Mitsubishi Evolution X. Manual - part 1074

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-657

TECHNICAL DESCRIPTION (COMMENT)

If there is an error to the front door switch (RH) input 
signal, the front door switch (RH) signal is no longer 
output to the communication line.

.

TROUBLESHOOTING HINTS

• The front door switch (RH) 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

STEP 1. Check front door switch (RH) connector D-43 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector. 
Q: Is front door switch (RH) connector D-43 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 front door 

switch (RH) is normal.

STEP 2. Check the front door switch (RH).
Remove the front door switch (RH). Then check the continuity 
between the switch terminals and the switch body.

Q: Is the front door switch (RH) in good condition?

YES : Go to Step 3.
NO :  Replace the front door switch (RH). Check that the 

input signal of front door switch (RH) is normal.

STEP 3. Measure at the lower metal part of the front door 
switch (RH) in order to check the ground circuit to the front 
door switch (RH).
NOTE: Check that the front door switch (RH) is grounded to the 
vehicle body by means of its mounting screw.
Remove the cap, and measure the resistance value between 
the lower metal part and the ground. 

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 4.
NO :  Check the fit of the switch, and repair if necessary. 

Check that the input signal of front door switch (RH) is 
normal.

Switch position

Tester 
connection

Specified condition

Released

3 

− switch body

Continuity exists 

 

(2 ohms or less)

Pressed

3 

− switch body

Open circuit

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-658

STEP 4. 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 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that the input signal of front door 

switch (RH) is normal.

STEP 5. Check the wiring harness between front door 
switch (RH) connector D-43 (terminal 3) and ETACS-ECU 
connector C-313 (terminal 12).
Check the input lines for open circuit and short circuit.
Q: Is the wiring harness between driver's door switch 

connector D-43 (terminal 3) and ETACS-ECU connector 
C-313 (terminal 12) in good condition?
YES : Replace the ETACS-ECU. Check that the input signal 

of front door switch (RH) 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 front door switch (RH) is normal.

Inspection Procedure 7: ETACS-ECU does not receive any signal from the rear door switch (LH).

ETACS-
ECU

REAR DOOR
SWITCH (LH)

Rear Door Switch (LH) Input Circuit

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-659

.

TECHNICAL DESCRIPTION (COMMENT)

If there is an error to the rear door switch (LH) input 
signal, the rear door switch (LH) signal is no longer 
output to the communication line.

.

TROUBLESHOOTING HINTS

• The rear door switch (LH) 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

STEP 1. Check rear door switch (LH) connector D-19 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector. 
Q: Is rear door switch (LH) connector D-19 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 rear door 

switch (LH) is normal.

STEP 2. Check the rear door switch (LH).
Remove the rear door switch (LH). Then check the continuity 
between the switch terminals and the switch body.

Q: Is the rear door switch in good condition?

YES : Go to Step 3.
NO :  Replace the rear door switch (LH). Check that the 

input signal of rear door switch (LH) is normal.

AC708972AQ

Connector: C-313

ETACS-ECU

C-313 (BR)

AC708955

Connector: D-19

AR

Switch position

Tester 
connection

Specified condition

Released

3 

− switch body

Continuity exists 

 

(2 ohms or less)

Pressed

3 

− switch body

Open circuit

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-660

STEP 3. Measure at the lower metal part of the rear door 
switch (LH) in order to check the ground circuit to the rear 
door switch (LH).
NOTE: Check that the rear door switch (LH) is grounded to the 
vehicle body by means of its mounting screw.
Remove the cap, and measure the resistance value between 
the lower metal part and the ground. 

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 4.
NO :  Check the fit of the switch, and repair if necessary. 

Check that the input signal of rear door switch (LH) is 
normal.

STEP 4. 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 5.
NO :  Repair or replace the damaged component(s) (Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

). Check that the input signal of rear door 

switch (LH) is normal.

STEP 5. Check the wiring harness between driver's door 
switch connector D-19 (terminal 3) and ETACS-ECU 
connector C-313 (terminal 7).
Check the input lines for open circuit and short circuit.
Q: Is the wiring harness between rear door switch 

connector D-19 (terminal 3) and ETACS-ECU connector 
C-313 (terminal 7) in good condition?
YES : Replace the ETACS-ECU. Check that the input signal 

of rear door switch (LH) 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 rear door switch (LH) is normal.