DTC B16A1: Taillight (LH) circuit open ; DTC B16A8: Taillight (LH) circuit short: Diagnosis

Required Special Tools:

• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

1. STEP 1. Check rear combination light (LH) connector D-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is combination light (RH) connector D-14 in good condition? 

   YES:  Go to Step 2.

   NO:  Repair the damaged parts.

2. STEP 2. Resistance measurement at rear combination light (LH) connector D-14. 
   1. Disconnect the connector, and measure at the wiring harness side.
   2. Measure the resistance between the rear combination light (LH) connector D-14 (terminal No. 4) and the body ground.

      The measured value should be continuity exists (2 Ωor less). 

   Q: Does the measured resistance value correspond with this range? 

   YES:  Go to  STEP 4.

   NO:  Go to Step 3.

   Fig 1: Measuring Resistance Between Rear Combination Light (LH) Connector D-14 (Terminal No. 4) And Body Ground

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the wiring harness between rear combination light (LH) connector D-14 (terminal No. 4) and ground. 

   Q: Is the check result normal? 

   YES:  Go to  STEP 6.

   NO:  Repair the wiring harness.

4. STEP 4. Check ETACS-ECU connectors C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connectors C-311 in good condition? 

   YES:  Go to Step 5.

   NO:  Repair the damaged parts.

5. STEP 5. Check the wiring harness between rear combination light (LH) D-14 connector (terminal No. 2) and ETACS-ECU connector C-311 (terminal No. 10). 

   Q: Is the wiring harness between rear combination light (LH) D-14 connector (terminal No. 2) and ETACS-ECU connector C-311 (terminal No. 10) in good condition? 

   YES:  Go to Step 6.

   NO:  Repair the wiring harness.

6. STEP 6. Using scan tool MB991958, Check whether the diagnostic trouble code is reset. 
   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.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL  ."
   2. Turn the ignition switch to the "ON" position.
   3. Erase the DTC.
   4. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
   5. Check if DTC is set.

   Q: Is the DTC set? 

   YES:  Replace the ETACS-ECU.

   NO:  The procedure is complete.

   Fig 2: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.