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
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B




STEP 1. Check the SRS-ECU connector C-72 /C-72 and C-74 .

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 connector C-72 /C-72 and C-74 for damage. If SRS-ECU connectors C-72 and C-74 are damaged, repair or replace them.







1. Disconnect SRS-ECU connectors C-72 and C-74.
2. Check the connector lock switch terminal inside the harness side connector for improper contact or deformation.

Q: Are SRS-ECU connectors C-72 and C-74 in good condition?

YES: Eras the DTC memory, and recheck if any DTC sets. If DTC 34 sets, replace the SRS-ECU.Then go to Step 3.

NO: Repair or replace the SRS-ECU connector C-72, C-74. Refer to Harness Connector Inspection. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code.

Q: Is DTC 34 output?

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).