Mitsubishi Evolution X. Manual - part 1076

ETACS

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CHASSIS ELECTRICAL

54A-665

STEP 2. Check the trunk lid latch.
Disconnect trunk lid latch connector F-19. Then check continu-
ity between terminals.

Q: Is the trunk lid latch in good condition?

YES : Go to Step 3.
NO :  Replace the trunk lid latch. Check that the input signal 

of trunk lid latch is normal.

STEP 3. Check the ground circuit to the trunk lid latch. 
Measure the resistance at trunk lid latch connector F-19.
(1) Disconnect trunk lid latch connector F-19 and measure the 

resistance available at the wiring harness side of the 
connector.

(2) Measure the resistance value between terminal 2 and 

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.
NO :  Go to Step 4.

STEP 4. Check the wiring harness between trunk lid latch 
connector F-19 (terminal 2) and ground.
Check the ground wires for open circuit.
NOTE: Also check intermediate connector F-27 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector F-27 is damaged, repair or 
replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between trunk lid latch connector 

F-19 (terminal 2) and ground 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. Check that 
the input signal of trunk lid latch is normal.

Ignition key

Tester connection Specified 

condition

Released

1 

− 2

Continuity exists 

 

(2 ohms or less)

Pressed

1 

− 2

Open circuit

AC608255 BL

Harness side: F-12

ETACS

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CHASSIS ELECTRICAL

54A-666

STEP 5. Check ETACS-ECU connector C-313 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-313 in good condition?

YES : Go to Step 6.
NO :  Repair or replace the damaged component(s) (Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

). Check that the input signal of trunk lid latch 

is normal.

STEP 6. Check the wiring harness between trunk lid latch 
connector F-19 (terminal 1) and ETACS-ECU connector 
C-313 (terminal 5).
Check the output lines for open circuit and short circuit.
NOTE: Also check intermediate connectors F-27and D-16 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in the connector. If intermediate connector F-27 or D-16 is 
damaged, repair or replace the connector as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between trunk lid latch connector 

F-19 (terminal 1) and ETACS-ECU connector C-313 
(terminal 5) in good condition?
YES : Replace the ETACS-ECU. Check that the input signal 

of trunk lid latch is normal.

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. Check that 
the input signal of trunk lid latch is normal.

ETACS

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CHASSIS ELECTRICAL

54A-667

Inspection Procedure 10: ETACS-ECU does not receive any signal from the hazard warning light 
switch.

.

TECHNICAL DESCRIPTION (COMMENT)

If there is an error to the hazard warning light switch 
input signal, the hazard warning light switch signal is 
no longer output to the communication line.

.

TROUBLESHOOTING HINTS

• The center panel unit may be defective

• The ETACS-ECU may be defective

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

Hazard Warning Switch Input Circuit

ETACS-
ECU

CENTER
PANEL
UNIT

HAZARD
WARNING
SWITCH

AC708951BC

Connector: C-124

AC708972AY

Connector: C-301

ETACS-ECU

ETACS

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CHASSIS ELECTRICAL

54A-668

STEP 1. Check center panel unit connector C-124 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector. 
Q: Is center panel unit connector C-124 in good condition?

YES : Go to Step 2.
NO :  Repair or replace the damaged component(s) (Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

). Check that the input signal of hazard 

warning light switch is normal.

STEP 2. Check the hazard warning light switch.
Remove the center panel unit. Then check continuity between 
the switch terminal and switch body.

Q: Is the hazard warning light switch in good condition?

YES : Go to Step 3.
NO :  Replace the center panel unit. Check that the input 

signal of hazard warning light switch is normal.

STEP 3. Check ETACS-ECU connector C-301 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector. 
Q: Is ETACS-ECU connector C-301 in good condition?

YES : Go to Step 4.
NO :  Repair or replace the damaged component(s) (Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

). Check that the input signal of hazard 

warning light switch is normal.

STEP 4. Check the wiring harness between center panel 
unit connector C-124 (terminal 5) and ETACS-ECU 
connector C-301 (terminal 19).
Check the input lines for open circuit and short circuit.
Q: Is the wiring harness between center panel unit 

connector C-124 (terminal 5) and ETACS-ECU connector 
C-301 (terminal 19) in good condition?
YES : Replace the ETACS-ECU. Check that the input signal 

of hazard warning light switch is normal.

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. Check that 
the input signal of hazard warning light switch is 
normal.

Switch position

Tester 
connection

Specified 
condition

Released

5 

− switch body

Continuity exists 
(2 ohms or less)

Pressed

5 

− switch body

Open circuit