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If greater than the specified range, test the signal circuit terminal 4 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 Trailer Brake Control Module Replacement DTC C1116 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 C1116 Manual Trailer Brake Apply Request Signal 1 Diagnostic Fault Information Circuit/System Description The primary manual apply switch circuit diagnostic monitors for circuit faults on the primary This DTC will also be set as current DTC when a fault is detected in 5 v reference voltage or in Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance 5-Volt Reference Circuit C1116 - C1116 C1116 - TBCM Manual Apply Signal - - C1116 - - TBCM Ground Circuit - - C1116 - -
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Conditions for Running the DTC The system voltage is in the range of 9.5 - 17 volts. The module is powered up and completes initialization. Conditions for Setting the DTC DTC C1116 will set as current DTC, if one of the following conditions is true: The TBCM detects an open in the manual apply signal circuit. The TBCM detects short to ground in the manual apply signal 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 If there are any DTCs set for GMLAN communication such as U0100, U0121, U0140, or U2099, When the manual apply switch 5-volt reference circuit or TBCM ground is open circuit, in Reference Information Schematic Reference Trailer Brake Control Schematics
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Primary Manual Apply parameter. The reading should be between 0-100 percent and change with brake pedal input. 2. Ignition ON, observe the scan tool brake controls Redundant Manual Apply parameter. The reading should be between 0-100 percent and change with brake pedal input. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the trailer brake controller switch panel. 2. Test for less than 5 ohms of resistance between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 3. Ignition ON, test for 4.8 - 5.2 volts between the 5-volt reference circuit terminal 3 and ground. If less than the specified range, test the 5-volt reference circuit for a short to ground or 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 greater than the specified range, test the 5-volt reference circuit for a short to 4. Install a 3A fused jumper wire between the signal circuit terminal 4 and the 5-volt reference circuit terminal 3. Verify the scan tool Manual Apply Switch is greater than 90 percent. If less than the specified range, test the signal circuit for a short to ground or an 5. 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 Trailer Brake Control Module Replacement DTC C1117 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 C1117 Manual Trailer Brake Apply Request circuit Signal 2-Redundant Manual Apply Signal Diagnostic Fault Information Circuit/System Description Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance TBCM 5-Volt Reference C1117 - C1117 C1117 - Redundant Manual Apply - - C1117 - - TBCM Ground Circuit - - C1117 - -
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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