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Home >> Saturn >> 2005 >> L300 >> Repair and Diagnosis >> Brakes >> Antilock Brake System And Traction Control System >> Diagnostic Information And Procedures >> DTC C0121 >> Circuit Description

Circuit Description

The antilock brake system (ABS) control module uses a relay to control the valve solenoids. When the ignition is in the Run position, the module energizes the relay winding to switch the battery voltage that supplies the solenoids. The module will disable the relay when the ignition is OFF, or a fault is detected.

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