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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 control circuit terminal E and ground. If less than the specified range, test the 10-volt control circuit for a short to ground or If greater than the specified range, test the 10-volt control circuit for a short to voltage. 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 C1115 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 C1115 08 Manual Trailer Brake Apply Request Switch Signal Invalid-Manual Apply Switch Stuck
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Closed DTC C1115 5A Manual Trailer Brake Apply Request Switch Signal Plausibility Failure Diagnostic Fault Information Circuit/System Description The manual apply switch rationality diagnostic monitors for circuit rationality faults on the Manual Trailer Brake Apply Request Switch Signal Invalid" diagnostic monitors for a manual Manual Trailer Brake Apply Request Switch Signal --plausibility failure diagnostic monitors for Conditions for Running the DTC DTC C1116 or C1117 are not set as current 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 C1115 08 Manual trailer brake apply request switch signal invalid fault is detected when any one of the Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance TBCM Manual Apply Signal - - - C1115 5A C1115 08
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
following conditions is true: The ignition is turned from Off to On, the Manual Apply Switch is not activated, then it is The ignition is Off, the Manual Apply is already activated, and then turn on the ignition, and C1115 5A Manual Trailer Brake Apply Request Switch Signal plausibility failure: The ignition is turned from Off to On, the Manual Apply Switch is not activated, then it is The fault is detected if the absolute value of the difference between the primary manual 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 trailer brake apply switch is shorted to ground, shorted to battery, or open Reference Information
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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. 3. Verify the scan tool Manual Apply Switch is less than 10 percent. 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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