Mitsubishi 380. Manual - part 941

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-298

INSPECTION PROCEDURE 5: On the Audio Screen, "COMMUNICATION ERROR" can not Proceed to 
Next Screen.

.

CIRCUIT OPERATION

The multi-centre display unit  receives information 
from the radio, CD player and CD changer via M bus 
communication to display the audio system operation 
condition.

.

TECHNICAL DESCRIPTION (COMMENT)

The audio system operation screen will be frozen if 
the multi-centre display  have received abnormal 
data from the radio, CD player and CD changer via 
M-bus communication within 30 seconds. If the 
abnormal data is received further 30 seconds from 
that point, a message "COMMUNICATION ERROR" 
will be displayed.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• Malfunction of multi-centre display unit 

• Malfunction of radio, CD player and CD changer

• 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

STEP 1. Check the communication condition by 
self-diagnostic function.
1.Start up the service mode to check the communication condi-
tion (Refer to 

P.54A-246

). 

Q: Is "NG" displayed as the check results for M-bus 

communication?
YES : Go to Step 2.
NO :  Go to Step 4.

16DB554A

CONNECTORS: C-05, C-117

C-05 (B)

C-117

Communication check result

M-BUS             : OK

CAN-BUS        : OK

AC208700 AC

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-299

STEP 2. Check radio, CD player and CD changer connector 
C-117 and multi-centre display unit  connector C-05 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is radio, CD player and CD changer connector C-117 

and multi-centre display unit  connector C-05 in good 
condition?
YES : Go to Step 3.
NO :  Repair or replace the component(s). Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Then go 

to step 1.

STEP 3. Check the wiring harness between radio, CD 
player and CD changer connector C-117 (terminal 46, 42, 
41 and 47) and multi-centre display unit  connector C-05 
(terminal 7, 8, 9 and 10).
Q: Is the wiring harness between radio, CD player and CD 

changer connector C-117 (terminal 26, 22, 21 and 27) 
and multi-centre display unit  connector C-05 (terminal 
7, 9, 8 and 10) in good condition?
YES : Go to Step 4.
NO :  Repair the wiring harness and then go to step 1.

16DB555A

CONNECTORS: C-05, C-117

C-05 (B)

C-117

HARNESS SIDE

C-05

C-117

16DB555A

CONNECTORS: C-05, C-117

C-05 (B)

C-117

HARNESS SIDE

C-05

C-117

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-300

STEP 4.Using the oscilloscope, check the M BUS line.
(1) Connect the multi-centre display unit  connector C-05 and 

radio, CD player and CD changer connector C-117.

(2) Connect the oscilloscope probe to terminal 10 of the 

multi-centre display unit  connector by backprobing.

(3) Turn the ignition switch to “ACC” position.
(4) Operate each of the radio, CD player and CD changer 

switches.

Q: Is a wave pattern displayed?

YES : Intermittent malfunction (Refer to GROUP 00, How to 

Use Troubleshooting/Inspection Service Points - How 
to Cope with Intermittent malfunction 

P.00-14

.

NO :  Replace multi-centre display unit  and then go to Step 

6. 

STEP 5. Retest the system
Confirm that the audio operation screen is displayed normally.

Q: Is the check result satisfactory?

YES : The procedure is complete.
NO :  Replace radio, CD player and CD changer and then 

go to step 6.

STEP 6. Retest the system
Confirm that the audio operation screen is displayed normally.

Q: Is the check result satisfactory?

YES : The procedure is complete.
NO :  Go to step 1.

16DB556A

C-05 HARNESS CONNECTOR:

OSCILLOSCOPE 
PROBE

OSCILLOSCOPE 

MULTI-CENTER DISPLAY

CHASSIS ELECTRICAL

54A-301

ON-VEHICLE SERVICE

AMBIENT AIR TEMPERATURE UNIT 
CUSTOMIZATION

M1543017800020

When you press the function button switch on the multi-centre 
display, the measurement unit, which is used for the ambient 
air temperature display, can be changed from centigrade to 
Fahrenheit, or vice versa.
1. Call up "Display customization" screen, and choose "Units"  

by pressing function button switch 2. Then press function 
button switch 3 (SELECT).

2. Ensure that "Outside temperature unit" is chosen from the 

"Customization units" screen, and then press function button 
switch 3 (SELECT).

3. By pressing the function button switch 2, you can select the 

unit you wish (

°C to °F). Then press function button switch 3 

(SELECT).

NOTE: If you reconnect the battery cables, the display returns 
to the default unit (

°C).

16DB557A

16DB558A

16DB559A