Code No.B1488: Air Bag Off Indicator Lamp Circuit Malfunction


caution If diagnosis code B1488 is set in the SRS-ECU, always diagnose the CAN main bus line.

OPERATION

  • Power for the passenger’s air bag off indicator lamp is supplied from the ignition switch (IG1).
  • The passenger’s air bag off indicator lamp illuminates when the ignition switch is turned to the "ON" position and goes out after approximately 7 seconds if there is not a malfunction in the SRS system.
  • When the passenger’s air bag cut off switch is turned "OFF", the lamp will stay on to show that the passenger’s (front) air bag is not operational.

DIAGNOSIS CODE SET CONDITIONS
This code will be set if the transistor failure in the SRS-ECU is detected.

PROBABLE CAUSES

  • Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
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?
Replace the SRS-ECU (Refer to ).
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).