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U1503-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM FCM (CONTINUED) For the Anti-Lock Brake System circuit diagram. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS) For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes FCM CAN BUS DTCS ANTI-LOCK BRAKE MODULE Diagnostic Test 1. CHECK IF FCM CAN BUS DTC’S ARE PRESENT With the scan tool, read FCM DTCs. Are there any FCM CAN BUS DTC’s present? Yes >> Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diag- nose the appropriate symptom. Perform ABS VERIFICATION TEST - VER 1. No >> Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no Perform ABS VERIFICATION TEST - VER 1. 5 - 406 BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS WK |