Mitsubishi Lancer (4A9 engine). Manual - part 163

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-314

Speaker System Circuit

AUDIO AMPLIFIER

TWEETER 
(LH)

TWEETER 
(RH)

FRONT DOOR 
SPEAKER (LH)

FRONT DOOR 
SPEAKER (RH)

REAR DOOR 
SPEAKER 
(LH)

REAR DOOR 
SPEAKER 
(RH)

SUB WOOFER

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-315

AUDIO AMPLIFIER

RADIO AND CD PLAYER

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

AC701094

Connector: C-105 <LHD>

BG

AC701122 CH

Connector: C-105 <RHD>

AC612722

AH

Connectors: D-26, D-27

D-26

D-27

AC612730

Connectors: E-02, E-12

AD

E-02 (B)

E-12

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-316

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. In addition, if 
any of the speakers is short-circuited, the protection 
circuit inside the radio and CD player disables all the 
speakers to sound. Therefore, if all the speakers do 
not output sound, the speaker circuit may be shorted 
or the speaker may be defective. Also, the option 
coding information may be inconsistent.

PROBABLE CAUSES

• Malfunction of radio and CD player

• Malfunction of audio amplifier

• Malfunction of speaker or tweeter

• 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 List ).

(2) Check that the "Number of speaker" is set to 

"Premium."

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Operate the M.U.T.-III to set the option 
coding "Number of speaker" to "Number of 
speaker," and check the trouble symptom.

STEP 2. Connector check: D-26, D-27 audio 
amplifier connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Resistance measurement at D-26 audio 
amplifier connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between D-26 audio 

amplifier connector terminal No.24 and the body 
earth.

OK: Continuity exists (2 

Ω or less)

(3) Measure the resistance between D-26 audio 

amplifier connector terminal No.31 and the body 
earth.

OK: Continuity exists (2 

Ω or less)

(4) Measure the resistance between D-26 audio 

amplifier connector terminal No.32 and the body 

AC612731

Connectors: E-04, E-10

AD

E-04 (B)

E-10

AC612733

Connector: E-21

AB

AC612732

Connector: E-22

AB

AC801775 BJ

F-25 (B)

Connector: F-25 <LANCER SPORTBACK>

AC701264 AR

Connector: F-25 <LANCER>

F-25 (B)

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-317

earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check the wiring harness between the D-
26 audio amplifier connector terminal No.24, 31, 
32 and the body earth

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness.

STEP 5. Voltage measurement at D-26 audio 
amplifier connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Voltage between D-26 audio amplifier connector 

terminal No.25 and the body earth

OK: System voltage

(3) Voltage between D-26 audio amplifier connector 

terminal No.35 and the body earth

OK: System voltage

(4) Voltage between D-26 audio amplifier connector 

terminal No.36 and the body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

STEP 6. Check the wiring harness between D-26 
audio amplifier connector terminal No.25, 35, 36 
and fusible link No.36 <petrol> or 38 <diesel>.

• Check the power supply lines for open circuit and 

short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-31, and repair if necessary.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 7. Connector check: C-103, C-105 radio and 
CD player connector

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the defective connector.

STEP 8. Check the wiring harness between C-105 
radio and CD player connector terminal No.7, 17 
and D-26 audio amplifier connector No.34 or D-27 
audio amplifier connector No.3.

• Check the communication line for open circuit 

and short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-17, and repair if necessary.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

STEP 9. Check the following connectors.
Check the following connectors:

• E-12 front door speaker (LH) connector

• E-10 front door speaker (RH) connector

• E-22 rear door speaker (LH) connector

• E-21 rear door speaker (RH) connector

• E-02 tweeter (LH) connector

• E-04 tweeter (RH) connector

• F-25 sub woofer connector

Q: Are all the connectors in good condition?

YES : 

Go to Step 10.

NO : 

Repair the defective connector.

STEP 10. Check the speaker, tweeter or 
subwoofer.
(1) Remove the speaker, tweeter or subwoofer. 

Refer to .

(2) Check that the speaker or tweeter outputs the 

noise when the voltage of 5 V is applied to the 
speaker or tweeter connector terminal. <speaker 
or tweeter>

(3) Check that the subwoofer outputs the noise when 

the voltage of 5 V is applied to the subwoofer 
connector terminal. <subwoofer>

Q: Do the speaker, tweeter or subwoofer output the 

noise?
YES : 

Go to Step 11.

NO : 

Replace the speaker, tweeter or subwoofer.