Aura L4-2.4L (2008)
Cruise Control: Symptom Related Diagnostic Procedures
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 (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle), before using the Symptom Tables in order to verify that all of the following are true:
*
There are no DTCs set.
*
The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Cruise Control Description and Operation (See:
Description and Operation).
Visual/Physical Inspection
*
Inspect for aftermarket devices which could affect the operation of the Cruise Control System. Refer to Checking Aftermarket Accessories (See:
Testing and Inspection/Component Tests and General Diagnostics).
*
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 Malfunction (See: Cruise Control Malfunction) in order to diagnose the system.
Cruise Control Malfunction
Cruise Control Malfunction
Diagnostic Instructions
*
Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
*
Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
*
Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Circuit/System Description
The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control set/coast and resume/accelerate switch
signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the
cruise control switch signal circuit when a switch is applied. The BCM sends a serial data message to the engine control module (ECM), indicating the
status of the cruise control switches.
Reference Information
Schematic Reference
Cruise Control Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Cruise Control Description and Operation (See: Description and Operation)
Electrical Information Reference
