Mitsubishi Grandis. Manual — part 126
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-501
Inspection Procedure Q-19: The driver'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 driver's seat belt switch signal is
used to operate the seat belt warning buzzer function
and seat belt warning lamp. If the signal is abnormal,
the seat belt warning buzzer function and seat belt
warning lamp will not work normally.
POSSIBLE CAUSES
• Malfunction of the driver's seat belt switch
• Malfunction of the ETACS-ECU
• Malfunction of the combination meter
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
Step 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54D
− Diagnosis
Step 2. MUT-III diagnosis code
Check whether the combination meter-related
diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Diagnose the combination meter (Refer to
GROUP 54A
− Combination meter
NO :
Go to Step 3.
COMBINATION METER
SEAT BELT
SWITCH (RH)
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
Driver's Seat Belt Switch Input Circuit <RHD>
ETACS-ECU
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-502
Step 3. Connector check: D-26 seat belt switch
(RH) connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
Step 4. Check the seat belt switch (RH).
Refer to GROUP 52A
− Front seat belt
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the inner seat belt (driver's side).
Step 5. Resistance measurement at the D-26 seat
belt switch (RH) connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between D-26 seat belt switch (RH)
connector terminal No.2 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-26
seat belt switch (RH) connector terminal No.2
and body earth.
• Check the earth wires for open circuit.
Q: Is the check result normal?
YES :
Replace the inner seat belt (driver's side).
NO :
Repair the wiring harness.
Step 7. Connector check: C-02 combination
meter connector
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the defective connector.
AC312058
Harness side
AC
Connector: D-26 <RHD>
AC312058
Harness side
AC
Connector: D-26 <RHD>
AC312730AP
Connector D-26
(Harness side)
AC312058
Harness side
AC
Connector: D-26 <RHD>
AC312043
Connector: C-02 <RHD>
AK
Harness side
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 3938 37
23
24
25
26
27
28
29
30
31
32
33
34
35
36
22 21
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-503
Step 8. Check the wiring harness from D-26 seat
belt switch (RH) terminal No.1 to C-02
combination meter connector terminal No.32.
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.
Step 9. Retest the system.
After the ETACS-ECU is replaced, check that the
driver's seat belt switch signal is received.
(1) Replace the ETACS-ECU.
(2) Check that the driver's seat belt switch signal is
received.
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 combination meter.
AC312043
Connector: C-02 <RHD>
AK
Harness side
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 3938 37
23
24
25
26
27
28
29
30
31
32
33
34
35
36
22 21
AC312058
Harness side
AC
Connector: D-26 <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
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-504
Inspection Procedure Q-20: The front passenger's seat belt switch signal is not received.<LH 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 seat belt warning buzzer function
and seat belt warning lamp. If the signal is abnormal,
the seat belt warning buzzer function and seat belt
warning lamp 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-26 seat belt switch
(LH) connector
Q: Is the check result normal?
ETACS-
ECU
SEAT
BELT
SWITCH
(RH)
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 <LHD>
AC312051
Connector: D-26 <LHD>
Harness side
AD
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