B1471 – Seat belt pre-tensioner (LH) (squib) system (open-circuited in the squib circuit) MMC Colt



OPERATION


DIAGNOSIS CODE SET CONDITIONS


PROBABLE CAUSES

  • Improper connector contact
  • Open circuit in the seat belt pre-tensioner (LH) (squib) circuit
  • Malfunction of the SRS-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III diagnosis code.

    Q. Is the CAN bus line found to be normal?

    STEP 2. Check whether the diagnosis code is reset.

    Q. Is the diagnosis code set?

    STEP 3. Check the seat belt pre-tensioner (LH) (M.U.T.-III diagnosis code).

    Q. Is diagnosis code B1471 set?

    STEP 4. Resistance measurement between SRS-ECU connector B-109 (terminal No.19 and 20) and the seat belt pre-tensioner C-18 (terminal No.2 and 1).

  • SRS-ECU connector B-109 (terminal No.19) and the special tool (terminal No.1)
  • SRS-ECU connector B-109 (terminal No.20) and the special tool (terminal No.2)
  • Q. Are the check results normal?

    STEP 5. Check whether the diagnosis code is reset.

    Q. Is diagnosis code B1471 set?

    Author: admin