Code No. B1207 Passenger’s air bag OFF indicator lamp (short circuit)












caution If the diagnosis code B1207 is set in the SRS-ECU, be sure to diagnose the CAN bus line

OPERATION



  • Power for the passenger’s air bag OFF indicator lamp is supplied from the fusible link (34) or (44).
  • 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



PROBABLE CAUSES



  • Damaged wiring harnesses or connectors
  • Malfunction of the SRS-ECU
  • Malfunction of the instrument centre panel (passenger’s air bag OFF indicator lamp)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use 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 54C - Troubleshooting ).

STEP 2. Check whether the diagnosis code is reset.
(1)Connect the negative battery terminal.
(2)After erasing the diagnosis code memory, check the diagnosis code again.
(3)Disconnect the negative battery terminal.

Q. Is the diagnosis code No. B1207 set?
Go to Step 3.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

STEP 3. Check the instrument centre panel.
(1)It is checked whether instrument centre panel is normal (Refer to ).

Q. Is the check result normal?
Go to Step 4.
Replace instrument centre panel (Refer to GROUP 52A - Instrument Centre Panel ).

STEP 4. Resistance measurement at the C-10 instrument centre panel connector.
(1)Disconnect the C-122 SRS-ECU connector.
(2)
caution Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
Take the following measurements at the backside of the C-10 instrument centre panel side connector (harness side).

  • Continuity between terminal No.11 and body earth
OK: No continuity

Q. Is the check result normal?
Go to Step 5
Replace instrument centre panel (Refer to GROUP 52A - Instrument Centre Panel ).

STEP 5. Resistance measurement at the C-122 SRS-ECU connector.
(1)Disconnect the negative battery terminal.

(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-122 SRS-ECU connector.
(3)Take the measurements below at the SRS-ECU connector.

  • Continuity between terminal No.18 and body earth
OK: No continuity

Q. Is the check result normal?

Go to Step 6.

Repair the wiring harnesses between the C-122 SRS-ECU connector terminal No. 18 and the C-10 instrument centre panel connector terminal No. 11. Then go to Step 6.

STEP 6. Check whether the diagnosis code is reset.

Q. Is the diagnosis code No. B1207 set?
Replace SRS-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).