Code No. B1647 Passenger’s air bag ON indicator lamp (short
circuited) <Vehicles for RUSSIA>
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If diagnosis code B1647 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 ON indicator lamp is supplied
from the Ignition switch (IG1) <Vehicles without KOS> or the IG1
relay <Vehicles with KOS>.
- The passenger’s air bag ON 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 the passenger’s
air bag ON indicator lamp driving circuit is short to earth.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Malfunction of the SRS-ECU
- Malfunction of the passenger’s air bag ON 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. B1647 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 ON indicator
lamp.
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It is checked whether passenger’s air bag
ON 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.
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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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(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 hazard indicator assembly
connector.
(5)Take the measurements below at the SRS-ECU connector.
- Continuity between OFLP line and body earth
OK: No continuity
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. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No. B1647 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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