Mitsubishi L200. Manual - part 720

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-247

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.

PROBABLE CAUSES

• Malfunction of radio and CD player

• Malfunction of audio amplifier

• Malfunction of speaker or tweeter

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-30, D-31 audio 
amplifier connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

AUDIO AMPLIFIER

RADIO AND CD PLAYER

Audio Amplifier System Circuit

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

AC903885AB

Connectors: D-30, D-31 <LHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC903886 AB

Connectors: D-30, D-31 <RHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-248

STEP 2. Resistance measurement at D-30, D-31 
audio amplifier connector

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between D-30 audio 

amplifier connector terminal No.33 and the body 

earth.

OK: Continuity exists (2 

Ω or less)

(3) Measure the resistance between D-30 audio 

amplifier connector terminal No.34 and the body 
earth.

OK: Continuity exists (2 

Ω or less)

(4) Measure the resistance between D-31 audio 

amplifier connector terminal No.3 and the body 
earth.

OK: Continuity exists (2 

Ω or less)

(5) Measure the resistance between D-31 audio 

amplifier connector terminal No.4 and the body 
earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

AC903885AB

Connectors: D-30, D-31 <LHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC903886 AB

Connectors: D-30, D-31 <RHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC711483 AL

Connector D-30 
(Harness side)

AC711483AM

Connector D-30 
(Harness side)

AC711483 AJ

Connector D-31 
(Harness side)

AC711483AK

Connector D-31 
(Harness side)

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-249

STEP 3. Check the wiring harness between the D-
30 audio amplifier connector terminal No.33, 34 
or D-31 audio amplifier connector terminal No.3, 
4 and the body earth

• Check the earth wires for open circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-59, joint connectors C-137 
and C-138, and repair if necessary.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

STEP 4. Voltage measurement at D-31 audio 
amplifier connector

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Voltage between D-31 audio amplifier connector 

terminal No.5 and the body earth

OK: System voltage

(3) Voltage between D-31 audio amplifier connector 

AC903885AB

Connectors: D-30, D-31 <LHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC903886 AB

Connectors: D-30, D-31 <RHD>

D-30

Harness side

D-31

Harness side

D-30

D-31

AC903885AC

Connector: D-31 <LHD>

Harness side

AC903886 AC

Connector: D-31 <RHD>

Harness side

AC711484AF

Connector D-31 
(Harness side)

AC711484AG

Connector D-31 
(Harness side)

RADIO AND CD PLAYER

CHASSIS ELECTRICAL

54A-250

terminal No.6 and the body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

STEP 5. Check the wiring harness between D-31 
audio amplifier connector terminal No.5, 6 and 
fusible link No.23.

• Check the power supply lines for open circuit and 

short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connectors C-16, C-13 <LHD> and C-
14 <RHD>, and repair if necessary.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 6. Connector check: C-125 radio and CD 
player connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

AC903885AC

Connector: D-31 <LHD>

Harness side

AC903886 AC

Connector: D-31 <RHD>

Harness side

AC903856AE

Harness side

Connector: C-125 <LHD>

AC903868

AE

Harness side

Connector: C-125 <RHD>