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>