27 · Electrical

Bad radio reception

Make: Alfa Romeo
Model: 155 Factory Service Manual
Year: 1992–1998
Section: Troubleshooting › Bad radio reception

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Electrical 15 – Provision for radioBad radio reception

RADIO NOT WORKING	TEST A
	TEST PROCEDURE	RESULT	CORRECTIVE ACTION
A1	CHECK FUSE - Check for damage of fuse F2 in fusebox G1	OK	Carry out step A2
	NOT OK	Replace fuse (20A)
	A2	CHECK VOLTAGE - Verify 12V between pins C2 and C1 of the radio O4	OK	Check and if necessary replace the radio O4
NOT OK		Carry out step A3
A3		CHECK VOLTAGE - Verify 12V at pin C2 of O4	OK	Restore wiring between pin C1 of O4 ground G148b, also across the solder (BLK)
	NOT OK	Restore wiring between pin H4 of G1 and pin C2 of O4, across pin 2 O6 (RED-YEL and RED)

BAD RADIO RECEPTION

NOTE: anomalies and defects in the aerial/heated rear window control unit may be connected to the malfunctioning of the heated rear winscreen device (see "Heated rear window, heated adjustable rear-view mirrors")

	TEST PROCEDURE	RESULT	CORRECTIVE ACTION
B1	CHECK CONTINUITY - Check the continuity between pin A5 of the radio O4 and pin A2 of heated rear windscreen/aerial control unit N49	OK	Carry out step B2
	NOT OK	Restore wiring between pin A5 of O4 and pin A2 of N49, through pin A1 of connector G73 (RED GRN)
	B2	CHECK CONTINUITY - Check for continuity of the cables connecting the control unit N49 and the antenna (heated rear windscreen) O3	OK	Carry out step B3
NOT OK		Restore wiring between connector B of N49 and O3 (BLK)
B3		CHECK COAXIAL CABLE - Check for damage of the coaxial cable which connects the radio O4 to the N49 device	OK	Check and if necessary replace the control unit N49 or the radio O4
	NOT OK	Replace coaxial cable

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Parts & tools for this job For 1992 Alfa Romeo 155

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