Mitsubishi Grandis. Manual - part 194

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-238

Step 2. Pulse check.

Check the input signal, which are related to the R 
(reverse) gear-linked rear wiper operation.

OK: The MUT-III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to diagnosis code No.11 inspection 
procedure  "Engine-A/T-ECU time-out 
(related to engine) 

P.54C-37

 ."

Step 3. Retest the system.

Check that the rear wiper operates consecutively 
when the selector lever is moved to the R position 
during the rear wiper operation.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Replace the ETACS-ECU.

INSPECTION PROCEDURE H-3: When the shift lever is moved to "R" position during the rear wiper 
operation, the rear wiper does not operate at the continuous mode. <M/T>

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

If the rear wiper does not operate consecutively 
when the selector lever is moved to the R position 
during the rear wiper operation, the input signal 
circuit to the back-up lamp switch ("R" position) or 
the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the back-up lamp switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

System switch

Check condition

Inhibitor switch (reverse 
position)

When the ignition switch 
is turned ON and the 
selector lever is moved 
to the R position.

IGNITION
SWITCH (ACC)

ETACS-ECU

J/B SIDE

REAR
WIPER
RELAY

INPUT SIGNAL

· BACK-UP LAMP SWITCH
· REAR WIPER SWITCH

REAR WIPER
MOTOR

"R" Position During Rear Wiper Operation Circuit <M/T>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-239

Step 1. SWS monitor data list.

Check the SWS communication signal, which are 
related to the R (reverse) gear-linked rear wiper 
operation.

<Selected item> REAR WIPER-REV. INTERLOCK

• Ignition switch: ON

• Rear wiper switch: ON

• Shift position: R position

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure Q-3 "The 
back-up lamp switch <M/T> signal is not 
received 

P.54C-463

"

Step 2. Retest the system.

Check that the rear wiper operates consecutively 
when the shift lever is moved to the R position during 
the rear wiper operation.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Replace the ETACS-ECU.

Item No.

Item name

Normal 
condition

Item 41

INHIBITOR SW

ON

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-240

Inspection Procedure H-4: The rear washer does not work.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

If the rear washer does not work normally, the input 
signal circuits to the rear washer switch, rear washer 
motor or the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the rear washer motor

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Malfunction of the front-ECU

• Damaged harness wires and connectors

IGNITION
SWITCH (ACC)

ETACS-ECU

J/B SIDE

INPUT SIGNAL

REAR WASH. SW

WASHER
MOTOR

FRONT-ECU

REAR WASHER
RELAY

WINDSHIELD
WASHER RELAY

Rear Washer Drive Circuit

Wire colour code
B : Black     LG : Light green
G : Green     L : Blue
W : White     Y : Yellow
SB : Sky blue     BR : Brown
O : Orange     GR : Gray
R : Red     P : Pink     V : Violet

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-241

DIAGNOSIS PROCEDURE

Step 1. Confirm the operation of the rear wiper.

Check that the rear wiper work normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure H-1 "The rear 
wiper does not work at all 

P.54C-228

."

Step 2. ECU check by using the SWS monitor.

Check that the power supply and earth lines to the 
column switch (column-ECU) and the front-ECU and 
the SWS communication lines are normal.

• Turn the ignition switch to the ACC position.

ECUS TO BE CHECKED

• Column ECU

• ETACS ECU

• Front ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

"OK" are displayed for all the items : 

Go to Step 3.

"NG" is displayed on the "COLUMN ECU" menu. : 

Refer to Inspection Procedure A-2 
"Communication with the column switch 
(column-ECU) is not possible 

P.54C-56

."

"NG" is displayed on the "ETACS ECU" menu. : 

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-63

."

"NG" is displayed on the "FRONT ECU" menu. : 

Refer to Inspection Procedure A-4 
"Communication with the front-ECU is not 
possible 

P.54C-70

."

Step 3. Function diagnosis by using the SWS 
monitor

Check the SWS communication signal, which are 
related to the rear washer function.

<Selected item> REAR WIPER-REAR WASHER

• Ignition switch: ACC

• Rear washer switch: ON

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to inspection procedure Q-7 "The 
column switch (windshield wiper washer 
and rear wiper washer switch) signal is not 
received 

P.54C-479

."

Step 4. Connector check: A-34 washer motor 
connector.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector.

Step 5. Check the washer motor.
Refer to GROUP 51 

− Rear wiper and washer 

P.51-29

.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Replace the rear washer motor.

Step 6. Confirm the operation of the windshield 
washer.

Check that the windshield washer work normally.

Q: Is the check result normal?

YES : 

Replace the ETACS-ECU.

NO : 

Go to Step 7.

Item No.

Item name

Normal 
condition

Item 14

REAR WASH. SW

ON

AC310401

Connector: A-34 <LHD>

Harness side

A-34 (GR)

AF

AC310396

Connector: A-34 <RHD>

Harness side

A-34 (GR)

AF