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Mitsubishi Grandis. Manual - part 133

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-529

Inspection Procedure Q-25: The vehicle speed signal is not received.

CAUTION

Whenever the ECU is replaced, ensure that the
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

The vehicle speed signal is used to operate the
functions below. If the signal is abnormal, these
functions will not work normally.

• Windshield wiper and washer (vehicle

speed-dependent wiper function)

• Seat belt warning buzzer function

• Door ajar warning buzzer function

• Seat belt indicator

• Door ajar indicator

POSSIBLE CAUSES

• The CAN bus line is defective.

• Malfunction of the vehicles speed sensor

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54D

− Diagnosis

P.54D-16

Step 2. MUT-III diagnosis code
Check whether the combination meter-related
diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the combination meter (Refer to

GROUP 54A

− Combination meter

P.54A-35

NO :

Go to Step 3.

Step 3. Pulse check

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

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 :

Go to Step 4.

Step 4. Retest the system.
Check that the vehicle speed signal is received
normally.

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.

Speed Signal Input Circuit

ETACS-
ECU

SPEED SIGNAL

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

INPUT SIGNAL

System switch

Check condition

Vehicle speed
signal

When the vehicle speed has
reached 10 km/h or more

CHECK AT ECU TERMINAL

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-530

CHECK AT ECU TERMINAL

M1549001200812

ETACS-ECU

NOTE: Terminal numbers 1 to 20 can not be measured as the ETACS-ECU is mounted on the junction block
directly. The values are for reference only.

2019

1716

6 5

3 2 1

AC312902 AB

C-219

C-220

C-221

Termin
al No.

Check item

Check condition

Normal condition

Output to the power window relay

When the power windows are
operative

System voltage

Power supply to the central door
locking system (battery positive
voltage)

Always

System voltage

Earth (for ECU)

Always

0 V

Ignition switch (ACC)

Ignition switch: ACC

System voltage

Output to room lamp

When the room lamp is on

2 V or less

Power supply to interior lamp
(battery positive voltage)

Always (when the interior lamp off
function is off)

System voltage

Input from left rear door switch

Left rear door switches: ON (left
rear door open)

0 V

Power supply from ignition switch
(IG1)

Ignition switch: ON

System voltage

Output to right turn-signal lamps

When right turn-signal lamps are on System voltage

Input from driver's door switch

Driver's door switch: ON (door
open)

0 V

Power supply to hazard warning
lamp (battery positive voltage)

Always

System voltage

Output to central door locking (for
locking the doors)

When the door lock actuators lock
the doors

System voltage

Output to central door locking (for
unlocking the doors other than the
driver's door)

When the door lock actuators
unlock the doors

System voltage

Output to left turn-signal lamps

When the left turn-signal lamps are
on

System voltage

−

Output to rear wiper

When rear wiper is operating

System voltage

Input of rear wiper automatic stop
signal

When rear wiper is operating

System voltage

Power supply from ignition switch
(ACC)

Ignition switch: ACC

System voltage

CHECK AT ECU TERMINAL

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-531

−

Battery power supply (for ECU)

Always

System voltage

Input from rear fog lamp switch

Rear fog lamp switch: ON

0 V

Output to central door locking (for
unlocking the driver's door)

When the door lock actuators
unlock the doors

System voltage

Rear washer output

When rear washer is operating

System voltage

Input from remote controlled mirror
switch (fold switch)

Remote controlled mirror switch
(fold switch): ON

0 V

Input from passenger’s seat belt
switch

When passenger’s seat belt switch
is on

−

Input to key reminder switch

Key reminder switch: ON (ignition
key removed)

0 V

Output to electric retractable remote
controlled mirror (unfold)

When the door mirrors are folding

System voltage

Input to door key switch or tailgate
key switch (lock switch)

All doors and tailgate: Locked

0 V

Input to door key switch or tailgate
key switch (unlock switch)

All doors and tailgate: Unlocked

0 V

Input to driver's door lock actuator
(lock switch)

Driver's door lock: Locked

0 V

Input to driver's door lock actuator
(unlock switch)

Driver's door lock: Unlocked

0 V

Input from tailgate switch

Tailgate switch: ON (tailgate open)

0 V

Input to back-up lamp switch

Sift lever: R position
Ignition switch: ON

System voltage

Output to electric retractable remote
controlled mirror (unfold)

When the door mirrors are
unfolding

System voltage

Setting diagnosis code or sending
input check signal

When diagnosis code is set (the
MUT-II/III is connected or the
diagnosis connector No.1 is
earthed)

0 to 12 V (pulse signal)

When input check signal is sent

0 V, 12 V (input signal
is fluctuating)

Input from luggage room lamp
switch

Luggage room lamp switch: ON

0 V

Input from interior lamp off switch

Interior lamp switch: OFF

0 V

Input from front fog lamp switch

Front fog lamp switch: ON

0 V

Input from hazard warning lamp
switch

Hazard warning lamp switch: ON

0 V

Earth (for sensor)

Always

0 V

57, 58

−

SWS communication line

Always

0 to 12 V (pulse signal)

Termin
al No.

Check item

Check condition

Normal condition

CHECK AT ECU TERMINAL

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-532

COLUMN SWITCH

Power supply to automatic air
conditioner control (A/C-ECU)
illumination and radio illumination
(battery positive voltage)

Always

System voltage

Input to tailgate lock actuator

Tailgate lock: Locked

0 V

Input to tailgate lock release handle Tailgate lock release handle: ON

0 V

Input from interior lamp on switch

Interior lamp switch: ON

0 V

Earth (for daytime running lamp
function)

Always

0 V

Input from passenger's door switch Passenger's door switch: ON (door

open)

0 V

Input from windshield intermittent
wiper volume

Turn the ignition switch to the ACC
position, and move the wiper
volume from "Fast" to "Slow."

0 to 2.5 V

Input from diagnosis control

When MUT-III is connected

0 V

Input of SWS request signal

Always

0 to 12 V (pulse signal)

Output to ignition key cylinder
illumination lamp

When ignition key cylinder
illumination is on

2 V or less

Input from right rear door switch

Right rear door switches: ON (right
rear door open)

0 V

Power supply to interior lamp

Always (when the interior lamp off
function is off)

System voltage

−

Output to rear fog lamp

When rear fog lamp is on

System voltage

Termin
al No.

Check item

Check condition

Normal condition

AC312903 AB

C-301

Termin
al No.

Check item

Check condition

Normal condition

System voltage

Always

System voltage

Input of SWS request signal

Always

0 to 12 V (pulse signal)

SWS communication line

Always

0 to 12 V (pulse signal)

Earth

Always

0 V

−

Output to windshield intermittent
wiper volume

Ignition switch: ACC
Move the wiper volume from "Fast"
to "Slow."

0 to 2.5 V

−

Content .. 131 132 133 134 ..