Mitsubishi Evolution X. Manual - part 991

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-325

(3) Measure the resistance between terminal 31 and ground.

OK: The resistance should be 2 ohms or less

(4) Measure the resistance between terminal 32 and ground.

OK: The resistance should be 2 ohms or less

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.
NO :  Go to Step 4.

STEP 4. Check the wiring harness between audio amplifier 
connector D-29 (terminal 24, 31, 32) and ground.

• Check the ground wires for open circuit.

Q: Is the wiring harness between audio amplifier connector 

D-25 (terminal 24, 31, 32) and ground in good condition?
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 :  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 5. Check the power supply circuit to the audio 
amplifier. Measure the voltage at audio amplifier connector 
D-29.
(1) Disconnect audio amplifier connector D-29, and measure 

the voltage available at the wiring harness-side connector.

(2) Measure the voltage between terminal 25 and ground.

OK:Battery voltage.

AC709322 AU

Harness side: D-29

AC709322 AV

Harness side: D-29

AC709325 AE

Harness side: D-29

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-326

(3) Measure the voltage between terminal 35 and ground.

OK:Battery voltage.

(4) Measure the voltage between terminal 36 and ground.

OK: Battery voltage.

Q: Is the measured voltage battery voltage?

YES : Go to Step 7.
NO :  Go to Step 6.

STEP 6. Check the wiring harness between audio amplifier 
connector D-29 (terminal 25, 35, 36) and fusible link (36).

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

cuit.

NOTE: Also check intermediate connector C-47 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-47 is damaged, repair or 
replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between audio amplifier connector 

D-29 (terminal 25, 35, 36) and fusible link (36) 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 radio and CD player connector C-109 and 
audio amplifier connector D-30 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are radio and CD player connector C-109 and audio 

amplifier D-30 in good condition?
YES : Go to Step 8.
NO :  Repair or replace the damaged component(s) (Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

).

AC709325 AF

Harness side: D-29

AC709325 AG

Harness side: D-29

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

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STEP 8. Check the wiring harness between radio and CD 
player connector C-109 (terminal 17) and audio amplifier 
connector D-30 (terminal 3), and between radio and CD 
player connector C-109 (terminal 7) and audio amplifier 
connector D-29 (terminal 34).

• Check the communication lines for open circuit and short 

circuit.

NOTE: Also check intermediate connector C-24 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-24 is damaged, repair or 
replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between radio and CD player 

connector C-109 (terminal 17) and audio amplifier 
connector D-30 (terminal 3), and between radio and CD 
player connector C-109 (terminal 7) and audio amplifier 
connector D-29 (terminal 34)?
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
Replace the audio amplifier, then check that the audio sound is 
output.
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.

RADIO AND CD PLAYER

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CHASSIS ELECTRICAL

54A-328

Inspection Procedure 3: No sound is heard from one of the speakers. <Vehicles without audio 

amplifier>

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communi-

cation circuit are normal.

Speaker System Circuit

TWEETER
(RH)

RADIO AND CD PLAYER

JOINT 
CONNECTOR (1)

REAR DOOR
SPEAKER (LH)

REAR DOOR
SPEAKER (RH)

FRONT DOOR
SPEAKER (RH)

FRONT DOOR
SPEAKER (LH)

TWEETER
(LH)