Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 682

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-55

STEP 2. Check the harness wires between SRS-ECU
connector C-74 and side impact sensor (RH) connector D-
02.
Q: Are the harness wires between SRS-ECU connector C-

74 and side impact sensor (RH) connector D-02 in good
condition?
YES : Go to Step 3.
NO : Repair them. Then go to Step 3.

STEP 3. Check for DTC.

Q: Is DTC 94 output?

YES : Replace the SRS-ECU. Refer to

P.52B-66

.

NO : This diagnosis is compleate.(If no malfunctions are

not found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to

Cope with Intermittent Malfunction

P.00-6

.)

AC000358AF

CONNECTOR: C-74

SRS-ECU

ACCELERATOR PEDAL

CENTER REINFORCEMENT (LH)

AC003136AB

CONNECTOR: D-02

<ECLIPSE>

<ECLIPSE SPYDER>

FRONT
SEAT BELT

FRONT OF
VEHICLE

REAR
SPEAKER

FRONT
SEAT BELT

FRONT OF
VEHICLE

REAR SPEAKER
BRACKET

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-56

SRS WARNING LIGHT CHECK

M1524004300060

1. Check that the SRS warning light illuminates when the

ignition switch is in the "ON" position.

2. Check that it illuminates for approximately 7 seconds and

then goes out.

3. If not, check for DTC.

AC000346AB

SRS WARNING LIGHT

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-57

SYMPTOM PROCEDURES

M1524010300047

INSPECTION PROCEDURE 1: Communication with scan tool MB991502 is not possible with the SRS
system only.

AC002969AB

SRS-ECU Power Supply Circuit

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-58

CIRCUIT OPERATION

•

The SRS-ECU is powered from the ignition
switch (IG1).

•

The SRS-ECU power is supplied from two
circuits. Even if one circuit is shut off, the air bag
can inflate.

•

The SRS system diagnosis can be done by
connecting scan tool MB991502 to the data link
connector.

•

The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors and the analog G-sensor. If the
impact is over a predetermined level, the SRS-
ECU outputs an ignition signal. At this time, if the
safing G-sensor is on, the SRS air bag will inflate.

TECHNICAL DESCRIPTION (COMMENT)

•

If communication is not possible with the SRS
only, the cause is probably an open circuit in the
on-board diagnostic output circuit of the SRS or
in the power circuit (including ground circuit).

TROUBLESHOOTING HINTS

•

Damaged wiring harnesses or connectors

•

Malfunction of the SRS-ECU

DIAGNOSIS

STEP 1. Check the ground line at the SRS-ECU connector
C-72 by backprobing.
(1) Do disconnect the connector C-72.
(2) Check the continuity between terminal 3 and the ground by

backprobing.

Q: Is the resistance between terminal 3 and ground less

than 2 ohm?
YES : Go to Step 3.
NO : Go to Step 2.

AC000358AD

SRS-ECU

ACCELERATOR PEDAL

CENTER REINFORCEMENT(LH)

CONNECTOR: C-72

AC000366AC

CONNECTOR: C-101, C-107

C-101

C-107

JUNCTION
BLOCK
(FRONT VIEW)

AC000800AC

CONNECTOR: C-29

COMBINATION METER

AC000368AC

C-72 CONNECTOR HARNESS SIDE VIEW