Mitsubishi Grandis. Manual - part 272

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-550

DIAGNOSIS PROCEDURE

Step 1. Connector check: C-129 remote 
controlled mirror switch connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the connector.

Step 2. Check the remote controlled mirror 
switch.

Refer to GROUP 51 

− Door mirror 

P.51-51

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the remote controlled mirror switch.

Step 3. Resistance measurement at the C-129 
remote controlled mirror switch connector.

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Continuity between C-129 remote controlled 

mirror switch connector terminal No.1 and body 
earth

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

AC312031

AB

Connector: C-129

Harness side

<LHD>

AC312043AB

Connector: C-129 <RHD>

Harness side

AC312031

AB

Connector: C-129

Harness side

<LHD>

AC312043AB

Connector: C-129 <RHD>

Harness side

AC312730AC

Connector C-129
(Harness side)

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-551

Step 4. Check the wiring harness between C-129 
remote controlled mirror switch connector 
terminal No.1 and body earth.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-01 <RH drive vehicles>, and repair if 
necessary.

• Check the earth wires 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 5. Connector check: C-220 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the connector.

AC312031

AB

Connector: C-129

Harness side

<LHD>

AC312043AB

Connector: C-129 <RHD>

Harness side

AC312043AC

Connector: C-01<RHD>

AC312037

Connector: C-220

Junction block (Rear view)

AC

<LHD>

Harness side

AC312047

Connector: C-220

Junction block (Rear view)

AC

<RHD>

Harness side

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-552

Step 6. Check the wiring harness between C-129 
remote controlled mirror switch connector 
terminal No.4 and C-220 ETACS-ECU connector 
terminal No.24.

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

Step 7. ETACS switch data by using the SWS 
monitor

Check the input signal from the remote controlled 
mirror switch.

• Ignition switch: ON

• Remote controlled mirror (folding/unfolding) 

switch: from OFF to ON

OK: Normal condition is displayed.

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.

AC312031

AB

Connector: C-129

Harness side

<LHD>

AC312043AB

Connector: C-129 <RHD>

Harness side

AC312037

Connector: C-220

Junction block (Rear view)

AC

<LHD>

Harness side

AC312047

Connector: C-220

Junction block (Rear view)

AC

<RHD>

Harness side

Item No. Item name

Normal conditions

Item 14

EL RET MIR SW OFF to ON (only 

when switch is 
operated)

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-553

Inspection Procedure Q-22: The interior lamp "all on" or "all off" switch signal is not sent to the 
ETACS-ECU.

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signals from the interior lamp switches are 
used to operate the interior lamps. If the signals are 
abnormal, the  interior lamps will not illuminate and 
extinguish normally.

POSSIBLE CAUSES

• Malfunction of the interior lamp

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

ETACS-ECU

ROOM LAMP

NOTE

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

RHD
LHD

Interior Lamp Input Circuit

INTERIOR
LAMP
SWITCH