B1519

DTC B1519: Connector Lock System Detects Connector Unlocked

CAUTION:
If DTC B1519 is set in the SRS-ECU, always diagnose the CAN main bus line.

DTC SET CONDITIONS

This DTC is set if a poor connection at the SRS-ECU is detected.

TROUBLESHOOTING HINTS

- Damaged connectors
- Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.





(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect the scan tool Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

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

YES Go to Step 2.

NO Repair the CAN bus line CAN Bus Diagnostics Chart).

STEP 2. Recheck for diagnostic trouble code.





Check again if the DTC is set.
(1)Erase the DTC.
(2)Turn the ignition switch to "ON" position.
(3)Check if the DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Go to Step 3.

NO There is an intermittent malfunction such as poor engaged connector(s) or open circuit How to Cope With Intermittent Malfunctions).

STEP 3. Check the SRS-ECU connector C-122, C-123 and C-124.





Q. Are connectors correctly engaged?

YES Go to Step 4.

NO Engage the connectors correctly. Then go to Step 5.

STEP 4. Check SRS-ECU connector C-122, C-123 and C-124 for damage.

(1)Disconnect SRS-ECU connectors C-122, C-123 and C-124.









(2)Check the connector lock switch terminal inside the harness side connector for improper contact or deformation.

Q. Are the SRS-ECU connector C-122, C-123 and C-124 in good condition?

YES Erase the diagnostic trouble code memory, and check the diagnostic trouble code.
If DTC B1519 sets, replace the SRS-ECU (Refer to Service and Repair). Then go to Step 5.

NO Replace the SRS-ECU connector C-122, C-123 and C-124. Harness Connector Inspection. Then go to Step 5.

STEP 5. Recheck for diagnostic trouble code.





Check again if the DTC is set.
(1)Erase the DTC.
(2)Turn the ignition switch to the "ON" position.
(3)Check if the DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC B1519 set?

YES Return to Step 1.

NO The procedure is complete.