1999 MITSUBISHI LANCER EVOLUTION VI lock

SRS – SRS Service Precautions52B-4
SRS-ECU
terminal No.Harness connector
(No. of terminals,
colour)Destination of harnessCorrective action
1 to 421 pins, yellow––
5Body wiring harness → Clock spring → Air bag
module (Driver’s side)
Correct or replace each
wiring harness Replace
6
module (Driver’s side)wiring harness. Replace
clock spring.
7*Body wiring harness → Air bag module (Front
passenger’s side)
Correct or replace each
wiring harness
8*
passenger’s side)wiring harness.
9,10––
11Body wiring harness → Diagnosis connectorCorrect or replace each
wiring harness.
12––
13Body wiring harness → Junction block (fuse No.2)Correct or replace each
wiring harness
14Body wiring harness → Junction block (fuse No.4)
wiring harness.
15Body wiring harness → SRS warning lamp
16 to 19––
20Body wiring harness → EarthCorrect or replace each
wiring harness.
21––
NOTE
*: Vehicles with front passenger’s air bag
6. SRS components should not be subjected to hear over 93C, so remove the SRS-ECU, air bag
module and clock spring before drying or baking the vehicle after painting.
7. Whenever you finish servicing the SRS, check warning lamp operation to make sure that the system
functions properly. (Refer to P.52B-14.)
8. Make certain that the ignition switch is LOCK (OFF) position when the MUT-II is connected or
disconnected.
9. If you have any questions about the SRS, please contact your local distributor.
NOTE
SERIOUS INJURY CAN RESULT FROM UNINTENDED AIR BAG DEPLOYMENT, SO USE ONLY
THE PROCEDURES AND EQUIPMENT SPECIFIED IN THIS MANUAL.

SRS – Troubleshooting52B-6
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 CODES
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.
INSPECTION CHART FOR DIAGNOSIS CODES
Inspect according to the inspection chart that is appropriate for the malfunction code.
Code No.Diagnosis itemReference page
14Analog G-sensor system in the SRS-ECU52B-7
15,16Safing G-sensor system in the SRS-ECU52B-7
21, 22, 61, 62Driver’s side air bag module (squib) system52B-8
24, 25, 64, 65Front passenger’s side air bag module (squib) system52B-9
31, 32SRS-ECU capacitor system52B-9
34*Connector lock system52B-10
35SRS-ECU (deployed air bag) system52B-10
41*IG1 (A) power circuit system52B-10
42*IG1 (B) power circuit system52B-11
43SRS warning lamp drive circuit
system
Lamp does not illuminate.*52B-12
systemLamp does not switch off.52B-12
44SRS warning lamp drive circuit system52B-13
45SRS-ECU non-volatile memory (EEPROM) and A/D converter system52B-13
51, 52Driver’s side air bag module (squib ignition drive circuit) system52B-13
54, 55Front passenger’s side air bag module (squib ignition drive circuit) system52B-13
NOTE
(1) *: If the vehicle condition returns to normal, the diagnosis code will be automatically erased, and the SRS warning
lamp will return to normal.
(2) If the vehicle has a discharged battery it will store the fault codes 41 or 42. When these diagnosis codes are
displayed, check the battery.

SRS – Troubleshooting52B-8
Code No.21, 22, 61 or 62 Driver’s side air bag module
(squib) systemProbable cause
These diagnosis codes are output if there is abnormal resistance between the input
terminals of the driver’s side air bag module (squib).
The trouble causes for each diagnosis code No. are as follows.
Malfunction of clock spring

Partial disconnection due to incorrect clock spring
neutral position

Malfunction of wiring harnesses or connectors

Malfunction of driver’s side air bag module (squib)

Malfunction of SRS-ECU
Code No.Trouble symptom
21
Short in driver’s side air bag module (squib) or harness short

Short in clock spring

Malfunction of connector*
22
Open circuit in driver’s side air bag module (squib) or open harness

Open circuit in clock spring

Malfunction of connector contact
61
Short in driver’s side air bag module (squib) harness leading to the power supply
62
Short in driver’s side air bag module (squib) harness leading to the earth
NOTE
*: The connector in the squib circuit has a built-in short bar which short-circuits between plus (+) lead and minus
(–) lead of the squib circuit when the connector is not being connected to prevent an accidental air bag deployment
possibly caused by static electricity, etc. Therefore, malfunction of the connector can also be caused by this
short bar which fails to be released even when the connector is reconnected if it is damaged.
MUT-II Self-diag code

Disconnect clock spring
connector B-82.

Connect SRS check har-
ness connector (1).

Erase diagnosis code
memory.
Are code Nos.21, 22, 61 or
62 output?Ye sCheck the following
connectors:
B-82, B-51NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire
between the SRS-ECU
and clock spring.NG
Repair
OK
Replace the SRS-ECU.
No
Check the clock spring. (Refer to P.52B-30.)NG
Repair
OK
Replace the driver’s side air bag module.
SRS check harness
(MB991613)
Body wiring
harness
Clock spring
1

SRS – Troubleshooting52B-10
Code No.34 Connector lock systemProbable cause
This diagnosis code is output if a poor connection of the SRS-ECU is detected. However,
if the vehicle condition returns to normal, diagnosis code No.34 will be automatically
erased, and the SRS warning lamp will switch off.
Malfunction of connectors

Malfunction of SRS-ECU
Is B51 SRS-ECU connector correctly connected?Ye s
No
Repair
Check the following connector:
B-51
OK
Replace the SRS-ECU.ReplaceNG
Code No.35 SRS-ECU (deployed air bag) systemProbable cause
This diagnosis code is output after the air bag deploys. If this code is output before
the air bag has deployed, the cause is probably a malfunction inside the SRS-ECU.
Malfunction of SRS-ECU
Replace the SRS-ECU.
Code No.41 IG1 (A) power circuit systemProbable cause
This diagnosis code is output if the voltage between the IG1 (A) terminal and the
earth is lower than the specified value for a continuous period of 5 seconds or more.
However, if the vehicle condition returns to normal, diagnosis code No.41 will be
automatically erased, and the SRS warning lamp will switch off.
Malfunction of wiring harnesses or connectors

Malfunction of SRS-ECU
Measure at SRS check harness
connector (5).

Disconnect SRS-ECU
connector B-51.

Connect SRS check
harness connector (3).

Continuity between
terminals (20)
OK:ContinuityNGCheck the following
connectors:
B-51, B-78, B-80NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire between the SRS-ECU and earth, and
repair if necessary.
OK
Measure at SRS check harness connector (5).

Disconnect SRS-ECU connector B-51.

Connect SRS check harness connector (3).

Ignition switch: ON

Voltage between terminal (14) and body earth
OK:9 V or moreNGCheck the following
connectors:
B-51, B-78NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire between the SRS-ECU and ignition switch
IG
1, and repair if necessary.
OK
Replace the SRS-ECU.
SRS check harness
(MB991613)
3
5

SRS – SRS Maintenance52B-16
SRS COMPONENT VISUAL CHECK
Turn the ignition key to the LOCK (OFF) position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 60 seconds after disconnecting the battery
cable before doing any further work. (Refer to P.52B-3.)
SRS CONTROL UNIT (SRS-ECU)
1. Check SRS-ECU case and brackets for dents, cracks,
deformation or rust.
Caution
The SRS may not activate if the SRS-ECU is not
installed properly, which could result in serious injury
or death to the vehicle’s driver or front passenger.
2. Check connector for damage, and terminals for
deformation or rust.
Replace SRS-ECU if it fails visual check.
(Refer to P.52B-24.)
AIR BAG MODULES, STEERING WHEEL AND CLOCK
SPRING
1. Remove the air bag modules, steering wheel and clock
spring. (Refer to P.52B-25.)
Caution
The removed air bag modules should be stored in
a clean, dry place with the pad cover face up.
2. Check pad cover for dents, cracks or deformation.
Insulating tape
Battery
Battery (–) cable
SRS-ECU
Pad cover


Pad cover

SRS – SRS Maintenance52B-17
3. Check connector for damage, terminals deformities, and
harness for binds.
4. Check air bag inflator case for dents, cracks or deformities.
5. Check harness and connectors for damage, and terminals
for deformation.
6. Check clock spring connectors and protective tube for
damage, and terminals for deformation.
7. Visually check the clock spring case for damage.
8. Align the mating marks of the clock spring and, after
turning the vehicle’s front wheels to straight-ahead
position, install the clock spring to the column switch.
Mating Mark Alignment
Turn the clock spring clockwise fully, and then turn back
it approx. 3 4/5 turns counterclockwise to align the mating
marks.
Caution
If the clock spring’s mating mark is not properly
aligned, the steering wheel may not be completely
rotational during a turn, or the flat cable within the
clock spring may be severed, obstructing normal
operation of the SRS and possibly leading to serious
injury to the vehicle’s driver or front passenger.
9. Install the steering column covers, steering wheel and
the air bag module.
10. Check steering wheel for noise, binds of difficult operation.
11. Check steering wheel for excessive free play.
REPLACE ANY VISUALLY INSPECTED PART IF IT
FAILS THAT INSPECTION. (Refer to P.52B-25.)
Caution
The SRS may not activate if any of the above
components is not installed properly, which could
result in serious injury or death to the vehicle’s driver
or front passenger.
Inflator case
Connector

Inflator case
Connector
Protective tube
Case
Mating marksProtective tube

SRS – Post-collision Diagnosis52B-20
REPAIR PROCEDURE
WHEN AIR BAG DEPLOYS IN A COLLISION.
1. Replace the following parts with new ones.

SRS-ECU (Refer to P.52B-24.)

Air bag module (Refer to P.52B-25.)
2. Check the following parts and replace if there are any
malfunctions.

Clock spring (Refer to P.52B-25.)

Steering wheel, steering column and intermediate
joint
(1) Check wiring harness (built into steering wheel)
and connectors for damage, and terminals for
deformation.
(2) Install air bag module to check fit or alignment
with steering wheel.
(3) Check steering wheel for noise, binds or difficult
operation and excessive free play.
3. Check harnesses for binding, connectors for damage,
poor connections, and terminals for deformation.
(Refer to P.52B-18.)
WHEN AIR BAG DOES NOT DEPLOY IN LOW-SPEED
COLLISION.
Check the SRS components. If the SRS components are
showing any visible damage such as dents, cracks, or
deformation, replace them with new ones. Concerning parts
removed for inspection, replacement with new parts and
cautionary points for working, refer to appropriate INDIVIDUAL
COMPONENT SERVICE, P.52B-22.

SRS – Post-collision Diagnosis52B-21
SRS-ECU
1. Check SRS-ECU case and brackets for dents, cracks
or deformation.
2. Check connector for damage, and terminals for
deformation.
Air bag modules
1. Check pad cover for dents, cracks or deformation.
2. Check connector for damage, terminals deformities, and
harness for binds.
3. Check air bag inflator case for dents, cracks or deformities.
4. Install air bag module to steering wheel to check fit or
alignment with the wheel.
Clock spring
1. Check clock spring connectors and protective tube for
damage, and terminals for deformation.
2. Visually check the case for damage.
SRS-ECU

Connector

Inflator case
ConnectorInflator case
Case Protective tube
Protective tube