18 · Diagnostics

B01 Ignition switch not working

Fault diagnosisB01 Ignition switch not working

When the ignition is turned ON nothing happens. The starter motor does not turn, the instruments do not light up

Step	Test procedure	Result	Action
1	BATTERY EFFICIENCY CHECK Check the efficiency of the battery using the appropriate diagnostic equipment	OK	Move onto step 2
1		Battery not working properly	Replace battery End of diagnosis
2	CHECK FASTENINGS Check, in order: Correct fixing or connection to earth of negative battery terminal Correct fixing of positive battery terminal and that all leads are connected No oxidation of the cable fastenings Correct fixing and connection between positive terminal and control unit with maxifuse at battery	OK	Move onto step 3
		Cable fastenings at battery slack	Tighten cables End of diagnosis
		Earth lead frayed	Replace lead Op. 5530B22 End of diagnosis
		Connections with slack fastenings	Restore fastenings End of diagnosis
		Maxifuse burnt	Check the causes of the burnt fuse and replace it: wiring diagram Wiring diagram E1010 POWER SUPPLY End of diagnosis
3	SUPPLY CHECK Check switch supply	OK	Move onto step 4
3	SUPPLY CHECK Check switch supply	No supply reaches the switch	Check the continuity of the wiring between the maxifuse at the battery control unit and the switch End of diagnosis
4	SWITCH CHECK Check condition and correct operation of the switch	OK	Move onto step 5
4		Switch contacts not working properly	Replace switch Op. 5520A12 End of diagnosis
5	CORRECT OPERATION CHECK Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
5		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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