Mitsubishi Galant 9G. Manual - part 1570

RADIO WITH CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-152

INSPECTION PROCEDURE 5: No Sound. <Vehicles with Audio Amplifier>

.

CIRCUIT OPERATION

Power is supplied from the battery directly to the 
audio amplifier.

.

TECHNICAL DESCRIPTION (COMMENT)

The cause is probably a faulty audio amplifier power 
supply circuit system.

.

TROUBLESHOOTING HINTS

• Damaged wiring harness or connector.

• Malfunction of the audio amplifier.

Audio Amplifier Power Supply Circuit

FUSIBLE 
LINK

5

JUNCTION 
BLOCK

AUDIO AMPLIFIER

RADIO, CD PLAYER AND CD CHANGER

AC305231

CONNECTOR: C-29

AH

AC305233 CE

CONNECTORS: C-113, C-114, C-116

C-116

C-113

C-114

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TSB Revision

CHASSIS ELECTRICAL

54A-153

DIAGNOSIS

Required Special Tool:

• MB991223: Harness set

STEP 1. Measure the voltage at audio amplifier connector 
C-113 in order to check the battery circuit of power supply 
system to the audio amplifier.
(1) Disconnect audio amplifier connector C-113, and measure 

at the wiring harness side.

(2) Measure the voltage between terminal 6 and ground.

• The voltage should measure approximately 12 volts 

(battery positive voltage).

(3) Measure the voltage between terminal 16 and ground.

• The voltage should measure approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 4.
NO :  Go to Step 2.

STEP 2. Check audio amplifier connector C-113 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is audio amplifier connector C-113 in good condition?

YES : Go to Step 3.
NO :  Repair or replace the component(s). Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

speakers should sound.

AC305233CC

CONNECTOR: C-113

HARNESS SIDE

AC204738FK

13

10 9

1

2

1211

3

4

18

8

1514

5

1716

7 6

CONNECTOR C-113 
(HARNESS SIDE)

AC305233CC

CONNECTOR: C-113

HARNESS SIDE

RADIO WITH CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-154

STEP 3. Check the wiring harness between audio amplifier 
connector C-113 (terminal 6 and 16) and the battery.

NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connectors C-29 is damaged, repair 
or replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between audio amplifier connector 

C-113 (terminal 6 and 16) and the battery in good 
condition?
YES : There is no action to be taken.
NO :  Repair the wiring harness. The speakers should 

sound.

STEP 4. Measure the resistance at audio amplifier 
connector C-113 in order to check the ground circuit to the 
audio amplifier.
(1) Disconnect audio amplifier connector C-113, and measure 

at the wiring harness side.

(2) Measure the resistance between terminal 7 and ground.

• The resistance should be 2 ohms or less.

(3) Measure the resistance between terminal 17 and ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 7.
NO :  Go to Step 5.

AC305233CC

CONNECTOR: C-113

HARNESS SIDE

AC305231AI

CONNECTOR: C-29

AC305233CC

CONNECTOR: C-113

HARNESS SIDE

AC204738FL

13

10 9

1

2

1211

3

4

18

8

1514

5

1716

7 6

CONNECTOR C-113 
(HARNESS SIDE)

RADIO WITH CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-155

STEP 5. Check audio amplifier connector C-113 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is audio amplifier connector C-113 in good condition?

YES : Go to Step 6.
NO :  Repair or replace the component(s). Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. The 

speakers should sound.

STEP 6. Check the wiring harness between audio amplifier 
connector C-113 (terminal 7 and 17) and ground.
Q: Is the wiring harness between audio amplifier connector 

C-113 (terminal 7 and 17) and ground in good 
condition?
YES : There is no action to be taken.
NO :  Repair the wiring harness. The speakers should 

sound.

AC305233CC

CONNECTOR: C-113

HARNESS SIDE

AC305233CC

CONNECTOR: C-113

HARNESS SIDE