Mitsubishi Grandis. Manual — part 202
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-270
Step 8. Check the wiring harness from C-221
ETACS-ECU connector terminal Nos.69 and 71 to
C-308 key cylinder illumination lamp connector
terminal Nos.1 and 2.
• Check the input and output lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the wiring harness.
Step 9. Retest the system.
Check that the ignition key cylinder illumination lamp
illuminates/extinguishes normally.
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.
AC310626
Connector: C-221
Junction block (Rear view)
<LHD>
AC
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
Harness side
C-221(GR)
AC310620
Connector: C-221
Junction block
(Rear view)
<RHD>
AC
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
Harness side
C-221(GR)
AC310153AD
Connector: C-308 <LHD>
Harness side
AC310183
AD
Connector: C-308 <RHD>
Harness side
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-271
SEAT BELT WARNING LAMP
Inspection Procedure L-1: The seat belt warning lamp does not flash normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU flashes the seat belt warning lamp
in accordance with the input signal from the ignition
switch (IG1).
If it does not flash normally, these input signal
circuit(s) or the ETACS-ECU may be defective.
POSSIBLE CAUSES
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
Step 1. SWS monitor data list.
Check the SWS communication signal, which are
related to the seat belt warning lamp.
<Selected item> ETACS ECU
• Ignition switch: ON
OK: Normal condition is displayed.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure Q-2 "The
ignition switch (IG1) signal is not received
."
Step 2. ETACS switch data by using the SWS
monitor
Check the ETACS-ECU input signal related to the
seat belt warning lamp function.
• Ignition switch: ON
• Driver's seat belt switch: ON (Unfastened)
• Passenger’s seat belt switch: ON (Unfastened)
• Seat occupancy sensor: ON (Seat occupied)
OK: Normal conditions are displayed for all
the items
Q: Are the check result normal?
Seat Belt Warning Lamp Function
ETACS-
ECU
· SPEED SIGNAL
· DRIVER'S SEAT BELT SWITCH
COMBINATION
METER
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
INPUT SIGNAL
INPUT SIGNAL
· IGNITION SWITCH (IG1)
· PASSENGER'S SEAT BELT SWITCH
Item No.
Item name
Normal condition
Item 30
IG SW(IG1)
ON
Item No.
Item name
Normal condition
Item 12
SEAT BELT SW
ON
Item 43
As.SeatBeltSW
ON
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-272
Normal conditions are displayed for all the items :
Go to Step 3.
Normal condition is not displayed for item No.12. :
Refer to inspection procedure Q-19 "The
driver's seat belt switch signal is not
received
<LH drive vehicles> or
<RH drive vehicles>."
Normal condition is not displayed for item No.43. :
Refer to inspection procedure Q-20 "The
front passenger's seat belt switch signal is
not received
or
<RH drive vehicles>."
Step 3. ETACS ANALOG data by using the SWS
monitor.
Check the ETACS-ECU input signal related to the
seat belt warning lamp function.
• Set the simulated vehicle speed at approximately
10km/h.
OK: Normal condition is displayed.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Refer to inspection procedure Q-25 "The
vehicle speed signal is not received
."
Step 4. Retest the system.
Check that the seat belt warning lamp flashes
normally.
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.
Item No.
Item name
Normal condition
Item 03
SPEED SENSOR
8
− 10 km/h
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-273
HEADLAMP AND TAIL LAMP
Inspection Procedure M-1: The tail/stop lamps do not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If all the tail/stop lamps do not illuminate, the tail
lamp switch input circuit or the front-ECU may be
defective.
POSSIBLE CAUSES
• Malfunction of the column switch
• Malfunction of the front-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the
column switch (column-ECU) and the front-ECU and
the SWS communication lines are normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• COLUMN ECU
• FRONT ECU
OK: "OK" are displayed for all the items
Q: Are the check result normal?
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
BATTERY
FRONT-ECU
TAIL LAMP
RELAY
RELAY
BOX
INPUT SIGNAL
· HEADLAMP AUTOMATIC
SHUTDOWN
· TAIL LAMP SWITCH
· LICENCE PLATE LAMP
· POSITION LAMP (LH)
· TAIL/STOP LAMP (LH)
· POSITION LAMP (RH)
· TAIL/STOP LAMP (RH)
Tail Lamp Relay Circuit
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