Inspection Procedure 4: No DTC is set even when the AWD/LOCK Indicator Lights Flash: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle Communication Interface
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. Check if AWD/LOCK Indicator Lights flash simultaneously 
   1. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
   2. Check that the AWD/LOCK indicator lights flash simultaneously when the drive mode selector is switched to 4WD (AWD) position, or LOCK position.

   Q: Does the AWD/LOCK Indicator Lights flash simultaneously? 

   1. YES: 
      • When the drive system fluid temperature warning display illuminates in the combination meter, cool down the electronic control coupling.
      • When the drive system fluid temperature warning display does not illuminate in the combination meter, referring to "Inspection Procedure 1: Scan tool MB991958 cannot Communicate with the Electronic Control AWD System < ECU power supply circuit system check >", perform the check INSPECTION PROCEDURE 1: SCAN TOOL MB991958 CANNOT COMMUNICATE WITH THE ELECTRONIC CONTROL AWD SYSTEM.  .
   2. NO:  Referring to the Inspection Chart for Trouble Symptoms, perform the check TROUBLE SYMPTOM CHART  .