Mitsubishi Evolution X. Manual - part 996

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-345

OPERATION

• When the position light is illuminated, the audio 

illumination is switched to the nighttime illumina-
tion.

• When the brightness is adjusted using the combi-

nation meter rheostat switch, the audio illumina-
tion brightness is also adjusted.

.

COMMENTS ON TROUBLE SYMPTOM

The center panel unit, radio and CD player, combina-
tion meter, or communication line from the radio and 
CD player to the combination meter may have a 
problem.

.

PROBABLE CAUSES

• The combination meter may be defective.

• The radio and CD player may be defective.

• The center panel unit may be defective.

• Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Operation check of the center panel unit
Operate the audio control switch of the center panel unit, and 
check if the audio operates normally.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure 4 "The audio does not 

operate normally by operating the radio and CD 
player of the center panel unit." 

P.54A-340

.

STEP 2. Check the combination meter.
Check whether the combination meter works normally.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Diagnose the combination meter (Refer to 

P.54A-28

).

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-346

STEP 3. Using scan tool MB991958, read the combination 
meter diagnostic trouble code.
Check again if the DTC is set to the combination meter.

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 scan tool MB991958. Refer to "How to connect 

scan tool 

P.54A-285

".

(2) Turn the ignition switch to the "ON" position.
(3) Check for combination meter DTCs.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the combination meter (Refer to 

P.54A-28

).

NO :  Go to Step 4.

STEP 4. Check center panel unit connector C-124 and 
combination meter connector C-04 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are center panel unit connector C-124 and combination 

meter connector C-04 in good condition?
YES : Go to Step 5.
NO :  Repair the connector concerned.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-347

STEP 5. Check the wiring harness between center panel 
unit connector C-124 (terminal 10, 16) and combination 
meter connector C-04 (terminal 22, 23).

• Check the communication lines for open circuit and short 

circuit.

NOTE: Also check A/C control panel connector C-123 and joint 
connector C-101 for loose, corroded, or damaged terminals, or 
terminals pushed back in the connector. If iA/C control panel 
connector C-123 and joint connector C-101 is damaged, repair 
or replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between center panel unit 

connector C-124 (terminal 10, 16) and combination 
meter connector C-04 (terminal 22, 23) in good 
condition?
YES : Go to Step 6.
NO :  Repair the wiring harness.

STEP 6. Check radio and CD player connector C-109 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is radio and CD player connector C-109 in good 

condition?
YES : Go to Step 7.
NO :  Repair the connector concerned.

STEP 7. Check the wiring harness between center panel 
unit connector C-124 (terminal 4) and radio and CD player 
connector C-109 (terminal 9).

• Check the communication lines for open circuit and short 

circuit.

Q: Is the wiring harness between center panel unit 

connector C-124 (terminal 4) and radio and CD player 
connector C-109 (terminal 9) in good condition?
YES : Go to Step 8.
NO :  Repair the wiring harness.

STEP 8. Replace the center panel unit temporarily, and 
check the trouble symptom.
Replace the center panel unit temporarily, and check that the 
audio illumination works normally.
Q: Is the check result normal?

YES : Replace the center panel unit.
NO :  Replace the radio and CD player.

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-348

Inspection Procedure 6: The sound of external input are not played.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communi-
cation circuit are normal.

.

COMMENTS ON TROUBLE SYMPTOM

If the external input sound is not output, the radio and 
CD player, audio communication line of radio and CD 
player, or audio adapter may have a problem.

.

PROBABLE CAUSES

• The audio adapter may be defective.

• The radio and CD player may be defective.

• Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

STEP 1. Check the Radio and CD player.
Check that the Radio and CD player operates normally, and the 
sound is output.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Troubleshoot the radio and CD player (Refer to 

P.54A-317

).

Audio and Video Adapter Communication Circuit

AUDIO
ADAPTER

RADIO AND CD
PLAYER

AC708951BI

C-109

C-125 (B)

Connectors: C-109, C-125