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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 SRS-ECU Q:Is the DTC set? YES: Troubleshoot the SRS (Refer to GROUP 52B, NO: Go to Step 3. STEP 3. Recheck for diagnostic trouble code. (1) Erase the DTC. (2) Turn the ignition switch from "LOCK" (OFF) position to "ON" (3) Check if DTC is set. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is the DTC set? YES: Replace the combination meter. NO: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection DTC U0154: Occupant classification-ECU CAN timeout M15410100105USA0000010000 ⦆ If DTC U0154 is set, be sure to diagnose the CAN ⦆ When replacing the ECU, always check that the COMBINATION METER 54Ab-29 DIAGNOSIS |