DTC C1900: No Registration: Diagnosis

Required Special Tools: 

• 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

1. STEP 1. M.U.T.-III CAN bus diagnostics 

   Use scan tool to diagnose the CAN bus lines.

   Q: Is the check result normal? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
2. STEP 2. Diagnostic trouble code check 
   1. Turn the ignition switch to the "LOCK" (OFF) position.
   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 the DTC C1900 set? 

      1. YES:  Register the ID codes (Refer to ID CODES REGISTRATION PROCEDURE  ). Then go to Step 3.
      2. NO:  The procedure is complete.
3. STEP 3. Recheck for diagnostic trouble code. 

   Check again if the DTC is set.

   1. Turn the ignition switch to the "LOCK" (OFF) position.
   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 the DTC C1900 reset? 

      1. YES:  Replace the WCM and register the ID codes (Refer to ID CODES REGISTRATION PROCEDURE  ). Then start over at Step  1.
      2. NO:  The procedure is complete.