Mitsubishi Lancer (4A9 engine). Manual - part 168

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-334

STEP 6. 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 7.

NO : 

Go to Step 9.

STEP 7. 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 8.

NO : 

Replace the DC/DC converter.

STEP 8. Check the wiring harness between C-65 
DC/DC converter connector terminal No.7 and C-
10 centre panel unit connector terminal No. 7.

• 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 10.

NO : 

Repair the wiring harness.

STEP 9. 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 10. Check the wiring harness between C-10 
centre panel unit connector terminal No.7 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 : 

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. Connector check: C-105 radio and CD 
player connector

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the defective connector.

STEP 12. Check the wiring harness between C-
105 radio and CD player connector terminal No.8, 
18 and C-10 centre panel unit connector terminal 
No.1, 2.

• Check the communication lines for open circuit 

and short circuit.

Q: Is the check result normal?

YES : 

Go to Step 13.

NO : 

Repair the wiring harness.

STEP 13. Replace the centre panel unit 
temporarily, and check the trouble symptom.
Replace the centre panel unit temporarily, and check 
that the audio works normally.

Q: Is the check result normal?

YES : 

Replace the centre panel unit.

NO : 

Replace the radio and CD player.

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-335

Inspection Procedure 5: Audio illuminations does not work normally.

CAUTION

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

Centre Panel Unit Communication Circuit

CENTRE PANEL 
UNIT

AUDIO SWITCH PANEL

RADIO AND CD PLAYER

LCD PANEL (AUDIO, CLOCK)

INTERFACE 
CIRCUIT

INTERFACE 
CIRCUIT

CPU

A/C 
CONTROL 
PANEL

COMBINATION METER

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

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-336

OPERATION

• When the position lamp 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 centre panel unit, radio and CD player, combina-
tion meter, or communication line from the centre 
panel unit to the radio and CD player or to the combi-
nation meter may have a problem.

PROBABLE CAUSES

• Malfunction of combination meter

• Malfunctions of centre panel unit

• Malfunctions of radio and CD player

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Operation check of the centre panel unit
Operate the audio control switch of the centre 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 
audio control unit of the centre panel unit." .

STEP 2. Check the combination meter.
Check whether the combination meter works nor-
mally.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Diagnose the combination meter (Refer to ).

STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the combination 
meter.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to ).

NO : 

Go to Step 4.

STEP 4. Connector check: C-01 combination 
meter connector, C-10 centre panel unit 
connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector concerned.

STEP 5. Check the wiring harness between C-01 
combination meter connector terminal No.23 and 
C-10 centre panel unit connector terminal No.16.
NOTE: Prior to the wiring harness inspection, check 
A/C control panel connector C-119, and repair if nec-
essary.

• Check the communication lines for open circuit 

and short circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 6. Connector check: C-119 A/C control 
panel connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the connector concerned.

AC701093 AU

Connector: C-01 <LHD>

AC701122 CI

C-01

Connectors: C-01, C-10, C-105, C-119 <RHD>

C-10

C-105

C-119

AC701094

Connectors: C-10, C-105, C-119 <LHD>

BA

C-10

C-105

C-119

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-337

STEP 7. Check the wiring harness between C-01 
combination meter connector terminal No. 22 
and C-119 A/C control panel connector terminal 
No.8.

• Check the communication lines for open circuit 

and short circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

STEP 8. Check the wiring harness between C-10 
centre panel unit connector terminal No.10 and 
C-119 A/C control panel connector terminal 
No.10.

• Check the communication lines for open circuit 

and short circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

STEP 9. Connector check: C-105 radio and CD 
player connector

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the connector concerned.

STEP 10. Check the wiring harness between C-
105 radio and CD player connector terminal No.9 
and C-10 centre panel unit connector terminal 
No.4.

• Check the communication line for open circuit 

and short circuit.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the wiring harness.

STEP 11. Replace the A/C control panel 
connector temporarily, and check the trouble 
symptom.
Replace the A/C control panel connector temporarily, 
and check that the audio illumination works normally.

Q: Is the check result normal?

YES : 

Replace the A/C control panel connector.

NO : 

Go to Step 12.

STEP 12. Replace the centre panel unit 
temporarily, and check the trouble symptom.
Replace the centre panel unit temporarily, and check 
that the audio illumination works normally.

Q: Is the check result normal?

YES : 

Replace the centre panel unit.

NO : 

Replace the radio and CD player.