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Home >> Pontiac >> 2005 >> Aztek Base, AWD >> Repair and Diagnosis >> Brakes >> Antilock Brake System And Traction Control System >> Diagnostic Information and Procedures >> DTC C0121 >> Circuit Description
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Circuit Description

The solenoid valve relay supplies power to the solenoid valve coils in the electronic brake control module (EBCM). The solenoid valve relay, located in the EBCM, is activated whenever the ignition switch is in the RUN position, and no faults are present. The solenoid valve relay remains engaged, until the ignition is turned OFF, or a failure is detected.