Mitsubishi Lancer Evolution 7. Manual — part 360
SRS -
Special Tools
52B-5
SPECIAL TOOLS
Tool
Number
Name
Use
MB991502
MUT-II sub
assembly
D
Reading and erasing diagnosis codes
D
Reading trouble period
D
Reading erase times
MB991865
Dummy resistor
Checking SRS air bag circuit
MB991866
Resistor harness
MB991613
SRS check
harness
Checking SRS electrical circuitry
A
B
C
D
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Check harness
B: LED harness
C: LED harness
adapter
D: Probe
Checking continuity and measuring voltage at
SRS-ECU harness connector
MB990803
Steering wheel
puller
Removing steering wheel
MR372530
SRS air bag
adapter harness
Deploying driver’s air bag module inside
vehicle
SRS -
Special Tools/Test Equipment/Troubleshooting
52B-6
Tool
Use
Name
Number
MB686560
SRS air bag
adapter harness
Deploying front passenger’s air bag module
inside or outside vehicle
MR203491or
MB628919
SRS air bag
adapter harness
Deploying driver’s air bag module inside
vehicle <RS>
TEST EQUIPMENT
Tool
Name
Use
Digital multi-meter
Checking SRS electrical circuitry
Use multi-meter for which the maximum test
current is 2 mA or less at minimum range of
resistance measurement
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.
DIAGNOSIS FUNCTION
DIAGNOSIS CODES CHECK
Connect the MUT-II to the diagnosis connector (16-pin) under the instrument under cover, then check
diagnosis codes.
(Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.)
ERASING DIAGNOSIS CODE
Connect the MUT-II to the diagnosis connector and erase the diagnosis code.
Caution
Turn off the ignition switch before connecting or disconnecting the MUT-II.
SRS WARNING LAMP CHECK
1. Check that the SRS warning lamp comes on when the
ignition switch is turned ON.
2. Check that the SRS warning lamp illuminates for about
7 seconds and then goes out.
3. If this is not the cause, check the diagnosis codes.
SRS warning lamp
SRS -
Troubleshooting
52B-7
SRS SYSTEM CIRCUIT DIAGRAM
Ignition switch (IG
1
)
J/B
(common fuse)
Combination
Meter
Connector lock switch*
ON
ON
OFF
OFF
Driver’s air
bag module
(squib)
Front pas-
senger’s seat
air bag mod-
ule(squib)
Seat belt
pre-tensioner
(L.H.)
Clock spring
ON
ON
OFF
OFF
Connector lock switch*
Diagnosis connector
SRS-ECU
No.3
7.5A
No.2
7.5A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
C-207
C-204
C-109
D-28
D-26
C-22
SRS-ECU connector
16
13
7
8
11
12
10
9
30
29
28
27
20
Connector lock switch*
Connector lock switch*
Connector lock switch*
Connector lock switch*
Connector lock switch*
NOTE
*:connector engaged:ON
connector disengaged:OFF
Seat belt
pre-tensioner
(R.H.)
SRS -
Troubleshooting
52B-8
CONNECTOR FOR SRS AIR BAG
The SRS air bag system connector is yellow or red.
To enhance system reliability, a connector lock switch is adopted for the SRS-ECU connector, and each
air bag module and clock spring connector, each seat belt with pre-tensioner <the connector A in the
following illustration (black)>).
A
Clock
spring
SRS-ECU
Driver’s air bag module
Front passenger’s air bag module
A
A
A
Driver’s seat belt pre-tensioner
Front passenger’s seat belt pre-tensioner
SQUIB CIRCUIT CONNECTOR LOCK SWITCH
Mechanism to automatically short-circuit the power supply terminal and the earth terminal of the air bag squib
circuit when the connector is disconnected. The short spring inside the connector allows to short-circuit the
power supply terminal and the earth terminal of the squib (no difference in voltage occurs between the
terminals) to prevent the squib from getting charged with static electricity.
CAUTION
When the connector is disconnected, it is normal for short-circuiting to occur between the connector
terminals.
When connector is connected
When connector is disconnected
OFF
ON
OFF
OFF
OFF
ON
ON
ON
ECU side connector
Harness side connector
<Connector lock switch structure (Example: SRS-ECU connector)>
A
A
Short spring
Partition panel
Terminal
(Female)
Terminal
(Male)
B
B
Section A - A
Section B - B
Partition
panel
Short spring
Terminal
(Female)
Terminal
(Male)
When connector is connected
Partition panel
Terminal
(Female)
Terminal
(Male)
Squib
Squib
SRS-ECU
SRS-ECU
Short spring
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