Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 544

<RS>
Dummy resistor
(MB991865)
Resistor harness
resistance (3Ω)
(MB991866)
C- 204 clock spring
harness side connector
<Check the circuit between the SRS-ECU and clock
spring>
Measure at the SRS-ECU connector C- 21.
D Disconnect the SRS-ECU connector C-21.
D Release the the clock spring connector C-204.
Caution
Disconnect the connector and short-circuit the squib
circuit before releasing the short bar of the SRS-ECU
connector in the following operation.
D Cable bands between terminals 11, 12 and the short bar
(width:3 mm, thickness:0.5 mm) between terminals 11 and
12 and the short bar, and release the short bar.
(See Figure A.)
Caution
As the short bar may not be releasable if inserted
insufficiently, insert more than 4 mm.
D Measure at the harness side
D Continuity check between terminals 11 and 12
Caution
Do not directly insert a probe or other devices at the
front of the connector to avoid a possible decrease in
the contact pressure.
OK: No continuity
Connector C-21
Replace the SRS-ECU.
SRS -
YES
OK
Troubleshooting
<Clock spring check>
MUT-II self-diag code
D Release the clock spring connector (2- pin) C-204.
D Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D Insert the resistor harness
(MB991866) behind the harness side connector C-204.
Caution
Do not directly insert a probe or other devices at the front of the
connector to avoid a possible decrease in the contact pressure.
D Connect the negative (- ) terminal of the battery
D Check the diagnosis code again after erasing the memory.
Is code No.21 output?
Check the clock spring (Refer to P.52B-59.)
YES
Replace the driver's air bag module
(squib).
NG
Check connector: C-21, C-204
OK
Check the trouble
symptoms.
NG
Check the harness between the clock spring and the
SRS-ECU, and repair if necessary.
Figure A
Section
Cable band
A - A
and etc.
4 mm or more
52B-13
NO
NO
Replace the clock spring.
NG
Correct
Front view of SRS-ECU
connector C-21
(harness side)
Terminal
A
A
Short bar