Inspection Procedure 3: SRS warning lamp does not illuminate.


OPERATION



  • The SRS warning 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.
  • SRS-ECU sends the SRS warning lamp signal to the combination meter via the CAN communication.
  • As a cause, the failure of CAN bus line, combination meter, or SRS-ECU is suspected.

PROBABLE CAUSES



  • Damaged wiring harness and connectors
  • Combination meter malfunction
  • Malfunction of SRS-ECU

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 lines (refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III actuator test
Use M.U.T.-III to perform the SRS-ECU actuator tests.
Item No. 01: SRS warning lamp

Q. Does the SRS warning lamp turn on and off normally?
Go to Step 5.
Go to Step 3.

STEP 3. M.U.T.-III actuator test
Use M.U.T.-III to perform the combination meter actuator tests.
Item No. 07: Indicator1

Q. Does the SRS warning lamp turn on and off normally?
Replace SRS-ECU (Refer to ).
Go to Step 4.

STEP 4. Wiring harness inspection between C-417 ETACS-ECU connector terminal No. 5 and C-203 combination meter connector terminal No. 2


note Prior to the wiring harness inspection, check the ETACS-ECU connector C-417 and combination meter connector C-203, and repair if necessary.

  • The SRS warning lamp inspection for open and short circuit

Q. Is the check result normal?
Replace the combination meter (Refer to GROUP 54A - Combination Meter ).
Repair the wiring harness.

STEP 5. Recheck of the SRS warning lamp
(1)Connect the negative battery terminal.
(2)Ignition switch: ON

Q. Does the lamp illuminate?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Return to Step 1.