Mitsubishi Pajero Pinin. Manual - part 338

CHASSIS ELECTRICAL – 

Multi-center Display <Middle Grade>

54A-68

2.

Diagnosis Function for Audio System

Audio system has the following diagnosis function.

Function

Contents

Speaker diagnosis function

This function checks if the speakers are all working normally on the audio system or
not.

Service functions
(1) Check the LCD segments
(2) Check the sensors
(3) Check units connected

into audio system

There are the following 3 diagnosis modes available.
The LCD segments for display available to light on or not.
Outside temperature, voltage of fuel gauge unit and battery, remaining fuel level, fuel
economy calculated after refuelling.
Units connected on display
Voltage on terminal for MUT-

II

Engine speed signal, which is sent by ECU
Oscillation of internal clock

3.

Speaker Connection Diagnosis

Outline

D

This diagnosis function checks whether the more than one wired speakers are normally connected
to the audio unit and the speaker wiring is pinched in the vehicle.

D

The test tone sounds from an applicable speaker according to the display (FL, FR, RL, RR).

Function explanation
To diagnose speaker connections, follow the procedure below to enter the test mode.
1.

Entry to test mode
(1) Turn the ignition switch to ACC.
(2) Turn off the power supply switch of the audio unit.
(3) Press the “CH1” button.
(4) Press the “Automatic tuning in down button.”
(5) Press the “Automatic tuning in up button.”
(6) Press the “CH6” button. Then the audio unit will enter the test mode.

NOTE
The above operation must be finished within 60 seconds after the power supply switch is turned
off (If 60 seconds have passed, the operation is invalid).
If you fail in the operation, you must push the power supply switch twice to reset the unit. Then
repeat the steps above from step (1).

(7) The test tone will sound at a constant interval. If you want to change an applicable speaker, you

should press the “CH6” button.

2.

Cancelling the test mode
The test mode will be canceled by one of the operations below.

D

Press any button (except the “CH6” button). In addition, if a mode button (LW/MW/LW, CD, TAPE)
is pressed, the audio unit will enter an applicable function after cancelling the test mode.

D

Turn the ignition switch to OFF(LOCK).

CHASSIS ELECTRICAL – 

Multi-center Display <Middle Grade>

54A-69

4.

Service Mode For Multi-center Display

1.

Enter and terminate the service mode
(1) To enter the service mode, turn the ignition switch to ACC.
(2) Press the “H” button twice.
(3) Press the “SET” button and (A) button at the same time.
(4) Then the audio unit will enter the service mode. 

First of all, the service mode will show model identification for the multi center display and the
vehicle identification. Then the service mode proceeds to three checks; LCD segment check, Sensor
check and Unit check. To switch over these checks, press the “SET” button.

(5) To terminate the service mode, press any button other than the “SET” button.

(A) Button

2.

Details of the service mode
The service mode checks the following in that order:
(1) LCD segment check

This screen is divided into four areas. Each area will be active sequentially whenever the “SET”
button is pressed.
When the “SET” button is pressed four times in this screen, the service mode will proceed to
the Sensor check.

(2) Sensor check

This screen shows voltage signals from the outside temperature sensor, the fuel gauge unit, and
the ignition switch as well as fuel economy.
When the “SET” button is pressed once in this screen, the service mode will proceed to the Unit
check.

(3) Unit check connected into audio system

This screen shows an audio equipment, air conditioner or MUT-

II

 connected in the system, percentage

of system voltage, engine speed sent by the engine-ECU, and oscillation of internal clock.
When the “SET” button is pressed once in this screen, the service mode will return to the first
screen (model identification screen).

CHASSIS ELECTRICAL – 

Multi-center Display <Middle Grade>

54A-70

MAIN UNIT TERMINAL VOLTAGES

1.

MULTI-CENTER DISPLAY UNIT

Termi-
nal No

Input/
Output

Signal Symbol

Terminal
Voltage

Harness Problem

Trouble Symptom Resulting from
Harness Problem

nal 

No.

Output

Voltage
(V)

Open
Circuit

Short-
circuit

Harness Problem

1 – 4

–

–

–

–

–

–

5

Input

ISOK

Hi: 
System
voltage
Lo: 0 – 1

f

f

MUT-

II

 cannot be used to check

engine-ECU.

6

–

–

–

–

–

–

7

Input/
Output

M–DATA (AUDIO)

Hi: 4 – 5
Lo: 0 – 1

f

f

Audio display dose not appear. Panel
switch cannot be operated for audio
unit. Nighttime illumination dose not
appear for audio unit.

8

Input/
Output

M–CLOCK (AUDIO)

Hi: 4 – 5
Lo: 0 – 1

f

f

Audio display dose not appear. Panel
switch cannot be operated for audio
unit. Nighttime illumination dose not
appear for audio unit.

9 – 14

–

–

–

–

–

–

15

Input/
Output

K

Hi: 
System
voltage
Lo: 0 – 1

f

f

Values on Trip information screen
(average speed, fuel consumption
and cruising distance) are abnormal.
Communication is not possible be-
tween the engine-ECU and the
MUT-

II

.

16

–

–

–

–

–

–

CHASSIS ELECTRICAL – 

Multi-center Display <Middle Grade>

54A-71

Termi-
nal No

Input/
Output

Signal Symbol

Terminal
Voltage

Harness Problem

Trouble Symptom Resulting from
Harness Problem

nal 

No.

Output

Voltage
(V)

Open
Circuit

Short-
circuit

Harness Problem

17

Input/
Output

M–BUSY (AUDIO)

Hi: 4 – 5
Lo: 0 – 1

f

f

Audio display dose not appear. Panel
switch cannot be operated for audio
unit. Nighttime illumination dose not
appear for audio unit.

18

–

SHIELD–GND

–

–

–

–

19 – 22

–

–

–

–

–

–

23

Input

EX–TEMP

f

f

Outside air temperature does not
appear.

24

Input

ILL+

Hi: 
System
voltage

f

–

Nighttime illumination does not ap-
pear for any navigation system units.

voltage
Lo: 0 – 1

–

f

Blown multipurpose fuse.

25

Input

ACC (ACC power
supply)

System
voltage

f

–

Screen display does not appear.

supply)

voltage

–

f

Blown multipurpose fuse.

26

Input

+B

System
voltage

f

–

Screen display does not appear.

voltage

–

f

Blown multipurpose fuse.

27

Input

VSS

f

–

No effect.

28

–

GND (Ground)

–

f

–

Screen display does not appear.

29, 30

–

–

–

–

–

–

31

–

GND–TEMP

–

f

f

Outside air temperature does not
appear.

32

–

ILL–

–

–

–

–

33

Input

FUEL GAUGE

–

f

f

Abnormal cruising distance display.

34, 35

–

–

–

–

–

–

36

Input

IG1

System
voltage

f

–

Communication with engine-ECU is
not possible.
Driving data values displayed are
abnormal.

–

f

Communication with engine-ECU is
not possible.
Driving data values displayed are
abnormal.
Blown multipurpose fuse.