INTRODUCTION
Note. Before replacing any component that scan tool suggests are faulty, ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. For circuit identification, see appropriate WIRING DIAGRAM under ENGINE PERFORMACE in SYSTEM WIRING DIAGRAMS for vehicle being tested.
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 memories may exist
- Seat position.
- Tilt/telescoping steering wheel position.
- Mirror position.
- Radio presets and anti-theft code.
- Clock.
- Remote keyless entry custom features.
- Door key lock entry custom features.
- Power window or sunroof operation.
These do not affect vehicle operation. For systems that do not affect operation, see appropriate article for relearn procedures. Other computer relearn procedures are required for vehicle or system operation. These may include
- Initial control unit programming.
- Traction control yaw sensor initializing.
- Multiplex communication.
- Anti-theft system or engine immobilizer system passwords.
ENGINE CONTROLS
Vehicles equipped with powertrain control computers may require a computer relearn procedure after the vehicle battery is disconnected. Vehicle computers memorize and store vehicle operation patterns for optimum driveability and performance. When the vehicle battery is disconnected, this memory is lost, which may result in a driveability problem. Depending on the vehicle and how it is equipped, the following driveability problems may exist
- Rough or unstable idle.
- Hesitation or stumble.
- Rich or lean running.
- Poor fuel mileage.
- Harsh or poor transmission/transaxle shift quality.
Default data is used until NEW data from each key start is stored. As the computer restores its memory from each new key start, driveability is restored.
Driveability problems may occur during the computer relearn stage. To accelerate computer relearn process after battery removal and installation, specified computer relearn procedures should be performed. See appropriate procedures for specified manufacturer.
ALL MODELS
Note. When DME control unit is disconnected or its power supply interrupted, all stored intermittent DTCs as well as substitute values are cleared/lost. Current hard DTCs cannot be cleared.
After disconnecting battery or replacing DME control unit, drive vehicle to enable DME control unit to relearn driveability. Inform your customer that they may experience driveability different from what they are accustomed to until DME control unit completes relearn function. System Readiness Test (SRT) information was not available from manufacturer.
COMPONENT ACTIVATION
Use BMW MoDIC (hand-held scan tester), BMW Service Tester (Sun 2013 Engine Analyzer) and applicable BMW diagnostic software to activate components. Select DRIVE COMPONENTS MODE (D300). Detailed information on this mode is displayed on screen.
7-Series
Ensure window to be initialized is in full open position. Close door of window that needs to be initialized. Press and hold window switch all the way down for approximately 17 seconds. Lift switch and hold up. Window will move up through its full travel, then down and back up again. Test function of toll feature.
Except 7-Series
Power windows will require calibration to establish upper and lower stop points if battery is disconnected. Turn ignition on. Lower window(s) to stop and hold switch for 5 seconds. Raise window(s) to stop and hold switch for 5 seconds. Turn ignition off.
3-Series
Push sun roof button in up/tilt direction and hold. After about 20 seconds, sunroof panel will make a small down-up movement. Release button for no more than 5 seconds and push and hold it in up/tilt direction again. Sun roof will run through a full open and close cycle. Once this cycle is completed, initializaton and adaptation is complete.
Note. If motor runs in the wrong direction when pushing the button in the up/tilt direction, preventing proper initialization, get the sunroof to the closed position, and disconnect power to the motor for about 15 seconds. Reconnect the motor and start the initialization procedure again, and it should work properly.