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ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS TSB Revision ANTI-LOCK BRAKING SYSTEM (ABS) 35B-99 DIAGNOSIS Required Special Tool: • MB991223: Harness Set STEP 1. Check the ABS warning light circuit at M-ASTC- (2) Remove the valve relay. warning light goes out. Q: Does the ABS warning light go out? YES : Replace the M-ASTC-ECU and then go to Step 4. AC203901 AC204627AG CONNECTOR: E-120 E-120 HARNESS CONNECTOR: E-120 AC204674 AB B-21X (VALVE RELAY) CONNECTOR: B-21X |