Mitsubishi Galant 9G. Manual - part 1540

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-32

STEP 2. Check the immobilizer indicator light circuit of 
immobilizer-ECU connector C-124.
(1) Disconnect the immobilizer-ECU connector C-124 and 

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Connect terminal 5 to the ground.
Q: Does only the immobilizer indicator light illuminate? 

(other indicator lights are in good condition)
YES : Replace the immobilizer-ECU. Then register the 

password (secret code) and encrypted code 

P.54A-37

.

NO :  Go to Step 3.

STEP 3. Check immobilizer-ECU connector C-124 and 
combination meter connector C-101 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are immobilizer-ECU connector C-124 and combination 

meter  connector C-101 in good condition?
YES : Go to Step 4.
NO :  Repair or replace the component(s). Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Confirm 

the immobilizer indicator light illuminate normally.

AC305231CQ

CONNECTOR: C-124

HARNESS SIDE

AC306468

AC306468

CONNECTOR C-124 
(HARNESS SIDE)

AG

AC305232

CONNECTORS: C-101, C-124

C-124

C-124

HARNESS SIDE

AX

C-101

HARNESS SIDE

C-101

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54A-33

STEP 4. Check the wiring harness between combination 
meter connector C-101 (terminal 19) and immobilizer-ECU 
connector C-124 (terminal 5).
Q: Is the wiring harness between combination meter 

connector C-101 (terminal 19) and immobilizer-ECU 
connector C-124 (terminal 5) in good condition?
YES : Go to Step 5.
NO :  Repair the wiring harness. Confirm the immobilizer 

indicator light illuminate normally.

STEP 5. Measure the voltage at combination meter 
connector C-101 in order to check the battery circuit of 
power supply system to the combination meter.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Disconnect combination meter connector C-101, and 

measure at the wiring harness side.

(3) Measure the voltage between terminal 1 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES : Go to Step 8.
NO :  Go to Step 6.

AC305232

CONNECTORS: C-101, C-124

C-124

C-124

HARNESS SIDE

AX

C-101

HARNESS SIDE

C-101

AC305231CT

CONNECTOR: C-101

HARNESS SIDE

AC209365

CONNECTOR C-101 
(HARNESS SIDE)

HT

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-34

STEP 6. Check combination meter connector C-101 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is combination meter connector C-101 in good 

condition?
YES : Go to Step 7.
NO :  Repair or replace the component(s). Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Confirm 

the immobilizer indicator light illuminate normally.

STEP 7. Check the wiring harness between combination 
meter connector C-101 (terminal 1) and the battery.

NOTE: Also check intermediate connector C-29 and joint con-
nector C-01 for loose, corroded, or damaged terminals, or ter-
minals pushed back in the connector. If intermediate connector 
C-29 or joint connector C-01 is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between combination meter 

connector C-101 (terminal 1) and the battery in good 
condition?
YES : Go to Step 8.
NO :  Repair the wiring harness. Check to see that all 

meters operate.

AC305231CT

CONNECTOR: C-101

HARNESS SIDE

AC305232

CONNECTORS: C-01, C-29, C-101

C-124

AY

C-01

HARNESS SIDE

C-101

C-29

C-29

C-01

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-35

STEP 8. Retest the system.
Q: Is the malfunction eliminated?

YES : The procedure is complete. (If no malfunctions are 

found in all steps, an intermittent malfunction is 
suspected. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Point 

P.00-14

).

NO :  Replace the combination meter.

DATA LIST REFERENCE TABLE

M1543007300325

CHECK AT IMMOBILIZER-ECU 

M1543007600508

Terminal Voltage Check

MUT-III
SCAN TOOL
DISPLAY

ITEM 
NO.

INSPECTION ITEM

INSPECTION
REQUIREMENT

NORMAL 
CONDITION

REGD.KEY

01

Key has been registered -

Number of registered ignition 
keys

TP LOCK CHECK

02

Determining whether the 
ignition key can be 
registered or not

UNLOCK

Can be overwritten (Correct)

LOCK

Can not be overwritten 
(Incorrect)

AC307447

TERMINAL NO.

SIGNAL

CHECKING 
REQUIREMENT

TERMINAL VOLTAGE

1

Immobilizer-ECU power 
supply

Ignition switch: "LOCK" 
(OFF) 

0V

Ignition switch: "ON" 

Battery positive voltage

2

Immobilizer-ECU ground Always

0V

3

powertrain control 
module

-

-

5

Immobilizer indicator 
light

When immobilizer 
indicator light is 
illuminated

Approximately 5 volts

When immobilizer 
indicator light is not 
illuminated

0V

7

Ignition key ring antenna −

−

8

Ignition key ring antenna −

−