Mitsubishi Galant 9G. Manual — part 1570
RADIO WITH CD PLAYER
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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
RADIO WITH CD PLAYER
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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
. 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
.
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
. 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
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