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DIAGNOSTIC STARTING POINT - CRUISE CONTROL Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic The identification of the control modules which command the system The ability of the control modules to communicate through the serial data circuit The identification of any stored DTCs and their status The use of the Diagnostic System Check will identify the correct procedure for diagnosing the DTC B3794 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 Descriptors DTC B3794 08 Cruise Control Function Request Circuit Signal Invalid DTC B3794 61 Cruise Control Function Request Circuit Actuator Stuck Diagnostic Fault Information Stuck DTC B0835 B0835 00: Cruise Control System Active Indicator Circuit DTC P0571 P0571 00: Cruise Control Brake Switch Circuit DTC P0572 or P0573 P0572 00: Brake Switch Circuit 1 Low Voltage P0573 00: Brake Switch Circuit 1High Voltage DTC P0575 P0575 00: Cruise Control Switch Signal Circuit DTC P0703 P0703: Brake Switch Circuit
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The body control module (BCM) supplies battery voltage to the cruise control switch. The cruise Conditions for Running the DTC The ignition is ON. The cruise switch is ON. Conditions for Setting the DTC B3794 08 The BCM detects an invalid voltage signal on the cruise control switch signal circuit is present B3794 61 The BCM detects an valid voltage signal on the cruise control switch signal circuit is present for Action Taken When the DTC Sets The BCM stores the DTC information into memory when the diagnostic runs and fails. The malfunction indicator lamp (MIL) will not illuminate. The Cruise Control System is disabled. Conditions for Clearing the DTC The DTC becomes history when the conditions for setting the DTC are no longer present. Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance Cruise Control Switch 1 B3794 08 1 - B3794 08 Cruise Control Switch Signal 1 B3794 08 1 B3794 08 B3794 08 1. Cruise Control Inoperative/Malfunctioning
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The history DTC clears after 100 malfunction-free warm-up cycles. Reference Information Schematic Reference Cruise Control Schematics Steering Wheel Secondary/Configurable Control Schematics 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 Verification Ignition ON, observe the scan tool Cruise Control Switch parameter in the BCM. While pressing Circuit/System Testing 1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement . 2. Disconnect the harness connector at the cruise control switch. 3. Ignition ON, test for B+ between the supply circuit terminal 1 and ground.
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If less than the specified range, test the supply circuit for a short to ground or an 4. Verify the scan tool Cruise Control Switch parameter is OFF. If not the specified value, test the signal circuit terminal 3 for a short to voltage. If the 5. Ignition OFF, connect the harness connector at the cruise control switch. 6. Ignition ON, cruise control switch ON, observe the scan tool Cruise Control Switch parameter. The parameter should display ON. If not the specified value, test the signal circuit terminal 3 for a short to ground or an 7. Observe the scan tool Cruise Control Switch parameter while pressing the RES + portion of the cruise control switch. The parameter should display Resume. If not the specified value, test or replace the cruise control switch. 8. Observe the scan tool Cruise Control Switch parameter while pressing the SET - portion of the cruise control switch. The parameter should display Set. If not the specified value, test or replace the cruise control switch. 9. Observe the scan tool Cruise Control Switch parameter while pressing the Cancel portion of the cruise control switch. The parameter should display Cancel. If not the specified value, test or replace the cruise control switch. 10. If all circuits and the component test normal, replace the BCM. Component Testing 1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement . 2. Remove the steering wheel cruise control switch. Refer to Steering Wheel Control Switch Assembly Replacement . 3. Connect a DMM between terminals 1 and 3 of the cruise control switch. Cruise control ON/OFF switch ON, measure the resistance while individually activating and holding each IMPORTANT: The cruise control switch must be ON in order to properly measure the resistance of the -/SET, the +/RES, and the Cancel
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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