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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. Diagnostic Fault Information Circuit/System Description The cruise control switch contains an LED that illuminates to indicate the cruise control system Diagnostic Aids This diagnostic assumes the cruise control system is operating properly and no DTCs are set. If If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . Reference Information Schematic Reference Cruise Control Schematics Connector End View Reference Component Connector End Views Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance Cruise Control Switch Supply 1 1 1 - - Cruise Control Indicator 3 2 2 2 - 1. Cruise Control Inoperative 2. Indicator Lamp Inoperative 3. Indicator Lamp Dimming Inoperative
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Engine ON, press and release the cruise control ON/OFF switch while observing the Cruise Circuit/System Testing Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to 1. Ignition ON, with a scan tool observe the Cruise On/Off Switch parameter. Verify the parameter changes each time the switch is actuated If the parameter reads ON at all times replace the cruise control switch. 2. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement . 3. Disconnect the harness connector at the cruise control switch assembly. 4. Ignition ON, test for 0 volts between the cruise control harness connector terminal 9 and ground. If voltage is present, test the circuit for a short to voltage. 5. Ignition OFF, disconnect the X3 connector at the BCM. 6. Test for less than 1.0 ohm between the cruise control harness connector terminal 9 and the BCM connector X3 terminal 22. If greater than the specified value, test the circuit for an open or high resistance. CAUTION: Refer to SIR Caution .
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
7. Test for infinite resistance between the cruise control harness connector terminal 9 and ground. If resistance is measured, test the circuit for a short to ground. 8. If all circuits test normal, test the component. If the circuits and component tests are normal, replace the BCM. Component Testing Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to 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. Turn the cruise control switch ON. Connect a DMM positive lead to terminal 1 and the negative lead to terminal 9 of the cruise control switch and measure the resistance. Verify If the reading indicates an open circuit, replace the cruise control switch assembly. 4. Connect the DMM positive lead to terminal 9 and the negative lead to terminal 1 of the cruise control switch and measure the resistance. Verify the meter reading indicates an open If the reading is not as specified, replace the cruise control switch assembly. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Steering Wheel Control Switch Assembly Replacement Control Module References for BCM replacement, setup, and programming CRUISE CONTROL INDICATOR MALFUNCTION (IPC INDICATOR MALFUNCTION) CAUTION: Refer to SIR Caution . IMPORTANT: The cruise control switch must be ON in order to properly test the switch indicator.
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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. Circuit/System Description The instrument panel cluster (IPC) illuminates the cruise control engaged indicator based on Diagnostic Aids This diagnostic assumes the cruise control system is functioning normally and there are no If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . Reference Information Schematic Reference Cruise Control Schematics Instrument Cluster Schematics Connector End View Reference Component Connector End Views Description and Operation Cruise Control Description and Operation Indicator/Warning Message Description and Operation Electrical Information Reference Circuit Testing Connector Repairs
2008 Chevrolet Silverado 1500 2008 ENGINE Cruise Control - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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