0 Electrical power supply -general · Work instructions after disconnecting the battery

911 Carrera (996) Entire vehicle -General 0 0 Electrical power supply -general Work instructions after disconnecting the battery Effect of disconnection or total discharge of Control module memories: the battery on electrical systems in the vehicle, subsequent measures: Values and faults stored in the control modules 1. Never disconnect battery with engine running. can be deleted if the battery is disconnectedor completelydischarged. 2. Never start engine without securely connected battery. Remedy: If possible, all fault memories should be 3. Do not use a boost charger to start the checked and, if necessary,printed out before engine. the battery is disconnected. 4. Wheneverpossible, use jump leads with Supply voltage fault entry: overvoltageprotection. 5. Always disconnect the battery terminals The entry "supply voltage" could be stored in before carrying out welding work on the various control modules if the battery has been vehicle. completelydischarged. 6. Wiring harness plugs of control modules or Remedy: other electronic components must be Delete the "supplyvoltage" entry from the connected or disconnectedwith the ignition control modules in question. oft. Exception: vehicleswith the additional equipment M 536 (alarm siren with tilt Test drive after connecting the battery: sensor). The fault memories of all vehicle control Note concerning M 536: modules should be read out again after the test In order to avoid triggering the alarm siren drive. (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). 0 Electrical power supply -general 0 -49 Printed in Germany -33, 1999 996O_49.