Introduction Note concerning M 536: · In order to avoid triggering the alarm siren

911 Carrera (996) Instrument cluster diagnosis Introduction Note concerning M 536: In order to avoid triggering the alarm siren The manual contains the diagnosis for the (installedon right next to the battery) of vehicles following system: with M 536, terminal 86 S of the battery must be disconnectedwith the ignition on (all loads Instrumentcluster must be switched off beforehand), Electrical power supply -general Instrument cluster The trip counter is set to 0 when the power Work instructions after disconnecting the supply is disconnected. battery Effects of disconnection or total discharge of Clock: the battery on electrical systems in the vehicle, Dependingon the software version, the clock is subsequent measures: set to 12:00 a.m. or 1:00 a.m. when the power supply is disconnected. Never disconnect battery with engine running. Remedy: Never start engine without securely Enter the current time again. connected battery. On-board computer Never use a boost charger to start the Disconnectionof the vehicle battery deletesthe engine. memories for average speed and average consumption. As a result, the displayed range Wheneverpossible, use jump leads with on remainingfuel can be markedly different or overvoltageprotection. even O. The outside temperature indicator loses its memory effect. In other words, the indicated Plug connectors of control modules or outside temperature can be too high due to the other electronic components must never be heat radiated when the vehicle is hot. connected or disconnectedwith the ignition switched on. Exception:vehicles with the additional equipment M 536 (alarm siren with tilt sensor). 90 25 Diagnosis/Troubleshooting, instrument cluster 90 -D 77