Mitsubishi Evolution X. Manual — part 990

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-321

STEP 6. Check the wiring harness between ETACS-ECU
connector C-317 (terminal 1) and radio and CD player
connector C-107 (terminal 30).

• Check the power supply lines (battery power supply) for

open circuit and short circuit.

Q: Is the wiring harness between ETACS-ECU connector

C-317 (terminal 1) and radio and CD player connector
C-107 (terminal 30) in good condition?
YES : Go to Step 7.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

STEP 7. Check the power supply circuit to the ETACS-ECU.
Measure the voltage at ETACS-ECU connector C-307.
(1) Disconnect the connector, and measure at the wiring

harness-side connector.

(2) Measure the voltage between terminal 2 and ground.

OK: Battery voltage

Q: Is the measured voltage battery voltage?

YES : Go to Step 9.
NO : Go to Step 8.

STEP 8. Check the wiring harness between ETACS-ECU
connector C-307 (terminal 2) and fusible link (36)

• Check the power supply line for open circuit and short cir-

cuit.

Q: Is the wiring harness between ETACS-ECU connector

C-307 (terminal 2) and fusible link (36) in good
condition?
YES : Go to Step 9.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

STEP 9. Retest the system
Check if the radio and CD player power is turned ON.
Q: Is the check result normal?

YES : 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

).

NO : Replace the radio and CD player.

AC709325 AD

Harness side: C-307

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

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Inspection Procedure 2: No sound is heard. <Vehicles with audio amplifier>

CAUTION

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

Audio Amplifier System Circuit

RELAY
BOX

AUDIO AMPLIFIER

FUSIBLE
LINK

36

RADIO AND CD PLAYER

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

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.

COMMENTS ON TROUBLE SYMPTOM

If the audio sound is not output, the radio and CD
player, audio amplifier, or power supply circuit of
audio amplifier may have a problem, or the option
coding information may be inconsistent.

.

PROBABLE CAUSES

• The radio and CD player may be defective

• The audio amplifier may be defective

• Option coding information inconsistency

• Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• 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

AC708951BE

C-109

C-24

Connectors: C-24, C-109

AC708950

Connector: C-47

AE

AC708954 AR

Connectors: D-29, D-30

D-30

D-29

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

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STEP 1. Check the ETACS-ECU coding data.
(1) Operate the scan tool MB991958 to read the ETACS-ECU

option coding information (Refer to GROUP 00, Coding
Table

P.00-39

).

(2) Check that the "Speaker" is set to "Premium."
Q: Is the check result normal?

YES : Go to Step 2.
NO : Operate scan tool MB991958 to set the option coding

"Speaker" to "Premium," and check the trouble
symptom.

STEP 2. Check audio amplifier connector D-29 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is audio amplifier connector D-29 in good condition?

YES : Go to Step 3.
NO : Repair or replace the damaged component(s) (Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

).

STEP 3. Check the ground circuit to the audio amplifier.
Measure the resistance at audio amplifier connector D-29.
(1) Disconnect audio amplifier connector D-29, and measure

the resistance available at the wiring harness side of the
connector.

(2) Measure the resistance between terminal 24 and ground.

OK: The resistance should be 2 ohms or less

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AC709322 AT

Harness side: D-29