Mitsubishi Galant. Manual — part 646

RADIO WITH TAPE PLAYER AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-137

STEP 4. Check that proper performance is
obtained when the vehicle is moved.

Q: Is proper performance obtained when the vehicle

is moved?
YES :

The auto-select function should operate

normally.

NO :

Go to Step 5.

STEP 5. Check that the antenna plug is
connected to the radio properly.

Q: Is the antenna plug connected to the radio

properly?
YES :

Go to Step 6.

NO :

The antenna plug is reconnected to the
radio properly. The auto-select function
should operate normally.

STEP 6. Check that the problem disappears when
another radio is used.

Q: Does the problem disappear if another radio is

used?
YES :

Repair or replace the radio. The auto-select

function should operate normally.

Inspection Procedure 19: Preset station are erased.

AC003979AB

Memory Backup Power Supply Circuit

TSB Revision

CHASSIS ELECTRICAL

RADIO WITH TAPE PLAYER AND CD PLAYER

54A-138

CIRCUIT OPERATION
The power is constantly supplied to the radio, tape
player, CD player and CD auto changer.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a faulty radio, tape player, CD
player and CD auto changer memory backup power
supply circuit system.

TROUBLESHOOTING HINTS

•

Damaged harness wire or connector.

•

Malfunction of the radio, tape player, CD player
and CD auto changer.

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness set

STEP 1. Check the radio, tape player, CD player and CD
auto changer memory backup power supply circuit by
back probing.
(1) Do not disconnect radio, tape player, CD player and CD

auto changer connector C-31.

(2) Measure the voltage between terminal number 11 and

ground by backprobing.

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Repair or replace the radio, tape player, CD player

and CD auto changer. Check that a memory is
retained.

NO : Go to Step 2 .

AC003089

CONNECTOR: C-31

AT

AC003079 AB

CONNECTOR
BLOCK (LH)

CONNECTOR: C-66

AC003082AY

CONNECTOR: C-74

JUNCTION BLOCK
(FRONT VIEW)

AC003080 AB

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-84

1

2

3

4

5

6

7

8

9

10

11

12

13

14

ACX01870AC

CONNECTOR C-31

(HARNESS SIDE)

RADIO WITH TAPE PLAYER AND CD PLAYER

TSB Revision

CHASSIS ELECTRICAL

54A-139

STEP 2. Check harness connector C-31 at the radio, tape
player, CD player and CD auto changer for damage.
Q: Is harness connector C-31 in good condition?

YES : Go to Step 3 .
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Check that a memory

is retained.

AC003089

CONNECTOR: C-31

AT

TSB Revision

CHASSIS ELECTRICAL

RADIO WITH TAPE PLAYER AND CD PLAYER

54A-140

STEP 3. Check the harness wires between radio, tape
player, CD player connector C-31and battery.
NOTE: After inspecting intermediate connector C-66 and
junction block connectors C-74 and C-84, inspect the wire. If
intermediate connector C-66 and junction block connectors C-
74 and C-84 are damaged, repair or replace them. Refer to
GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Are the harness wires between the connector C-31 and

battery in good condition?
YES : Repair them. Check that a memory is retained.
NO : Repair or replace the radio, tape player, CD player.

Check that a memory is retained.

AC003089

CONNECTOR: C-31

AT

AC003079 AB

CONNECTOR
BLOCK (LH)

CONNECTOR: C-66

AC003082AY

CONNECTOR: C-74

JUNCTION BLOCK
(FRONT VIEW)

AC003080 AB

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-84