Mitsubishi 3000GT Service Manual page 1107

Ground
With voltmeter
With scan tool
When using the MUT-II
INPUT SIGNAL <POWER SEAT, TENSION-REDUCER
TYPE SEAT BELT AND BUZZER>
When the scan tool [Multi-use tester (MUT)] or a
voltmeter is used
Using the scan tool or voltmeter, check whether or not the
input signals from each switch are being input to the ETACS
unit.
(1) Connect the scan tool to the data link connector or connect
the voltmeter between the ETACS terminal and the ground
terminal.
(2) Check if the buzzer of the scan tool sounds or the needle
of the voltmeter moves when each switch is operated.
if the buzzer sounds or the needle moves, the input signals
are being input to the ETACS unit, so that switch can
be considered to be functioning normally. If not, the switch
or switch input circuit is faulty. Check the switch and the
switch input circuit.
When the scan tool (MUT-II) is used.
(1) Connect the scan tool to the data link connector to read
out the diagnostic trouble codes.
When connecting the scan tool to a vehicle up to 1993
model, use the adapter harness supplied together.
Caution
Make certain that the ignition switch is at OFF when
the scan tool is connected or disconnected.
(2) If the buzzer of the scan tool sounds once when each
switch is operated (turned ON/OFF), the circuit system
of the switch sends the input signal to the ECU normally.
00002231
TSB Revision