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Scan Tool Reference Control Module References Circuit/System Verification 1. Ignition ON, observe the scan tool brake controls TBCM Relay Feedback Signal volts parameter. The reading should be between 4.8 - 5.2 volts. 2. Ignition ON, observe the scan tool brake controls Trailer Brake Relay Command volts parameter. The reading should be battery volts. 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 4.8 - 5.2 volts between the 5-volt reference circuit terminal D 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. If all circuits test normal, test or replace the SSR driver module. 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 SYMPTOMS - TRAILER BRAKE CONTROLS IMPORTANT: All electrical components and accessories must be turned OFF and allowed to power down. IMPORTANT: The following steps must be completed before using the symptom tables.
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the Trailer Brake For vehicles displaying a TRAILER NOT CONNECTED message with a trailer connected. Inspect the trailer brake connector and circuits for proper connections, perform the 1. Verify SSR circuit 47 pin A to the trailer connector pin C for continuity. 2. Verity SSR circuit 1750 pin B to ground and to the trailer connector pin B for continuity. If all circuits test normal the vehicle TBCM system is not at fault, otherwise most associated Insure the trailer is equipped with electric over electric brakes - only trailers equipped with If the trailer is equipped with hydraulic brakes this trailer will not be recognized by the The Trailer brake connector should measure less than 2 ohms of resistance between pins A Symptoms Testing Some customers may experience an intermittent Check Trailer Wiring message in vehicles Check Trailer Wiring Message on the DIC 1. Perform the Brake System Vehicle Road Test before using the Trailer Brake Controls symptom tables in order to 2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following: Trailer Brake Controls Description and Operation ABS Description and Operation (With JL4) ABS
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. This condition is caused by insufficient grounding between the trailer and vehicle. To correct this condition, perform the following procedure: Inspect and clean the ground wire (white wire) connection on the trailer side of Make sure that the wires inside the trailer side connector are clean and securely If an electrical junction box exists on the trailer, make sure the wires inside the Once this procedure is complete, check to see if the condition has been corrected: Remove the original trailer ground wire (white wire) from the trailer side of the Install a ring terminal (PN 12103512 or equivalent) to this wire and fasten the Pre-drill trailer chassis location with a 3/16" hole. Make sure the trailer chassis Obtain a sufficient length of minimum 10 gauge (5.0 mm2) white wire and fasten with Install and fasten the other end of the new ground wire into the trailer side of the 7-pin Install conduit on the original and new trailer ground wires, and secure the conduit to 2. Verify the condition has been corrected. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the Brake Warning Indicator Malfunction
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
REPAIR INSTRUCTIONS TRAILER BRAKE CONTROL SWITCH REPLACEMENT Fig. 3: View Of Trailer Brake Control Switch TRAILER BRAKE CONTROL MODULE REPLACEMENT Callout Component Name Preliminary Procedure: 1 Trailer Brake Control Switch Procedure 1. Disconnect the electrical connectors. 2. Use a plastic flat bladed tool to release the switch from the knee bolster trim.
2008 Chevrolet Silverado 1500 2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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