Mitsubishi Galant. Manual - part 660
SWS DIAGNOSIS
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-35
STEP 3. Check the input signal (by using a voltmeter).
Check the input signals from the following switches:
•
Ignition switch (IG1)
•
Key reminder switch
•
Driver's door switch
(1)Use special tool MB991529 to connect a voltmeter between
ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.
(2)Check that the voltmeter indicator deflects once when the
input signal enters.
Q: Does the voltmeter indicator deflect?
YES : Replace the ETACS-ECU. The ignition key reminder
tone alarm function should work normally.
NO : Check the relevant input circuit. Refer to
Inspection Procedure B-2: Tone alarm: Light reminder tone alarm function does not work normally.
TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU operates the light reminder tone
alarm function, based on input signals from the
following switches and the front-ECU:
•
Ignition switch (IG1)
•
Driver's door switch
•
Taillight switch
•
Headlight switch
If the function does not work normally, a defect on
the relevant circuit or the ETACS-ECU may be
suspected.
TROUBLESHOOTING HINTS
•
Malfunction of the driver's door switch
•
Malfunction of the column switch (turn-signal light
and lighting switch)
•
Malfunction of the ETACS-ECU
•
Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
•
MB991502: Scan Tool (MUT-II)
•
MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the ETACS-ECU power supply circuit.
If the ignition switch is at "LOCK" (OFF) position, do all of the
following functions operate?
•
Ignition key reminder tone alarm function
•
Central door locking system
•
Hazard warning light
•
Interior light dimming function
•
Theft-alarm system
Q: Do any functions described above operate?
YES : Go to Step 2 <when using scan tool MB991502> or 3
<when using a voltmeter>.
NO : Check the ETACS-ECU battery circuit. Refer to
Inspection Procedure O-1 (
AC003083
16 PIN
AB
ETACS-ECU
TERMINAL
GROUNDED TERMINAL
MB991529