9 Work instructions after disconnecting the battery · Effect of disconnection or total Control module memori

911 Carrera (996) General 9 Work instructions after disconnecting the battery Effect of disconnection or total Control module memories: discharge of the battery on electrical systems in the vehicle, subsequent Values and faults stored in the control modules measures,: can be deleted if the battery is disconnectedor completely discharged. Never disconnect battery with engine running. Remedy: 2. Never start engine without securely connected If possible, all fault memories should be battery. checked and, if necessary,printed out before the battery is disconnected. 3. Do not use a boost charger to start the engine. Supply voltage fault entry: 4. Wheneverpossible, use jump leads with The entry "supplyvoltage" could be stored in overvoltageprotection. various control modules if the battery has been 5. Always disconnect the battery terminals completelydischarged. before carrying out welding work on the Remedy: vehicle. Delete the "supply voltage" entry from the 6. Wiring harness plugs of control modules or control modules in question. other electronic components must be connected or disconnectedwith the ignition Test drive after connecting the battery: off. Exception: vehicles with the additional equipment M 536 (alarm siren with tilt The fault memories of all vehicle control sensor). modulesshould be read out again after the test drive. Note conclerning M 536: In order to avoid triggering the alarm siren (installed on right next to the battery) of vehicles with M 536, the battery must be disconnected with the ignition on (all loads must be switched off beforehand), 9 Work instructions after disconnecting the battery 9 -1 Printed in Germany -33, 1999 9969_1