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STEP 1. Using scan tool MB991958, diagnose the CAN bus ZC501967 AC404789 ZC5019680000 MB991824 MB991827 MB991910 Data link connector To prevent damage to scan tool MB991958, always turn the (1) Connect scan tool MB991958. Refer to "How to connect the (2) Turn the ignition switch to the "ON" position. (3) Diagnose the CAN bus line. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to GROUP 54D, STEP 2. Using scan tool MB991958 read the ETACS-ECU (1) Turn the ignition switch to the "ON" position. (2) Check for the DTC related to the ETACS-ECU. (3) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the check result satisfactory? YES: Go to Step 3. NO: Diagnose the ETACS-ECU (Refer to GROUP 54Ab, Diagnostic Trouble Code P.54Ad-8). STEP 3. Using scan tool MB991958, check for any ⦆ WCM <vehicles with WCM> ⦆ KOS <vehicles with KOS> (1) Turn the ignition switch to the "ON" position. (2) Check for a DTC related to the relevant system. (3) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the check result satisfactory? YES: Go to Step 5. NO: Go to Step 4. STEP 4. Recheck for diagnostic trouble code. (1) Turn the ignition switch to the "ON" position. AIR CONDITIONING 55A-39 MANUAL A/C DIAGNOSIS |