Mitsubishi Grandis. Manual — part 271
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-546
Inspection Procedure Q-20: The front passenger's seat belt switch signal is not received. <RH drive
vehicles>
CAUTION
Whenever the ECU is replaced, ensure that the
input signal circuit is normal.
COMMENTS ON TROUBLE SYMPTOM
Input signal from the passenger’s seat belt switch is
used to operate the central door locking function. If
the signal is abnormal, the central door locking
function will not work normally.
POSSIBLE CAUSES
• Malfunction of the passenger’s seat belt switch
• Malfunction of the seat occupancy sensor
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
Step 1. Connector check: D-23 seat belt switch
(LH) connector
Q: Is the check result normal?
ETACS-
ECU
SEAT
BELT
SWITCH
(LH)
SEAT
OCCUPANCY
SENSOR
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
Passenger's Seat Belt Switch Input Circuit <RHD>
AC312058
AD
Connector: D-23 <RHD>
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-547
YES :
Go to Step 2.
NO :
Repair the defective connector.
Step 2. Check the seat belt switch (LH).
Refer to GROUP 52A
− Front seat belt
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the inner seat belt (front
passenger's side).
Step 3. Connector check: D-23-1 seat occupancy
sensor connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
Step 4. Check the seat occupancy sensor.
Refer to GROUP 52A
− Front seat
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the seat occupancy sensor.
Step 5. Resistance measurement at the D-23-1
seat occupancy sensor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between D-23-1 seat occupancy
sensor connector terminal No.3 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
Step 6. Check the wiring harness between D-23-1
seat occupancy sensor connector terminal No.3
and body earth.
• Check the earth wires for open circuit.
Q: Is the check result normal?
YES :
Replace the inner seat belt (front
passenger's side).
NO :
Repair the wiring harness.
Step 7. Connector check: C-220 ETACS-ECU
connector
Q: Is the check result normal?
AC313233
Connector: D-23-1
AC
Harness side
<RHD>
AC313233
Connector: D-23-1
AC
Harness side
<RHD>
AC301541IC
Connector D-23-1
(Harness side)
AC313233
Connector: D-23-1
AC
Harness side
<RHD>
AC312047
Connector: C-220
Junction block (Rear view)
AC
<RHD>
Harness side
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-548
YES :
Go to Step 8.
NO :
Repair the defective connector.
Step 8. Check the wiring harness from D-23-1
seat occupancy sensor connector terminal No.1
to C-220 ETACS-ECU connector terminal No.29.
NOTE:
Prior to the wiring harness inspection, check
intermediate connector C-16, and repair if necessary.
• Check the input line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the wiring harness or replace the
inner seat belt (front passenger's side).
Step 9. ETACS switch data by using the SWS
monitor
Check the input signal from the front passenger's
seat belt switch.
• Ignition switch: ON
• Passenger’s seat belt switch: ON (Unfastened)
• Seat occupancy sensor: ON (Seat occupied)
Check that the MUT-III displays normal condition
when the condition above is changed to the condition
below.
• Passenger’s seat belt switch: OFF (seat belt
fastened) or seat occupancy sensor: OFF (seat
not occupied)
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
NO :
Replace the ETACS-ECU.
AC312047
Connector: C-220
Junction block (Rear view)
AC
<RHD>
Harness side
AC313233
Connector: D-23-1
AC
Harness side
<RHD>
AC312043
Connector: C-16 <RHD>
AH
9
21
33
35
24
12
3 4
7
8
5 6
39
28
41
30
18
4243
31
1920
32
40
29
1617
38
27
15
37
36
26
14
13
25
2
1
34
23
11
10
22
Item No.
Item name
Normal
condition
Item 43
As.SeatBeltSW
ON
Item No.
Item name
Normal
condition
Item 43
As.SeatBeltSW
OFF
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-549
Inspection Procedure Q-21: Signal is not received from the remote controlled mirror switch
(folding/unfolding switch).
CAUTION
Whenever the ECU is replaced, ensure that the
input signal circuit is normal.
COMMENTS ON TROUBLE SYMPTOM
The electric-folding door mirrors work in accordance
with the input signal from the remote controlled
mirror switch. If the input signal is abnormal, the door
mirrors will not work normally.
POSSIBLE CAUSES
• Malfunction of the remote controlled mirror switch
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
ETACS-
ECU
REMOTE
CONTROLLED
MIRROR SWITCH
<RHD>
<LHD>
Remote Controlled Mirror Switch Input Circuit
FOLD
SWITCH
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
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