Mitsubishi Grandis. Manual - part 23

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-89

DIAGNOSTIC PROCEDURE

Step 1. Connector check: C-219 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

Step 2. Voltage measurement at the C-219 
ETACS-ECU connector.

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Voltage between C-219 ETACS-ECU connector 

terminal No.20 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC301541IE

Connector C-219
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-90

Step 3. Check the wiring harness between C-219 
ETACS-ECU connector terminal No.20 and 
fusible link (26).

NOTE: 

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC310614

AZ

Connectors: C-31, C-125 <LHD>

C-125

C-125

C-31

C-31

AC310628

Connector: C-125 <RHD>

AR

AC310623

Connectors: C-203 <LHD>

AL

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC310618

Connectors: C-203 <RHD>

AK

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-91

Prior to the wiring harness inspection, check 
intermediate connector C-125 and joint connector 
C-31 <LH drive vehicles>, junction block connector 
C-203, and repair if necessary.

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Repair the wiring harness.

Step 4. Resistance measurement at the C-219 
ETACS-ECU connector.

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Continuity between C-219 ETACS-ECU 

connector terminal No.3 and body earth.

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

Step 5. Check the wiring harness between C-219 
ETACS-ECU connector terminal No.3 and body 
earth.

NOTE: 

Prior to the wiring harness inspection, check junction 
block connector C-205, and repair if necessary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC310506

Connector C-219 
(Junction block side)

AV

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC310623

Connector: C-205 <LHD>

AM

Harness side

Junction block (Front view)

AC310618

Connectors: C-205 <RHD>

AL

Harness side

Junction block (Front view)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-92

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Repair the wiring harness.

Step 6. Retest the system.

Check that the battery power supply circuit to the 
ETACS-ECU is normal.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Replace the ETACS-ECU.

TONE ALARM

Inspection Procedure B-1: Lamp reminder buzzer function does not work normally.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU operates this function in 
accordance with the input signals below.

• Ignition switch (IG1)

• Driver's door switch

• Tail lamp switch

• Headlamp switch

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may be 
defective.

POSSIBLE CAUSES

• Malfunction of the driver's door switch

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK 
(OFF) position, check if the hazard warning lamps 
illuminate.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure A-2 "Check 
the ETACS-ECU battery power supply 
circuit 

P.54B-87

."

ETACS-ECU

INPUT SIGNAL

· DRIVER'S DOOR SWITCH

· TAIL LAMP SWITCH

· IGNITION SWITCH (IG1)

· HEADLAMP SWITCH

Lamp Reminder Buzzer Function