Code No. B1489 Passenger’s air bag OFF indicator lamp (open circuit)
<Vehicles for RUSSIA>
caution |
If diagnosis code B1489 is set in the SRS-ECU, be sure
to diagnose the CAN bus line
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OPERATION
- Power for the passenger’s air bag OFF indicator lamp is supplied
from the Ignition switch (IG1) <Vehicles without KOS> or the IG1
relay <Vehicles with KOS>.
- The passenger’s air bag OFF indicator lamp illuminates when the
ignition switch is turned to the "ON" position and goes out after
approximately 6 to 8 seconds if there is not a malfunction in the SRS
system.
TROUBLE JUDGEMENT
This 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.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Malfunction of the SRS-ECU
- Malfunction of the passenger’s air bag OFF indicator lamp
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III to diagnose the CAN bus
lines.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair
the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
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STEP 2. Check whether the diagnosis code is set again.
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(1)Connect the negative battery terminal.
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(2)After erasing the diagnosis code memory, check the
diagnosis code again.
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(3)Disconnect the negative battery terminal.
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Q.
Is diagnosis code No. B1489 set?
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Go to Step 3.
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Intermittent malfunction (Refer to
GROUP 00 - How to Use Troubleshooting/Inspection Service Points
- How to Cope with Intermittent Malfunction).
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STEP 3. Check the passenger’s air bag OFF indicator
lamp.
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It is checked whether passenger’s air bag
OFF indicator lamp is normal (Refer to ).
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Q.
Is the check result normal?
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Go to Step 4.
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Replace hazard indicator assembly
(Refer to GROUP 52A, Instrument Centre Panel ).
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STEP 4. Resistance measurement at the SRS-ECU connector and the
passenger’s air bag OFF indicator lamp connector.
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(1)Check that the negative battery terminal is disconnected.
If the negative battery terminal is connected, disconnect it.
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(2)After disconnecting the SRS-ECU connector, connect it
again. <Vehicles without rear curtain air bag>
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![](../../../img/52/AC905015AC00ENG.png)
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(3)While pushing the part "A" indicated in the
figure of the harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the SRS-ECU
connector. <Vehicles with rear curtain air
bag> (4)Disconnect the passenger’s air bag OFF indicator
lamp connector. (5)Take the measurements below at the SRS-ECU and
passenger’s air bag OFF indicator lamp wiring harness side
connectors.
- Continuity OFLP line between SRS-ECU connector and passenger’s
air bag OFF indicator lamp connector
OK: Continuity (less than 2 Ω)
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harnesses OFLP line
between the SRS-ECU connector and the hazard indicator assembly
connector.
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STEP 5. Measure the voltage at the passenger’s air bag OFF
indicator lamp connector.
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(1)Disconnect the passenger’s air bag OFF indicator
lamp connector.
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(2)Connect the negative battery terminal.
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(4)Measure the voltage between the hazard indicator assembly
harness side connector and the body earth. OK: System
voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Repair
the wiring harness power supply line between the Ignition switch (IG1)
<Vehicles without KOS> or IG1 relay <Vehicles with
KOS> and the hazard indicator assembly.
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STEP 6. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No. B1489 set?
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Replace SRS-ECU).
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Intermittent malfunction (Refer to
GROUP 00 - How to Use Troubleshooting/Inspection Service Points
- How to Cope with Intermittent Malfunction).
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