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The redundant manual apply switch circuit diagnostic monitors for circuit faults on the redundant This DTC will also be detected when a fault is detected in the 5 v reference voltage or in TBCM 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 C1117 will set as current DTC, if one of the following conditions is true: The TBCM detects an open in the redundant manual apply signal circuit. The TBCM detects short to ground in the redundant manual apply signal circuit. The TBCM detects short to battery positive in the redundant 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
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 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. 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 the circuit tests normal, replace the TBCM. 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 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 5 and the 5-volt reference circuit terminal 3. Verify the scan tool Redundant Manual Apply Switch is greater than 90 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 C1118 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provide an overview of each diagnostic category. DTC Descriptor DTC C1118 Trailer Brake Control Sensitivity Switch Circuit DTC C1118 08 Trailer Brake Control Sensitivity Switch Circuit Signal Invalid Diagnostic Fault Information
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The User Gain Switch consists of 2 control buttons: Gain Up, and Gain Down. The output signal The TBCM monitors the circuit fault for User Gain Switch input for faults that includes short to The TBCM also monitors the input signal validity from the User Gain Switch. 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 C1118 will set as current DTC, if one of the following conditions is true for more then 1 The TBCM detects an open in the user gain switch circuit. The TBCM detects short to ground in the user gain switch circuit. The TBCM detects short to battery positive in the user gain switch circuit. DTC C1118 08 will set as current, if one of the following cases is true: The TBCM detects the user gain switch is stuck before the ignition is on, and continuously The TBCM detects the user gain switch is stuck continuously after ignition was turn on for 5 Action Taken When the DTC Sets Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance TBCM User Gain switch C1118 - C1118 C1118 C1118 08 TBCM Ground Circuit - - C1118 - -
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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