Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 571

52B-40
Code No.68 Front passenger's seat belt pre-tensioner
(squib) system (short-circuited to power supply)
Code No.69 Front passenger's seat belt pre-tensioner
(squib) system (short-circuited to earth)
This code is output when the input terminal of the SRS-ECU front passenger's
seat belt pre-tensioner (squib) is short-circuited to power supply (code No.68) or
short-circuited to earth (code No.69).
Dummy resistor
(MB991865)
resistance (3Ω)
Instrumental panel
wiring harness
YES (when No.68 is output)
<Check the circuit between the SRS-ECU and
the front passenger's seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
D Disconnect the SRS-ECU connector C-41.
D Disconnect the front passenger's seat belt
pre-tensioner connector D-28*
D Ignition switch:ON
D Measure at the harness side
D Voltage between terminal 27 or 28 and body
earth
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: 0 V
Connector C-41
OK
NG
Replace the SRS-ECU.
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
S R S -
Tr o u b l e s h o o t i n g
Resistor harness
(MB991866)
Front passenger's seat belt
pre-tensioner connector
<Check the circuit between the SRS-ECU and
the front passenger's seat belt pre-tensioner>
Measure at the SRS-ECU connector C-41 .
D Disconnect the SRS-ECU connector C-41.
D Disconnect the front passenger's seat belt
1 2
and D-26* pre-tensioner connector D-28*
.
D Measure at the harness side
D Continuity between terminal 27 or 28 and
body earth
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-41
Check connector: D-28*
Check the trouble symptoms.
Check the harness between the front passenger's seat belt pre-tensioner and the
SRS-ECU, and repair if necessary.
Possible Cause
D Harness or connector fault
D The harness of the front passenger's seat belt
pre-tensioner (squib) is short-circuited to power
supply (code No.68) or short-circuited to earth
(code No.69).
D SRS-ECU inoperable
<Check the front passenger's seat belt pre-tensioner (squib)>
MUT-II self-diag code
D Connect the dummy resistor (MB991865) to the resistor harness
(MB991866).
D Disconnect the front passenger's seat belt pre-tensioner connector
1 2
D-28* and D-26* and insert the resistor harness (MB991866)
behind the harness side connector.
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.68 or No.69 output?
YES (when No.69 is output)
Replace the front passenger's seat belt pre-tensioner.
1
and D-26*
NG
1 2
, D-26* , C-133*
OK
NG
NO
OK
Replace the SRS-ECU.
2
.
NG
1 2
, C-112* , C-41
Correct