DTC 34: Connector Lock System Detects Connector Unlocked.: 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 < Vehicles without SRS side air bag >/C-72 and C-74 < Vehicles with SRS side air bag >.

Fig 1: Identifying C-72 And C-74 Connector Location
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Are connectors correctly engaged?
1. YES: Go to Step 2.
2. NO: Engage the connectors correctly. Then go to Step 3.
STEP 2. Check SRS-ECU connector C-72 < Vehicles without SRS side air bag >/C-72 and C-74 < Vehicles with SRS side air bag > 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.
  
  Fig 2: Identifying C-72 And C-74 Connector Location
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Check the connector lock switch terminal inside the harness side connector for improper contact or deformation.
  
  Fig 3: Checking Connector Lock Switch Terminal Inside Harness Side Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Are SRS-ECU connectors C-72 and C-74 in good condition?
1. YES: Eras the DTC memory, and recheck if any DTC sets. If DTC 34 sets, replace the SRS-ECU. Refer to HARNESS CONNECTOR . Then go to Step 3.
2. 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?
1. YES: There is no action to be taken.
2. NO: The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).