DTC 34

DTC 34: Connector Lock System Detects Connector Unlocked

DTC SET CONDITIONS
This DTC is set if a poor connection at the SRS-ECU is detected. However, if the vehicle condition returns to normal, DTC number 34 will be automatically erased, and the SRS warning light will go out.

TROUBLESHOOTING HINTS
- Damaged connectors
- Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B (Vehicles without CAN communication system)




STEP 1. Check the SRS-ECU connectors C-12, C-13.

Q: Are connectors correctly engaged?

YES: Go to Step 2.

NO: Engage the connectors correctly. Then go to Step 3.

STEP 2. Check SRS-ECU connectors C-12, C-13 for damage.

1. Disconnect SRS-ECU connectors C-12 and C-13.







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

Q: Are the SRS-ECU connectors C-12, C-13 in good condition?

YES: Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC 34 sets, replace the SRS-ECU. Then go to Step 3.

NO: Repair or replace the SRS-ECU connectors C-12, C-13. (Refer to Harness Connector Inspection) Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code.

Q: Is DTC 34 set?

YES: There is no action to be taken.

NO: The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction)