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BE–82
(4) With a circuit tester set to the voltmeter mode, connect
the roll connector terminal and the body earth.
(5) Turn on the ignition switch. Check if the voltmeter reg-
isters approximately the battery voltage.
NOTE:
·
Measure the voltage of each connector terminal.
(6) Replacement of air bag ECU
NOTE:
·
As for this procedure, refer to item 3, "Replacement of
air bag ECU."
2. Checking procedure of air bag at the passenger's seat
side
(1) Turn off the ignition switch and wait for about 60 sec-
onds.
(2) Disconnect the connector which connects the wire
harness of the air bag unit and the wire cowl.
(3) Connect a circuit tester between the connector termi-
nal at the wire cowl side and the body earth with the
circuit tester set to the voltmeter mode.
(4) Turn on the ignition switch. Check if the voltmeter reg-
isters the battery voltage.
NOTE:
·
Measure the voltage of each connector terminal.
(5) Replacement of air bag ECU
NOTE:
·
As for this procedure, refer to item 3, "Replacement of
air bag ECU."
3. Replacement of air bag ECU
NOTE:
·
The code 42 is indicated when the vehicle was subject-
ed to a light impact which was not big enough to cause
the air bag to deploy and, therefore, the upstream igni-
tion circuit functioned temporarily. In such case, the
ECU resumes the normal operation later. Hence, the
ECU can be used again by canceling the code accord-
ing to the diagnosis code canceling method. When the
output of this code is attributable to causes other than
the malfunctioning ECU, no voltage has been applied
to the circuit during the check of the preceding item
1.(4), (5) or item 2.(3), (4).
(1) If the battery voltage is applied to the terminal during
the check of the preceding item 1.(4), (5) or item 2.(3),
(4), the ECU is regarded as malfunctioning. (The ECU
can not resume its normal operation regardless of
causes.) It is necessary to replace the air bag ECU.
(2) As for the replacing procedure of air bag ECU, refer to
page BE–61.
2nd lock
1st
lock
Airbag unit side
Wire cowl side
Diagnosis connector
Test terminal
(ECU-T)
Body earth
JBE00284-05123
JBE00285-05124
Body earth
JBE00286-05125
Earth
terminal (E)
JBE00287-05126
JBE00288-05127
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