Yukon Denali AWD V8-6.2L (2007)
Cruise Control: Symptom Related Diagnostic Procedures
A Symptoms - Cruise Control
SYMPTOMS - CRUISE CONTROL
IMPORTANT: The following steps must be completed before using the symptom tables.
1. Perform the Diagnostic System Check - Vehicle, before using the Symptom Tables in order to verify that all of the following are true:
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There are no DTCs set.
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The control modules can communicate via the serial data link. See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Diagnostic System Check - Vehicle
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Cruise Control Description and Operation.
Visual/Physical Inspection
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Inspect for aftermarket devices which could affect the operation of the Cruise Control System.
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Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.
See: Testing and Inspection/Component Tests and General Diagnostics
Symptom List
Refer to Cruise Control Inoperative/Malfunctioning.
Cruise Control Inoperative/Malfunctioning
CRUISE CONTROL INOPERATIVE/MALFUNCTIONING
DIAGNOSTIC FAULT INFORMATION
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Diagnostic System Check - Vehicle
CIRCUIT/SYSTEM DESCRIPTION
The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate,
and cancel switch signal circuits in order to detect when a cruise control function switch has been activated. The BCM detects a predetermined voltage
signal when a cruise control function switch is applied, with each switch having a different voltage value.
Conditions for Enabling Cruise Control
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The vehicle speed is greater than 40 km/h (25 mph).
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The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear.
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The system voltage is within 9-16 volts.
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The park brake or brakes is not applied.
CIRCUIT/SYSTEM VERIFICATION
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Ensure that the following cruise control switches are not stuck in the engaged position:
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ON/OFF switch
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- Set switch
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+ RES switch
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Cancel switch
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Inspect for proper operation of the stop lamps.
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Rotate the steering wheel to both steering stops while activating each cruise control switch separately. With a scan tool, observe the Cruise Control
Switch parameters in the BCM. Ensure that each cruise control switch activated and that each displayed switch position in the Cruise Control
Switch parameter match as the steering wheel is turned. This will help eliminate the possibility of an internally open or shorted inflatable restraint
steering wheel module coil.
CIRCUIT/SYSTEM TESTING
CAUTION: Refer to SIR Caution.
Disable the inflatable restraint steering wheel module when performing this diagnostic.
1. Ignition OFF, remove the inflatable restraint steering wheel module.
2. Disconnect the harness connector of the cruise control switch.
3. Ignition ON, measure for 10 volts or greater at the cruise control supply voltage circuit.
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If less than 10 volts, check for an open/high resistance or for a short to ground on the cruise control supply voltage circuit.
