Mitsubishi Lancer (4A9 engine). Manual - part 161

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-306

Inspection Procedure 1: Power of the radio and CD player does not turn ON when the ignition switch 
is in the "ACC" position or "ON" position. <Vehicles with Auto Stop & Go (AS&G) System>

CAUTION

Before replacing the radio and CD player, ensure that the power supply circuit, the earth circuit and 
the communication circuit are normal.

Radio and CD Player Power Source Circuit

ETACS-
ECU

CAN 
COMMUNICATION LINE

ETACS-ECU

INPUT SIGNAL

IGNITION 
SWITCH (ACC)

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

FUSIBLE 
LINK

38

FUSIBLE 
LINK

36

ENGINE 
COMPARTMENT

RELAY BOX

NOTE

:
:

PETROL
DIESEL

RADIO AND CD PLAYER

DC/DC CONVERTER

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-307

OPERATION
When the ignition switch is in the ON or ACC posi-
tion, the radio and CD player power can be turned 
ON. With the radio and CD player power ON, when 
the ignition switch is turned to the OFF position, the 
power for radio and CD player is also turned OFF.

COMMENTS ON TROUBLE SYMPTOM
Provided that the audio diagnosis code is not set, if 
the power for radio and CD player cannot be turned 
ON, the radio and CD player, or power supply circuit 
for radio and CD player may have a problem, or the 
option coding information may be inconsistent.
NOTE: From the fusible link to C-128 intermediate 
connector, the Radio and CD player uses the same 
power supply circuit as that of AUDIO display (centre 
panel unit). Therefore, check first if the AUDIO dis-
play (centre panel unit) is displayed. If the AUDIO 
display (centre panel unit) is not displayed, carry out 
in advance the troubleshooting of "The radio and CD 
player does not operate normally by operating the 
audio control unit of the centre panel unit". (Refer to 
.)

PROBABLE CAUSES

• Malfunctions of radio and CD player

• Malfunction of the ETACS-ECU

• Malfunction of the DC/DC converter

• Option coding information inconsistency

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. ETACS-ECU coding data check
(1) Operate the M.U.T.-III to read the ETACS-ECU 

option coding information (Refer to GROUP 00 

− 

Coding Table ).

(2) Check that the "AUDIO" is set to "Present."

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Operate the M.U.T.-III to set the option 
coding "AUDIO" to "Present," and check the 
trouble symptom.

STEP 2. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set to the ETACS-
ECU.

Q: Is the check result normal?

YES : 

Troubleshoot the ETACS-ECU. Refer to 

ETACS-ECU 

− Troubleshooting .

NO : 

Go to Step 3.

ACA00892

Connectors: C-65, C-103 <LHD>

AE

C-65 (GR)

C-103

ACA00895AF

Connector: C-65, C-103 <RHD>

C-103

C-65 (GR)

ACA00886

AS

Connectors: C-307, C-311 <LHD>
ETACS-ECU

C-307

C-311

ACA00887

AS

Connectors: C-307, C-311 <RHD>
ETACS-ECU

C-311

C-307

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-308

STEP 3. M.U.T.-III other system data list
Check the input signal of ACC relay.

• Turn the ignition switch to the ACC position.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to ETACS 

− Input Signal Procedure 1 

"The ignition switch (ACC) signal is not sent 
to the ETACS-ECU" .

STEP 4. Connector check: C-103 radio and CD 
player connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Voltage measurement at C-103 radio and 
CD player connector.
(1) Disconnect the connector, and measure at the 

wiring harness-side connector.

(2) Voltage between C-103 radio and CD player 

connector terminal No.30 and the body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Go to Step 6.

STEP 6. Connector check: C-65 DC/DC converter 
connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

STEP 7. Voltage measurement at C-65 DC/DC 
converter connector.
(1) Disconnect C-65 DC/DC converter connector, 

and measure at the wiring harness side.

(2) Measure the voltage between terminal No.9 and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 10.

STEP 8. Check the DC/DC converter.
Check the continuity of the DC/DC converter (Refer 
to ).

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Replace the DC/DC converter.

STEP 9. Check the wiring harness between C-65 
DC/DC converter connector terminal No.1 and C-
103 radio and CD player connector terminal No. 
30.

• Check the power supply line for open circuit and 

short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate C-128 connector, and repair if neces-
sary.

Q: Is the check result normal?

YES : 

Go to Step 11

NO : 

Repair the wiring harness.

STEP 10. Check the wiring harness between C-65 
DC/DC converter terminal No.9 and fusible link 
(36) <Petrol> or (38) <Diesel>.

• Check the power supply line for open circuit and 

short circuit.

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 ).

NO : 

Repair the wiring harness.

STEP 11. Check the wiring harness between C-
103 radio and CD player connector terminal 
No.30 and fusible link (36) <Petrol> or (38) 
<Diesel>

• Check the power supply line (battery power sup-

ply) for open circuit and short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate C-31, C-128 connector and ETACS-
ECU connector C-307 and C-311, and repair if nec-
essary.

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the wiring harness.

Item No.

Item name

Normal 
condition

Item 288

ACC switch

ON

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-309

STEP 12. Check that the radio and CD player is 
correctly earthed the radio and CD player should 
be connected to the earth with an assembly 
screw.

Q: Is the radio and CD player correctly grounded?

YES : 

Go to Step 13.

NO : 

Securely install and earth the radio and CD 
player.

STEP 13. 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 ).

NO : 

Replace the radio and CD player.