diagnosis code 43: SRS warning lamp circuit open-circuited (Lamp does not Illuminate.)




OPERATION

  • Power for the SRS warning lamp is supplied from the ignition switch (IG1) circuit.
  • The SRS warning 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.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be set if the SRS warning lamp driving circuit is short to earth. However, if the vehicle condition returns to normal, diagnosis code 43 will be automatically erased, and the SRS warning lamp will go out.

PROBABLE CAUSES

  • Damaged wiring harnesses of connectors
  • Malfunction of the SRS-ECU
  • Malfunction of the combination meter

DIAGNOSIS PROCEDURE

STEP 1. Check the SRS warning lamp.
(1)Disconnect the negative battery terminal.

(2)Disconnected the SRS-ECU connector C-147.
(3)Connect the negative battery terminal.
(4)Turn the ignition switch to the "ON" position.

Q. Does the warning lamp illuminate?

Go to Step 3.

Go to Step 2.

STEP 2. Check the harness for short circuit to earth between battery (fusible link No.26) and combination meter C-02 (terminal No.40) and between combination meter C-02 (terminal No.333) and SRS-ECU connector C-147 (terminal No.18).


note Prior to the wiring harness inspection, check junction connector C-31, and repair if necessary.

Q. Is the check result normal?

Replace the combination meter (Refer to GROUP 54A, Combination Meters Assembly ).

Repair the harness wires between SRS-ECU connector C-147 (terminal No.18) and the battery (fusible link No.26).

STEP 3. Check whether the diagnosis code is reset.

Q. Is diagnosis code 43 set?
Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points).