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If less than the specified range, test the 5-volt reference circuit for a short to ground or If greater than the specified range, test the 5-volt reference circuit for a short to 4. If all circuits test normal, test or replace the trailer brake controller switch panel. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for TBCM replacement, setup, and programming DTC C1112 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC C1112 Trailer Brake Control Relay Low Control Circuit - Relay Control Active Low Diagnostic Fault Information Circuit/System Description The trailer brake control module (TBCM) diagnostic monitor detects faults on the solid state Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance Relay Control Active Low C1112 - C1112 C1112 - TBCM Relay Control Circuit C1112 - C1112 C1112 - SSR Fuse STUD 2 Power - - C1112 - -
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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