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BAS SOLENOID VALVE CIRCUIT (CONTINUED) When Monitored and Set Condition • When Monitored: With the ignition on. • Set Condition: The Controller Antilock Brake (CAB) detects a Brake Assist System (BAS) Solenoid Valve mal- POSSIBLE CAUSES BAS SOLENOID VALVE 5-VOLT SUPPLY CIRCUIT SHORT TO VOLTAGE BAS SOLENOID VALVE CONTROL CIRCUIT SHORT TO VOLTAGE BAS SOLENOID VALVE CIRCUITS SHORT TO EACH OTHER BAS SOLENOID VALVE 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND BAS SOLENOID VALVE CONTROL CIRCUIT SHORT TO GROUND BAS SOLENOID VALVE 5-VOLT SUPPLY CIRCUIT OPEN BAS SOLENOID VALVE CONTROL CIRCUIT OPEN BAS SOLENOID VALVE (BRAKE BOOSTER) CONTROLLER ANTILOCK BRAKE For a complete Brake Assist System (BAS) Circuit Diagram (Refer to 5 - BRAKES/ELECTRICAL - SCHEMATICS Diagnostic Test 1. MEASURE THE RESISTANCE OF THE BAS SOLENOID VALVE 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the CAB harness connector. Disconnect the BAS Brake Booster C2 harness connector. Note: Check connectors - Clean/repair as necessary. Is the resistance below 5.0 ohms? Yes >> Go to 2 No >> Repair the BAS Solenoid Valve 5-Volt Supply circuit for an open. Perform ABS VERIFICATION TEST. ZH BRAKES - ABS ELECTRICAL DIAGNOSTICS 5 - 237 |