Mitsubishi Galant (2004+). Manual — part 1613
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-345
FAIL-SAFE FUNCTION
M1524003700021
If the SRS-ECU determines that the following parts
are defective, the SRS-ECU operates the SRS warn-
ing light and controls as follows.
• If the seat belt switch is defective, the SRS-ECU
determines that the seat belt is fastened and con-
trols the seat belt with pre-tensioner.
• If the seat slide sensor is defective, the SRS-ECU
determines that the seat is in its backward posi-
tion and controls the air bag.
• If the occupant classification sensor or the occu-
pant classification-ECU is defective, the
SRS-ECU determines that the occupant classifi-
cation is class 2 (The occupant classification sen-
sor detects 30 kg or more.) and controls the air
bag and the passenger’s air bag OFF indicator
light.
ACCURACY TESTING OF OCCUPANT CLASSIFICATION SENSOR
M1524025800015
The scan tool can be used to perform the next func-
tion.
• Seat Weight Sensor Accuacy Check
• Zero-calibration
SPECIAL TOOLS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-346
SPECIAL TOOLS
M1524000700453
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB990803
Steering wheel puller
General service tool
Steering wheel removal
MB991958
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826
Scan tool (MUT-III sub
assembly)
A: Vehicle
communication
interface (V. C. I.)
B: MUT-III USB cable
C: MUT-III main harness
A (Vehicles with CAN
communication
system)
D: MUT-III main harness
B (Vehicles without
CAN communication
system)
E: MUT-III main harness
C (For daymler
chrysler models only)
F: MUT-III measurement
adapter
G: MUT-III trigger
harness
MB991824-KIT
NOTE: G: MB991826
MUT-III Trigger
Harness is not
necessary when
pushing V.C.I. ENTER
key.
Checking diagnostic trouble code
CAUTION
For vehicles with CAN
communication, use MUT-III
main harness A to send
simulated vehicle speed. If you
connect MUT-III main harness
B instead, the CAN
communication does not
function correctly.
MB991865
Dummy resistor
SRS air bag and seat belt with
pre-tensioner circuit check
MB991866
Resistor harness
SRS air bag circuit check
MB990803AB
MB991910
MB991826
MB991958
MB991911
MB991914
MB991824
MB991827
MB991825
DO NOT USE
A
B
C
D
E
F
G
DO NOT USE
MB991865
MB991866
TEST EQUIPMENT
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-347
TEST EQUIPMENT
M1524000800256
SRS MAINTENANCE
M1524003900296
The SRS must be inspected by an authorized dealer up to 10
years after the date of vehicle registration. (Refer to GROUP
00, Maintenance Service
− SRS Maintenance
MB991884
Resistor harness (For
Pre-tensioner)
Seat belt with pre-tensioner
circuit check
MB991885
Pretensioner adapter
harness
• Deployment of seat belt with
pre-tensioner inside the
vehicle
• Deployment of seat belt with
pre-tensioner outside the
vehicle
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Test harness
B: LED harness
C: LED harness adapter
D: Probe
General service tools
Checking the continuity and
measuring the voltage at the
SRS-ECU harness connector
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991884
MB991885
MB991223
A
D
C
B
AG
TOOL
NAME
USE
Digital multi-meter
Use a multi-meter for which the maximum
test current is 2 mA or less at the minimum
range of resistance measurement
Checking the SRS electrical circuitry with
SRS check harness
AC000019AB
POST-COLLISION DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-348
POST-COLLISION DIAGNOSIS
M1524001100506
To inspect and service the SRS after a collision (whether or not
the air bags have deployed), perform the following steps.
SRS-ECU MEMORY CHECK
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector
(16-pin).
2. Read (and write down) all displayed diagnostic trouble
codes (Refer to
NOTE: If the battery power supply has been disconnected or
disrupted by the collision, scan tool MB991958 cannot com-
municate with the SRS-ECU. Check the battery, then check
and, if necessary, repair the front wiring harness and the
instrument panel wiring harness before proceeding.
3. Read the data list (fault duration and how many times
memories are erased), using scan tool MB991958.
Data list
4. Erase the diagnostic trouble codes, and then turn the
ignition switch to the LOCK (OFF) position.
5. Wait for at least one second, and then turn the ignition
switch to the ON position again.
6. After waiting 15 seconds or more, note all displayed
diagnostic trouble codes (Refer to
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
NO.
DATA LIST ITEM
APPLICABILITY
01
Failure continuation time 1
Maximum time to be stored: 9,999 minutes
(approximately seven days)
02
Failure continuation time 2
10
Elimination times
Maximum time to be stored: 255
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