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.
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