Mitsubishi Montero (2004+). Manual — part 742

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-225

STEP 1. Use scan tool MB991958 to select "ECU COMM
CHK" on the SWS monitor display.
Check the following ECUs:

• ETACS-ECU

• Sunroof motor assembly (sunroof-ECU)

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect the special tool. Refer to "How to connect SWS

monitor

P.54B-7

(2) Connect SWS monitor kit MB991862 to the data link

connector (13-pin).

(3) Turn the ignition switch to the "ON" position.
(4) Operate scan tool MB991958 according to the procedure

below to display "ECU COMM CHK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

(5) Scan tool MB991958 should show "OK" on the "ECU

COMM CHK" menus for the "ETACS ECU" and "SUNROOF
ECU" menus.

Q: Is "OK" displayed on the "ETACS ECU" and "SUNROOF

ECU" menus?
"OK" are displayed for all the items : Go to Step 2.
"NG" is displayed on the "ETACS ECU" menu : Refer to

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

P.54B-42

."

"NG" is displayed on the "SUNROOF ECU" menu :

Refer to Inspection Procedure A-5 "Communication
with sunroof motor (sunroof-ECU) is not possible

P.54B-56

."

AC309091

MB991911

MB991827

MB991824

AB

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-226

STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
(1) Turn the ignition switch to the "OFF" position to check the

input signals from the following switches.

(2) Operate scan tool MB991958 according to the procedure

below to display "SUNROOF-OPE."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "SUNROOF."
6. Select "SUNROOF-OPE."

(3) Check that normal conditions are displayed on the items

described in the table below.

Q: Are normal conditions displayed on the "IG SW (IG1)"

and "S/R ECU ACK"?
Normal conditions displayed for all the items : Replace

the sunroof motor assembly. The sunroof timer
function should now work normally.

Normal condition is not displayed on the "IG SW(IG1)" :

Refer to Inspection Procedure O-2 "ETACS-ECU
does not receive a signal from the ignition switch
(IG1)

P.54B-505

."

Normal condition is not displayed on the "S/R ECU
ACK" : Replace the sunroof motor assembly. The sunroof

timer function should now work normally.

INSPECTION PROCEDURE F-4: Sunroof: Safety mechanism does not function.

.

TECHNICAL DESCRIPTION (COMMENT)
The sunroof motor assembly monitors load condition
according to the current, which runs in the motor. If a
predetermined current is exceeded, the sunroof
motor reverses due to safety mechanism. If the sun-
roof motor does not reverse when an excessive load
is applied, the sunroof motor assembly may be
defective.

.

TROUBLESHOOTING HINT
The sunroof motor assembly may be defective

.

DIAGNOSIS
Replace the sunroof motor assembly.
Verify the sunroof safety mechanism should now work nor-
mally.

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 30

IG SW (IG1)

OFF

ITEM 72

S/R ECU ACK

NORMAL ACK

AC309091

MB991911

MB991827

MB991824

AB

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-227

WINDSHIELD WIPER AND WASHER

GENERAL DESCRIPTION CONCERNING THE WINDSHIELD WIPER AND WASHER

M1549021500075

The following ECUs affect the functions and control
of the windshield wiper and washer.

Windshield wiper and washer control function

.

Intermittent control
The ETACS-ECU calculates the intermittent time from the
windshield wiper intermittent time adjusting knob at the column
switch and sends it to the front-ECU as SWS data.
The front-ECU determines the intermittent time T1 from the
input SWS data signal, and turns ON the windshield wiper drive
signal. When the wiper is at the STOP position, the windshield
wiper auto-stop signal goes OFF to turn OFF the windshield
wipe drive signal. After the intermittent time T1 seconds from
when the windshield wiper drive signal turned ON, the wind-
shield wiper drive signal is turned ON again and the above
operation is repeated.

.

Mist wiper control
When the ignition switch is at the ACC or ON posi-
tion, if the windshield mist wiper switch of the column
switch is turned ON, the front-ECU turns ON the
windshield wiper drive signal. At the same time, the
wiper speed switching relay is turned ON
(HIGH-SPEED). While the windshield mist wiper
switch is ON, the windshield wiper will operate at
high speed. Then, if the windshield mist wiper switch
is turned off, the wiper operates at low speed until it
stops at the predetermined park position.

When the windshield mist switch is turned on briefly,
the wiper operates at low speed once.
At the point the windshield mist switch is turned ON,
if the windshield wiper has been operating intermit-
tently, the same operations as the above will be per-
formed while the windshield mist wiper switch is ON.
After the windshield mist wiper switch goes OFF, the
intermittent operations will be set again T1 seconds
after the windshield wiper auto-stop signal is turned
ON last.

FUNCTION

CONTROL ECU

Intermittent control

ETACS-ECU, front-ECU, column switch

Mist wiper control

front-ECU, column switch

Low speed wiper, high speed wiper control

front-ECU, column switch

Washer control

front-ECU, column switch

AC200355AC

ON

OFF

ON

OFF

WINDSHIELD
WIPER
AUTOSTOP
SIGNAL

WINDSHIELD
WIPER DRIVE
SIGNAL

T1

T1

T1: Intermittent time

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-228

.

Low speed wiper, high speed wiper control
When the ignition switch is at the ACC or ON posi-
tion, if the windshield low speed wiper switch of the
column switch is turned ON, the front-ECU turns ON
the windshield wiper drive signal, turns OFF (LO) the
windshield wiper speed switching relay, and operates

the windshield wiper at low speed. Next, when the
windshield high speed wiper switch is turned ON, the
windshield wiper drive signal is turned ON, the wind-
shield wiper speed switching relay is turned ON (HI),
and the windshield wiper is operated at high speed.

.

Washer control
When the ignition switch is at the ACC or ON posi-
tion, if the windshield washer switch of the column
switch is turned ON, the front-ECU turns ON the
windshield washer relay. The windshield wiper drive
signal is turned ON in 0.3 second until 3 seconds
after the windshield washer switch goes OFF to

operate the windshield wiper continuously. When the
windshield washer switch is turned ON, if the wind-
shield wiper is operating intermittently, intermittent
operations will be continued after continuous opera-
tions.
NOTE: The wiper drive signal output time varies
according to the conditions. Refer to the following
table for details.

AC203080AB

ON

OFF

ON

OFF

ON

OFF

ON (HIGH)

WINDSHIELD MIST
WIPER SWITCH

WINDSHIELD WIPER
AUTO-STOP SIGNAL

WINDSHIELD WIPER
DRIVE SIGNAL

WINDSHIELD WIPER
SPEED SWITCHING
RELAY

OFF (LOW)

WHEN WINDSHIELD
WIPER SWITCH IS OFF

WHEN WINDSHIELD INTERMITTENT
WIPER IS OPERATING

T1: Intermittent time

T1

T1

AC203089AB

ON

OFF

ON

OFF

ON

OFF

(HI) ON

WINDSHIELD LOW SPEED
WIPER SWITCH

WINDSHIELD HIGH SPEED
WIPER SWITCH

WINDSHIELD WIPER
AUTO-STOP SIGNAL

ON

OFF

WINDSHIELD WIPER
DRIVE SIGNA

WINDSHIELD WIPER SPEED
SWITCHING RELAY

(LO) OFF

LOW SPEED OPERATIONS

HIGH SPEED OPERATIONS