Mitsubishi Galant. Manual — part 596

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM(SRS)

52B-25

STEP 4. Check the harness wires between SRS-ECU
connector C-44 and clock spring connector C-62.
Q: Are the harness wires between SRS-ECU connector C-

44 and clock spring connector C-62 in good condition?
YES : Go to Step 5.
NO : Repair the harness wires between SRS-ECU

connector C-44 and clock spring connector C-62.
Then go to Step 5.

STEP 5. Check the DTC.

Q: Is any of DTC 21, 22, 61 or 62 output?

YES : Return to Step 1.
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.)

AC003195AB

CONNECTOR: C-44

SRS-ECU

CENTER
REINFORCEMENT

AC003198AB

CONNECTOR: C-62

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM(SRS)

52B-26

DTC 24: Passenger (front) side-air bag module (squib) system fault 1
DTC 25: Passenger (front) side-air bag module (squib) system fault 2
DTC 64: Passenger (front) side-air bag module (squib) system fault for power supply circuit
DTC 65: Passenger (front) side-air bag module (squib) system fault for ground circuit

CIRCUIT OPERATION

•

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.

•

The ignition signal is input to the air bag module
to inflate the air bag.

DTC SET CONDITIONS

•

These DTC are output if there is abnormal
resistance between the input terminals of the
front passenger's side air bag module (squib).
The most likely causes for this code to be set are
shown in the table below: However, if no DTC
resets, the SRS warning light will be switched off
(The DTC will be retained).

TROUBLESHOOTING HINTS

•

Damaged wiring harnesses or connectors

•

Malfunction of the front passenger's side air bag
module (squib)

•

Malfunction of the SRS-ECU

AC002975AB

Front Passenger's Side Air Bag Module (Squib) Circuit

AC003195AB

CONNECTOR: C-44

SRS-ECU

CENTER
REINFORCEMENT

AC003199AB

CONNECTOR: C-09

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM(SRS)

52B-27

DIAGNOSIS

Required Special Tools:

•

MB991502: Scan Tool (MUT-II)

•

MB991613: SRS Check Harness

STEP 1. Check the front passenger's side air bag module
line using the scan tool and MB991613 SRS Check
harness.
(1)Disconnect front passenger's side air bag module

connector C-09.

(2)Connect special tool MB991613 connector (1).
(3)Connect the negative battery terminal.
(4)Erase the diagnostic trouble code memory.

Q: Is the DTC output?

YES : Go to Step 2.
NO : Replace the front passenger's side air bag module.

Refer to

P.52B-67

. Then go to Step 3.

CODE NO.

SYMPTOMS

24

•

Short circuit in front passenger's side air bag module (squib) or harness

25

•

Open circuit in front passenger's side air bag module (squib) or harness

•

Malfunction of connector contact

64

•

Short circuit in front passenger's side air bag module (squib) harness leading to
the power supply

65

•

Short circuit in front passenger's side air bag module (squib) harness leading to
the ground

AC003200AB

1

C-09

MB991613

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM(SRS)

52B-28

STEP 2. Check the harness wires between SRS-ECU
connector C-44 and front passenger's side air bag module
connector C-09.
Q: Are the harness wires between SRS-ECU connector C-

44 and front passenger's side air bag module connector
C-09 in good condition?
YES : Go to Step 3.
NO : Repair them. Then go to Step 3.

STEP 3. Check for DTC.

Q: Is any of DTC 24, 25, 64 or 65 output?

YES : Replace the SRS-ECU. Refer to

P.52B-65

.

NO : This diagnosis is complete.(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.)

DTC 34: Connector lock system detects connector unlocked

DTC SET CONDITIONS

•

This DTC is output if a poor connection at the
SRS-ECU is detected. However, if the vehicle
condition returns to normal, DTC number 34 will
be automatically erased, and the SRS warning
light will go out.

TROUBLESHOOTING HINTS

•

Damaged connectors

•

Malfunction of the SRS-ECU

AC003195AB

CONNECTOR: C-44

SRS-ECU

CENTER
REINFORCEMENT

AC003199AB

CONNECTOR: C-09