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TROUBLESHOOTING HINTS ⦆ The key reminder switch may be defective ⦆ The driver's door switch may be defective ⦆ The ignition key cylinder illumination light bulb may ⦆ The ETACS-ECU may be defective ⦆ The wiring harness or connectors may have loose, 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 STEP 1. Using scan tool MB991958, read the diagnostic 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 scan (2) Turn the ignition switch to the "ON" position. (3) Check whether the ETACS-ECU related DTC is set. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the DTC set? YES: Diagnose the ETACS-ECU. Refer to GROUP 54Ad, NO: Go to Step 2. STEP 2. Using scan tool MB991958, check data list. ⦆ Turn the ignition switch to the "LOCK" (OFF) position. ⦆ Remove the ignition key from the ignition key cylinder. ⦆ Open the driver's door. Item No. Item name Normal Item 228 Dr door unlock ON Item 254 Dr door ajar switch 0 V Item 256 Dr door ajar switch ON IGNITION SWITCH 54Ag-7 SYMPTOM PROCEDURES |