Mitsubishi Galant 9G. Manual — part 100
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-396
General circuit diagram for the fog lights
BATTERY
FOG LIGHT
RELAY
RELAY BOX
FOG LIGHT
SWITCH
FOG
LIGHT (LH)
FOG
LIGHT (RH)
RHEOSTAT
COL
U
MN-ECU
COLUMN SWITCH
LIGHTING
SWITCH
DATA LINK
CONNECTOR
IGNITION
SWITCH (IG1)
ETACS-
ECU
22
RELAY BOX
(FUSE )
6
RELAY BOX
(FUSE )
DIMMER
·PA
S
S
IN
G
SWITCH
(HEAD)
(T
AIL)
(DIMMER)
(P
AS
SING)
IGNITION
SWITCH (IG2)
JUNCTION BLOCK
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-397
IGNITION
SWITCH (IG1)
ETACS-
ECU
COMBINATION
METER
CPU
RHEOSTAT
CIRCUIT
22
RELAY
BOX
(FUSE )
DATA LINK
CONNECTOR
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-398
INSPECTION PROCEDURE J-1: Fog Light: Fog lights do not illuminate when the fog light switch is
turned on.
NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor
.
BATTERY
FOG
LIGHT
(RH)
FOG
LIGHT
(LH)
FRONT-ECU
RELAY
BOX
FOG LIGHT
RELAY
Fog Light Circuit
AC305977AC
CONNECTORS: A-05X, A-11X
A-11X
A-05X
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-399
CIRCUIT OPERATION
• The ETACS-ECU sends a fog light illumination
request signal ("LIGHT ON" signal) to the
front-ECU when the fog light switch is turned on
while the headlights are illuminating at low beam.
• Then the front-ECU switches on its relay to illumi-
nate the fog lights.
.
TECHNICAL DESCRIPTION (COMMENT)
If the headlights illuminate at low beam, the fog light
relay, the fog light switch, the front-ECU or the
ETACS-ECU may be defective.
.
TROUBLESHOOTING HINTS
• Trouble in input signal system
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
• The fog light relay may be defective
• The front-ECU may be defective
• The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
STEP 1. Check the headlight (low-beam) operation.
Q: Do the headlights illuminate at low beam normally?
YES : Go to Step 2.
NO : Refer to Inspection Procedure H-2 "The headlights
(low-beam) do not illuminate normally
."
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