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1. Verify that B3794 is not set as current. If B3794 is set as current, refer to DTC B3794. 2. Road test the vehicle and attempt to engage cruise. Verify that cruise control engages properly and that DTC P0575 is not set. If the cruise control system does not operate properly and DTC P0575 is not set, refer If DTC P0575 sets as current, replace the BCM. Clear the DTC and road test the vehicle Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for BCM or ECM replacement, setup, and programming DTC P0703 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 P0703 Brake Switch Circuit IMPORTANT: This DTC may be stored as a history DTC without affecting Using the Failure Records data may help locate an
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The body control module (BCM) monitors the stop lamp switch, mounted on the brake pedal. Conditions for Running the DTC The engine is ON. Conditions for Setting the DTC The ECM receives an invalid brake pedal status GMLAN serial data message from the This diagnostic runs continuously. Action Taken When the DTC Sets The Cruise Control System is disabled. The ECM stores the DTC information into memory when this diagnostic runs and fails. The malfunction indicator lamp (MIL) will not illuminate. All of the scan tool cruise control function switch parameters are set to Off. Conditions for Clearing the DTC A last test failed, or the current DTC, clears when the diagnostic runs and does not fail. A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by Use the scan tool in order to clear the DTC. Diagnostic Aids Ensure all the stop lamps operate properly. Refer to Exterior Lighting Systems Description Reference Information Schematic Reference Cruise Control Schematics Exterior Lights Schematics
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Connector End View Reference Component Connector End Views Description and Operation Cruise Control Description and Operation 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 Testing 1. Verify proper operation of the vehicle stop lamps. refer to Exterior Lighting Systems Description and Operation . If the vehicle stop lamps do not operate as described, refer to Symptoms - Lighting . 2. Ignition ON, press and release the brake pedal several times. With a scan tool, verify DTC P0703 is not set as current in the ECM. If DTC P0703 is current in the ECM, replace the BCM. 3. The system is OK. Clear the history DTC. Do not replace any components. Repair Procedures IMPORTANT: Repair any Brake System related DTCs before using this diagnostic. IMPORTANT: This DTC may be stored as a history DTC without affecting the operation of the BCM. Do not replace the BCM if this DTC is
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Control Module References for BCM replacement, setup, and programming SYMPTOMS - CRUISE CONTROL 1. Before using the symptom diagnostic table, perform the Diagnostic System Check - Vehicle , in order to verify the following conditions: There are no DTCs set. The module can communicate via the serial data link. 2. Review the system operation in order to understand the system functions. Refer to Cruise Control Description and Operation. Visual/Physical Inspection Inspect for aftermarket devices which can affect the operation of the cruise control system. Inspect the accessible system components or the visible system components for obvious 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 Cruise Control Malfunction Cruise Control Indicator Malfunction (Switch Indicator Malfunction) or Cruise CRUISE CONTROL INDICATOR MALFUNCTION (SWITCH INDICATOR MALFUNCTION) Diagnostic Instructions IMPORTANT: The following steps must be completed before using the symptom tables.
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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