Body Controls

Vehicles equipped with body, air conditioning, anti-lock brake or memory computers may require a computer relearn procedure after components are replaced or the vehicle battery is disconnected. Vehicle computers memorize and store vehicle information and operation selections. When the vehicle battery is disconnected, vehicle computer memory may be lost, requiring relearning or resetting. Depending on the vehicle and how it is equipped, the following secondary memories may exist:

• Air conditioning.
• Clock.
• Door key lock entry custom features.
• Mirror position.
• Power window or sun roof operation.
• Radio presets and anti-theft code.
• Remote keyless entry custom features.
• Seat position.
• Tilt/telescoping steering wheel position.

These do not affect primary vehicle systems. For secondary vehicle systems, see appropriate article for relearn procedures. Other computer relearn procedures are required for primary vehicle system operation. These may include:

• Initial control unit programming.
• Traction control yaw sensor initializing.
• Multiplex communication.
• Anti-theft system or engine immobilizer system passwords.