Mitsubishi Grandis. Manual — part 1029
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-168
DIAGNOSIS CODE SET CONDITIONS
• This diagnosis code is set under one of the
following cases while the SRS-ECU is monitoring
the passenger’s air bag off indicator lamp drive
circuit:
• When a short circuit occurs in the
passenger’s air bag off indicator lamp drive
circuit.
• When a malfunction is detected in the output
transistor inside the SRS-ECU.
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
DIAGNOSIS 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. Connector check SRS-ECU connector
C-119.
Q: Is SRS-ECU connector C-119 good condition?
YES :
Go to Step 3.
NO :
Engage the connector correctly. Then go to
Step 4 .
STEP 3. Check the harness for short circuit
between passenger’s air bag off indicator lamp
C-25 (terminal No.3) and SRS-ECU connector
C-119 (terminal No.21).
Q: Are the harness wires between SRS-ECU
connector C-119 (terminal No.21) and the
passenger’s air bag off indicator lamp C-25
(terminal No.3) in good condition?
YES :
Go to Step 4 .
NO :
Repair the harness wires. Then go to Step 4
.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1488 set?
AC311438 AD
C-119 (Y)
Connector: C-119
Harness side
(front view)
AC310613
BI
Connector: C-25 <LHD>
Harness side
AC310631BE
Connector: C-25 <RHD>
Harness side
AC311438 AD
C-119 (Y)
Connector: C-119
Harness side
(front view)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-169
YES :
Replace the SRS-ECU (Refer to
NO :
The procedure is complete (If no
malfunctions are found in all steps, an
intermittent malfunction is suspected). Refer
to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
.
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-170
Code No.B1489: Passenger’s air bag off indicator lamp drive circuit system fault 1 (Lamp does not
Illuminate).
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
SRS-ECU
IGNITION
SWITCH (IG1)
PASSENGER'S
AIR BAG OFF
INDICATOR LAMP
RELAY
BOX
TAIL LAMP
RELAY
FRONT-ECU
Air Bag Off Indicator Lamp Drive Circuit <LH drive vehicles>
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-171
CAUTION
If diagnosis code B1489 is set in the SRS-ECU,
always diagnose the CAN main bus line.
OPERATION
• Power for the passenger’s air bag off indicator
lamp is supplied from the ignition switch (IG1).
• The passenger’s air bag off indicator lamp
illuminates when the ignition switch is turned to
the "ON" position and goes out after
approximately 7 seconds if there is not a
malfunction in the SRS system.
• If a failure occurs in the system, the SRS-ECU
will stop sending that SRS warning lamp "OFF"
signal, thus causing the combination meter to
illuminate the SRS warning lamp.
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
SRS-ECU
IGNITION
SWITCH (IG1)
PASSENGER'S
AIR BAG OFF
INDICATOR LAMP
RELAY
BOX
TAIL LAMP
RELAY
FRONT-ECU
Air Bag Off Indicator Lamp Drive Circuit <RH drive vehicles>
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