Battery Disconnect Precautions

CAUTION: Turn ignition off. Before disconnecting negative battery terminal, obtain anti-theft radio security code. Disconnect negative battery terminal. After reconnecting battery, re-code and check operation of anti-theft radio.

If the connector is disconnected from the ECM or the battery is disconnected, all adaptation values in the control module are erased. DTC memory content will remain intact however. If the engine is started after this, a rough, uneven idle can result. In this case, engine must be allowed to run at idle for a few minutes or a longer road test must be performed until the adaptation procedure has been completed.

Once battery has been connected, check operation of radio, clock and convenience electronics. Completely open and close all power windows.

NOTE: Vehicles with On Board Diagnostics (OBD) II must have readiness code for Electronic Control Module (ECM) re-generated after battery has been disconnected. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.