Initial Inspection and Diagnostic Overview

Speed Control

Inspection and verification

1. Verify the customer concern.
2. Visually inspect for obvious mechanical or electrical faults.

Mechanical Electrical
^ Fuses
^ Speed control sensor
^ Speed control sensor ^ Speed control switches
condition and fitment
^ Speed control switches ^ Forward alert switch
^ Forward alert switch ^ Brake switches
^ Brake switches ^ Adaptive speed control module
^ Tire size and condition ^ Engine control module (ECM)
^ ABS control module
^ Controller area network (CAN) circuits

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the DTC index.
^ Because the DTCs are stored in more than one module, a complete vehicle read is recommended

Because the DTCs are stored in more than one module, a complete vehicle read is recommended
^ Make sure that all DTCs are cleared following rectification.

Make sure that all DTCs are cleared following rectification.