Mitsubishi Evolution X. Manual - part 986

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-305

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set to the radio and CD player.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace the radio and CD player.
NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00, How to use 
Troubleshooting/inspection Service Points, How to 
Cope with Intermittent Malfunction 

P.00-15

).

DTC B2421: Radio tuner

CAUTION

Before replacing the radio and CD player, be sure 
to check that the power supply circuit, ground 
circuit, and communication circuit are normal.

.

TROUBLE JUDGMENT

If the communication cannot be established consec-
utively for 10 times between the incorporated tuner of 
radio and CD player and the microcomputer, the 
diagnostic trouble code is set.

.

COMMENTS ON TROUBLE SYMPTOM

The radio and CD player or CAN bus line may have a 
problem.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The radio and CD player may be defective.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-306

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool MB991958 to diagnose the CAN bus lines.

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 the 

Scan Tool (M.U.T.-III) 

P.54A-285

."

(2) Turn the ignition switch to "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

.) On completion, go to Step 2.

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set to the radio and CD player.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace the radio and CD player.
NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00, How to use 
Troubleshooting/inspection Service Points, How to 
Cope with Intermittent Malfunction 

P.00-15

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-307

DTC B2423: 6CD player error

CAUTION

If there is any problem in the CAN bus lines, an 
incorrect diagnostic trouble code may be set. 
Prior to this diagnosis, always diagnose the CAN 
bus lines.

CAUTION

Before replacing the radio and CD player <CD 
changer built-in type>, be sure to check that the 
power supply circuit, ground circuit, and commu-
nication circuit are normal.

.

TROUBLE JUDGMENT

During the use of the radio and CD player <CD 
changer built-in type>, if any of the ERROR, 
ERROR01, ERROR02, ERROR03, ERROR DC or 
ERROR HOT continues for 1 minute, the diagnostic 
trouble code is set.

.

COMMENTS ON TROUBLE SYMPTOM

The radio and CD player <CD changer built-in type> 
or CAN bus line may have a problem.

.

TROUBLESHOOTING HINTS

• The radio and CD player may be defective.<CD 

changer built-in type>

• The CAN bus line may be defective.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

RADIO AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-308

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool MB991958 to diagnose the CAN bus lines.

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 the 

Scan Tool (M.U.T.-III) 

P.54A-285

."

(2) Turn the ignition switch to "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

STEP 2. CD check
Playback a clean and unscratched CD for one minute, and 
recheck if the diagnostic trouble code is set to the radio and CD 
player.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Playback the clean, unscratched CD for one minute.
(4) Check if diagnostic trouble code is set.
Q: Is the diagnostic trouble code set?

YES : Go to Step 3.
NO :  Clean the CD, use a CD without scratches and burrs, 

or remove the CD burrs, and then reinsert the CD.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB