Mitsubishi Montero (2002-2004). Manual — part 817

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-137

DTC 82:Left Hand Side-Airbag Module (Squib) System Fault 2 (Open in the Squib Circuit)

.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is

by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU outputs an ignition
signal. At this time, if the side-airbag safing G-
sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag

module to inflate the side-airbag.

.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the side-airbag mod-
ule (LH) (squib).

.

TROUBLESHOOTING HINTS

• Open circuit in the left hand side-airbag module

(squib) circuit

• Improper connector contact

• Malfunction of the SRS-ECU

.

AC204439AB

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR

CONNECTED: ON
CONNECTOR

DISCONNECTED: OFF

Side-Airbag Module (LH) (Squib) Circuit

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204635 AB

CONNECTOR: F-15

F-15 (R)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-138

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-II)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the side-air bag module (LH).
(1) Disconnect the negative battery terminal.
(2) Disconnect the left hand side-airbag connector F-15.

(3) Connect special tool MB991865 to special tool MB991866.

CAUTION

Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(4) Insert special tool MB991866 into the F-15 harness

connector by backprobing.

(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and check the

diagnostic trouble code.

Q: Is DTC 82 set?

YES : Go to Step 2.
NO : Replace the seat back assembly of the front seat

(LH). (Refer to GROUP 52A, Front Seat

P.52A-13

.)

Then go to Step 3.

AC204635 AB

CONNECTOR: F-15

F-15 (R)

AC006042 AX

MB991866
(RESISTOR HARNESS)

F-15 HARNESS
CONNECTOR

F-15 SIDE-AIRBAG
MODULE (LH) CONNECTOR

MB991865 (DUMMY
RESISTOR: 3

Ω

)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-139

STEP 2. Check the harness for open circuit between the
SRS-ECU connector E-07 (terminal No.21 and 22) and the
left hand side-airbag module (LH) F-15 (terminal No.1 and
2).
(1) Disconnect SRS-ECU connector E-07.

(2) Disconnect S side-airbag module (LH) connector F-15.

CAUTION

Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(3) Check for continuity between the following terminals.

Between connector E-07 terminal 21 and connector F-15
terminal 1
Between connector E-07 terminal 22 and connector F-15
terminal 2
It should be less than 2 ohms.

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC 82 sets, replace
the SRS-ECU. (Refer to

P.52Ba-33

.) Then go to Step

3.

NO : Repair the harness wires between SRS-ECU

connector E-07 and side-airbag module (LH)
connector F-15. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code.
Q: Is DTC 82 set?

YES : Return to Step 1.
NO : The procedure 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

P.00-6

.)

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204635 AB

CONNECTOR: F-15

F-15 (R)

343536373839404142

252627282930313233

2122

2324

1 2

AC100387AG

F-15 HARNESS
CONNECTOR:
HARNESS SIDE

E-07 HARNESS
CONNECTOR:
HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-140

DTC 85:Left Hand Side-Airbag Module (Squib) System Fault Power Supply

Circuit (Short-Circuited to

Power Supply)

.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is

by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU outputs an ignition
signal. At this time, if the side-airbag safing G-
sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag

module to inflate the side-airbag.

.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the side-airbag mod-
ule (LH) (squib).

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Short to the power supply in the left hand side-

airbag module (squib) harness

• Malfunction of the SRS-ECU

.

AC204439AB

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR

CONNECTED: ON
CONNECTOR

DISCONNECTED: OFF

Side-Airbag Module (LH) (Squib) Circuit

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204635 AB

CONNECTOR: F-15

F-15 (R)