CODE NO. B1489
Passenger’s air bag OFF indicator lamp (open circuit)
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If the 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 fusible link (33).
- 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 reset.
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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 the 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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(1)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 centre panel assembly (Refer to GROUP 52A -
Instrument Panel
Assembly ).
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STEP 4. Resistance measurement at the C-126 SRS-ECU connector terminal
No.13 and the C-205 centre panel assembly connector terminal No.14.
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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)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 C-126 SRS-ECU
connector.
(3)Disconnect the C-205 centre panel assembly connector.
(4)Take the measurements below at the C-126 and C-205 wiring harness side connectors.
- Continuity between C-126 SRS-ECU connector terminal No.
13 and C-205 centre panel assembly connector terminal No. 14
OK: Continuity (less than 2 Ω)
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harnesses between the C-126 SRS-ECU connector terminal No. 13
and the C-205 centre panel assembly connector terminal No. 14.
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STEP 5. Measure the voltage at the centre panel assembly connector.
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(1)Disconnect the C-205 centre panel assembly connector.
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(2)Connect the negative battery terminal.
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(4)Measure the voltage between the C-205 harness side connector terminal No. 12 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 between the C-417 ETACS-ECU connector terminal No. 5
and the C-205 centre panel assembly connector terminal No. 12.
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STEP 6. Check whether the diagnosis code is reset.
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Q.
Is the diagnosis code No. B1489 set?
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Replace SRS-ECU (Refer to ).
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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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)