harness connector.

specification(resistance) : below 1 Ohms





(2) Is the measured resistance within specification?
YES
> Go to next step.
NO
> Repair the open circuit on wiring harness between the SRSCM and the Telltale Lamp.
8. CLEAR THE DTC AND CHECK THE VEHICLE AGAIN
Refer to the DESCRIPTION in this TROUBLESHOOTING section.