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Mitsubishi Grandis. Manual - part 1032
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-180
• The SRS warning lamp "OFF" signal is not sent
to the combination meter in the cases below,
either. Therefore, the combination meter will
illuminate the SRS warning lamp.
• The SRS-ECU connector is disconnected.
• The SRS-ECU is not working normally due to
a failure in its power supply lines.
• The wiring harness between the passenger’s
air bag off indicator lamp and the SRS-ECU is
broken.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be set if an open circuit has
occurred in the wiring harness between the
passenger’s air bag off indicator lamp and the
SRS-ECU. If the vehicle condition returns to normal,
diagnosis code B1489 will be automatically erased,
and the passenger’s air bag off indicator lamp will go
out.
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
• Malfunction of the passenger’s air bag OFF
indicator light
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. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is
not reset.
Q: Is the diagnosis code set?
YES :
Go to Step 3 .
NO :
There is an intermittent malfunction such as
poor engaged connector(s) or open circuit
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
STEP 3. MUT-III diagnosis code
CAUTION
To prevent damage to MUT-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting MUT-III.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the diagnosis code is set.
(3) Turn the ignition switch to the "LOOK (OFF)"
position.
Q: Is diagnosis code B1570, B1571, B1572, B1573,
B1574, B1575, B1576, B1577, B1578, B1579 or
B1581 set?
YES :
Carry out the troubleshooting of the
passenger’s air bag cut off switch system.
(Refer to
).
NO :
Go to Step 4 .
STEP 4 MUT-III actuator test.
• Item No.03: Passenger’s air bag off indicator
lamp illumination
Q: Does the passenger’s air bag off indicator lamp
illuminate or go out normally?
YES :
Go to Step 5 .
NO :
Replace the passenger’s air bag off
indicator lamp (Refer to GROUP 52A,
Instrument Panel Assembly
). Then
go to Step 6 .