Mitsubishi Montero Sport (2004+). Manual - part 509

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-23

STEP 5. Check the driver's side door switch connector 
E-33 input circuit 

(1) Disconnect the driver's side door switch connector E-33 and 

the harness side.

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

• The measured value should be approximately 5 volts.

Q: Does the measured voltage correspond with this range?

YES : There is no action to be taken.
NO :  Go to Step 6.

STEP 6. Check driver's side door switch connector E-33 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

Q: Is driver's side door switch connector E-33 in good 

condition?
YES : Go to Step 7.
NO :  Repair them. Then check that the malfunction is 

eliminated.

AC202056

2 1

COMPONENT SIDE

CONNECTOR: E-33

AB

E-33

AC002735

E-33 HARNESS CONNECTOR: 
COMPONENT SIDE

AD

AC202056

2 1

COMPONENT SIDE

CONNECTOR: E-33

AB

E-33

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-24

STEP 7. Check the harness wires between the driver's side 
door switch connector E-33 (terminal No.2) and 
ETACS-ECU connector D-11 (terminal No.9).

AC201940

2 1

8

19

7

6

5

16

15

17 18

4

3

2

10 11 12 13

1
9

14

CONNECTORS: E-33, E-42

AC

E-33 (B)

E-42

COMPONENT SIDE

E-42

AC201939

1

3

4

7 6 5

2

9

11

12

10

13

8

1
8

3

4

5

7 6

10

15

16

14

12

13

11

9

2

CONNECTORS: D-11, D-14

D-11

D-14 (B)

D-11 COMPONENT SIDE

D-14 COMPONENT SIDE

AB

JUNCTION BLOCK
 (FRONT)

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-25

NOTE: After inspecting intermediate connector E-42, junction 
block D-14, inspect the wire. If intermediate connector E-42, 
junction block D-14 are damaged, repair or replace them. Refer 
to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Are the harness wires between the driver's side door 

switch connector E-33 (terminal No.2) and ETACS-ECU 
connector D-11 (terminal No.9) in good condition?
YES : Replace the ETAS-ECU.
NO :  Go to Step 8.

STEP 8. Recheck for malfunction.
Q: Is a 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 

− How to 

Cope with Intermittent Malfunction 

P.00-7

.)

NO :  Go to Step 1.

INSPECTION PROCEDURE 3: The Ignition Key Hole Illumination Light does not Go out when the 
Ignition Key is Turned to the "ON" Position. (However, it Goes out after 15 Seconds.) The Ignition Key 
Reminder Tone Alarm does not Stop Sounding when the Ignition Key is Turned to the "ON" Position 
(The Tone Alarm Stops Sounding by Closing the Driver's Door.)

.

CIRCUIT OPERATION
Refer to Inspection Procedure 1 

P.54-11

 for the cir-

cuit operations other than those below.

• When the driver's door is opened without remov-

ing the ignition key, the tone alarm will sound 
intermittently to remind that the ignition key has 
not been removed.

.

TECHNICAL DESCRIPTION (COMMENT)
The input signal from the ignition switch may be 
defective, or the ETACS-ECU may be defective. If 
the fuse No.1 in relay box is blown, the harness may 
be short circuited.

.

TROUBLESHOOTING HINTS

• Damaged harness wire or connector

• Malfunction of the ETACS-ECU

.

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-26

DIAGNOSIS

Required Special Tools:

• MB991529: Diagnostic Trouble Code Check Harness

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B (Vehicles without 

CAN communication system)

STEP 1. Check the input signal (by using pulse check).

Check the ETACS-ECU input signal (ignition switch position 
signal) by using scan tool MB991958.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Check that the tone alarm of scan tool MB991958 sounds 

when the ignition key is moved from the "LOCK" position to 
the "ON" position.

Q: Does the tone alarm of scan tool MB991958 sound when 

the input signal enters?
YES : Replace the ETACS-ECU. Check that the malfunction 

is eliminated.

NO :  Go to Step 3.

STEP 2. Check the input signal from the ignition switch (by 
using a voltmeter).

Check the input signals from the following switches:
(1) Use special tool MB991529 to connect a voltmeter between 

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the 

data link connector.

(2) Check that the voltmeter indicator deflects once when the 

ignition key is moved from the "LOCK" position to the "ON" 
position.

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU. Check that the malfunction 

is eliminated.

NO :  Go to Step 3.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC003527

GROUNDED TERMINAL

ETACS-ECU 
TERMINAL

MB991529

AB