Mitsubishi Grandis. Manual - part 74

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-293

NOTE: 

AC310631 AD

Connector: C-16 <RHD>

AC310631AL

Connector: C-31 <RHD>

AC310619

Connectors: C-203, C-210 <RHD>

AP

Junction block side

Junction block (Front view)

C-210

C-203

Harness side

C-210

C-203

10

1

6

14

5

12

13

4

11

7

2

3

8

9

AC310220

AC310220

Connector: G-21 <RHD>

AG

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-294

<RH drive vehicles> Prior to the wiring harness 
inspection, check intermediate connector C-16 
<tail/stop lamp (LH) and licence plate lamp>, C-125 
<tail/stop lamp and licence plate lamp>, G-14 
<licence plate lamp>, G-21 <tail/stop lamp (LH)>, 
joint connector C-31 <tail/stop lamp (RH)>, junction 
block connector C-203 <tail/stop lamp (LH)> and 
C-210 <tail/stop lamp (LH)>, and repair if necessary.

• Check the output lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

Step 8. Retest the system.

Check that the tail lamps, the position lamps and the 
licence plate lamps illuminate normally.

Q: Is the check result normal?

The lamps illuminate normally at both high and low 
beams. : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

When the tail/stop lamps do not illuminate : 

Replace the tail/stop lamp socket assembly.

When the position lamps do not illuminate : 

Replace the position lamp socket.

When the licence plate lamps do not illuminate : 

Replace the licence plate lamp socket.

Inspection Procedure M-7: The headlamp(s) do not illuminate.

CAUTION

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

FRONT-ECU

HEADLAMP

(HI: LH)

HEADLAMP

(LO: LH)

HEADLAMP

(LO: RH)

HEADLAMP

(HI: RH)

HEADLAMP 
RELAY: HI

HEADLAMP 
RELAY: LO

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet   

RELAY BOX

Headlamps Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-295

COMMENTS ON TROUBLE SYMPTOM

If any of the headlamps or the high-beam indicator 
does not illuminate, the wiring harness connector(s), 
the bulb or the fuse may be defective or burned out.

POSSIBLE CAUSES

• Malfunction of the headlamp bulbs

• Malfunction of the high-beam indicator bulb

• Damaged harness wires and connectors

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-296

DIAGNOSIS PROCEDURE

Step 1. Connector check: A-35 headlamp (HI: RH) 
connector or A-21 headlamp (HI: LH) connector, 
A-38 headlamp (LO: RH) connector or A-18 
headlamp (LO: LH) connector