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Schematic Reference Trailer Brake Control Schematics Description and Operation Trailer Brake Controls Description and Operation Connector End View Reference Component Connector End Views Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for Scan Tool Information Circuit/System Verification 1. Ignition ON, observe the scan tool brake controls Trailer Brake Relay Status parameter. The reading should be Enabled or Disabled. 2. Ignition ON, observe the scan tool brake controls TBCM Command Duty Cycle parameter. The reading should be 0 - 100 percent. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the solid state relay module. 2. Test for less than 5 ohms of resistance between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, test for 9 - 11 volts between the 10-volt relay control circuit terminal E and ground. IMPORTANT: All electrical components and accessories must be turned OFF and allowed to power down.
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If less than the specified range, test the 10-volt relay control circuit for a short to If greater than the specified range, test the 10-volt relay control circuit for a short to 4. Ignition OFF, reconnect the harness connector at the solid state relay module. 5. Connect a test lamp between the control circuit terminal C of the trailer connector and the ground circuit terminal B. 6. Command the trailer brake relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the If the test lamp is always OFF, test the control circuit for a short to ground or an 7. If all circuits test normal, test or replace the trailer brake solid state relay (SSR). Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Trailer Brake Control Module Replacement Control Module References for TBCM replacement, setup, and programming DTC C1114 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 C1114 Trailer Brake Control Solenoids Control Circuit-Trailer Auxiliary Supply Voltage Diagnostic Fault Information Short to High Short to Signal
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The trailer brake control module (TBCM) monitors for faults on the trailer brake solid state relay Conditions for Running the DTC The system voltage is in the range of 9.5 - 17 volts. The 5 volt supply for the SSR output auxiliary supply circuit is not faulted and DTC C0870 The SSR relay control circuit fault DTC C1112 is not set as current DTC. Conditions for Setting the DTC DTC C1114 will set as current DTC, if one of the following conditions is true: The TBCM detects an open in the trailer auxiliary supply voltage circuit. The TBCM detects short to ground in the trailer auxiliary supply voltage circuit. The TBCM detects short to battery positive in the manual apply signal circuit. Action Taken When the DTC Sets The trailer brake control will be disabled for the remainder of the ignition cycle. The Service Trailer Brake System will be displayed on the Driver Information Center Condition for Clearing the MIL/DTC When the condition for the DTC is no longer present. The TBCM automatically clears the history DTC when a current DTC is not detected in 40 Diagnostic Aids Circuit Ground Resistance Open Voltage Performance Trailer Auxiliary Supply C1114
C1114 C1114 - SSR Relay Control Circuit C1114 - - - - SSR Ground Circuit - - C1114 - -
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If there is an aftermarket trailer brake controller, the ITBC must be disconnected. Do not power Reference Information Schematic Reference Trailer Brake Control Schematics Description and Operation Trailer Brake Controls Description and Operation Connector End View Reference Component Connector End Views Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for Scan Tool Information Circuit/System Verification 1. Ignition ON, observe the scan tool brake controls Trailer Brake Relay Status parameter. The reading should be Enabled or Disabled. 2. Ignition ON, observe the scan tool brake controls TBCM Command Duty Cycle parameter. The reading should be 0 - 100 percent. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the solid state relay module. IMPORTANT: All electrical components and accessories must be turned OFF and allowed to power down.
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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