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Mitsubishi Grandis. Manual - part 1030
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-172
• 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 the passenger’s air
bag off indicator lamp driving circuit is short to earth.
If the vehicle condition returns to normal, diagnosis
code B1489 will be automatically erased, and the
warning 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 lamp
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 MB991958, always
turn the ignition switch to the "LOCK" (OFF)
position before connecting or disconnecting
MUT-III MB991958.
(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. Check the passenger’s air bag off
indicator lamp connector C-25.
Q: Is the connector correctly engaged?
YES :
Go to Step 5 .
NO :
Engage the connector correctly. Then go to
Step 10 .
AC310613
BI
Connector: C-25 <LHD>
Harness side
AC310631BE
Connector: C-25 <RHD>
Harness side