Mitsubishi 380. Manual — part 78

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-309

FLASHER TIMER

GENERAL DESCRIPTION CONCERNING THE FLASHER TIMER

M1549023600238

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

The following ECUs affect the functions and control
of the flasher timer.

FLASHER TIMER FUNCTION

.

TURN-SIGNAL LAMP

The turn-signal lamp output (flashing signal) is turned ON when
the ignition switch is ON and the turn-signal lamp switch is ON
(LH or RH). If the front turn-signal lamp or rear turn-signal lamp
bulb has burned out, the flashing speed increases to indicate
that the bulb has burned out.

NOTE: If LH or RH side turn signal lamp bulbs have burned
out, the flashing speed will remain the same.

.

TURN-SIGNAL INDICATORS

At the same time that the turn-signal lamps are illuminated, the
ETACS-ECU sends a signal to illuminate the turn-signal lamp
indicator via the CAN bus line. The combination meter receives
the transmitted signal and turns the turn-signal lamp indicator
on and off.

.

HAZARD WARNING LAMP

Detects the signal where the hazard warning lamp switch input
changes from OFF to ON, and reverse the flashing state
according to this signal. The hazard warning lamps toggle on
and off whenever the hazard warning lamp switch is operated.

NOTE: The hazard warning lamp switch is a push-return type
toggle switch.

FUNCTION

CONTROL ECU

Turn-signal lamp

ETACS-ECU, column switch

Turn-signal indicators

ETACS-ECU, column switch

Hazard warning lamp

ETACS-ECU

AC005444AB

Ignition switch

Turn signal

light switch LH

Turn signal

light switch RH
Turn signal

light output LH
Turn signal

light output RH

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

AC005445AB

Hazard light

switch

Turn signal

light output LH

Turn signal

light output RH

ON

OFF

ON

OFF

ON

OFF

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-310

INSPECTION PROCEDURE I-1: Flasher Timer: Turn-signal lamps do not flash when the turn-signal
lamp switch is turned on.

NOTE: This troubleshooting procedure requires the
use of Diagnostic Tool MB991958 and SWS monitor
kit MB991813. For details on how to use the SWS
monitor, refer to "How to connect SWS monitor

P.54B-13

."

.

CIRCUIT OPERATION

• The turn-signal lamp switch sends a signal

through the column-ECU (incorporated in the col-
umn switch) to the ETACS-ECU. If the col-
umn-ECU sends a turn-signal lamp switch "ON"
signal to the ETACS-ECU, the ETACS-ECU turns
on the flasher timer (incorporated in the
ETACS-ECU), thus causing the turn-signal lamps
to flash.

• The ETACS-ECU operates the turn-signal lamps

according to the following signals:

• Ignition switch (IG1): ON

• Turn-signal lamp switch: ON

• The ETACS-ECU flashes the turn-signal lamps

under the following conditions:

• Ignition key: "ON" position

• Turn-signal lamp switch: Left or right turn-sig-

nal position

.

TECHNICAL DESCRIPTION (COMMENT)

If the turn-signal lamps do not flash normally, the
input circuits from the switches described in "CIR-
CUIT OPERATION" or the ETACS-ECU may be
defective. If the hazard warning lamps do not flash,
the power supply line to the ETACS-ECU (dedicated
to the turn-signal lamps) may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• 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 ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Diagnostic 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: Test Probe Harness

STEP 1. Check the hazard warning lamp.

Q: Do the hazard warning lamps work normally?

YES : Go to Step 7.
NO : Go to Step 2.

16DB327A

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-311

STEP 2. Check the turn-signal lamps.

Q: Does either of the turn-signal lamps illuminate?

Only right or left side lamp does not illuminate. : Go to

Step 3.

Turn-signal lamps do not illuminate at all : Go to Step 4.

STEP 3. Check ETACS-ECU connector C-219, junction
block connectors C-214 and C-204 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are ETACS-ECU connector C-219, junction block

connectors C-214 and C-204 in good condition?
YES : Replace the ETACS-ECU. Verify that the turn-signal

lamps illuminate normally.

NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the turn-signal lamps illuminate

normally.

STEP 4. Check ETACS-ECU connector C-219 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-219 in good condition?

YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the turn-signal lamps illuminate

normally.

16DB442A

CONNECTORS: C-204, C-214

HARNESS SIDE

C-204

C-214

HARNESS SIDE

10

1

6

14

5

12

13

4

11

7

2

3

8

9

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-312

STEP 5. Check the battery power supply circuit to the
ETACS-ECU. Measure the voltage at ETACS-ECU
connector C-219.
(1) Disconnect ETACS-ECU connector C-219, and measure

the voltage available at the junction block side of the
connector.

(2) Measure the voltage between terminal 11 and ground.

• The voltage should measure approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Replace the ETACS-ECU. Verify that the turn-signal

lamps illuminate normally.

NO : Go to Step 6.

STEP 6. Check the wiring harness between ETACS-ECU
connector C-219 (terminal 11) and the battery.

NOTE: Also check junction block connector C-214 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector C-214 is damaged,
Repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Is the wiring harness between ETACS-ECU connector

C-219 (terminal 11) and the battery in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the turn-signal lamps illuminate normally.

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC209891

201918 171615 1413 1211 10 9 8 7 6 5 4 3 2 1

AC

CONNECTOR C-219
(JUNCTION BLOCK SIDE)

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

54DB057A

CONNECTOR: C-214

HARNESS SIDE

10

1

6

14

5

12

13

4

11

7

2

3

8

9