Code No. B1488 Passenger’s air bag OFF indicator lamp (short circuited)
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If diagnosis code B1488 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 the passenger’s air bag OFF 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 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. B1488 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.
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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)Disconnect the SRS-ECU connector.
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(3)Disconnect the hazard indicator assembly connector.
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(4)Take the measurements below at the SRS-ECU connector.
- Continuity between 0FLP line and body earth
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the wiring harnesses 0FLP line between the SRS-ECU connector and the hazard indicator assembly connector.
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STEP 5. Resistance measurement at the hazard indicator assembly 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)Disconnect the SRS-ECU connector.
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(3)Take the following measurements at the backside of the hazard indicator assembly side connector (harness side).
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(4)
- Continuity between LP line and body earth
OK: No continuity
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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 harnesses LP line between the hazard indicator assembly connector and the body earth.
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STEP 6. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No. B1488 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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