Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 145/146 Electrical System Diagnosis Manual, Volume 3 (1994-2001)02 · 146 electrical system diagnosis
02 · Diagnostics

Manual diagnosis (page 3 of 9)

Make
Alfa Romeo
Model
145/146 Electrical System Diagnosis Manual, Volume 3
Year
1994–2001
Section
Anti Theft device
146 electrical system diagnosisManual diagnosis · page 3 of 9
CHECK WARNING LED (D31)TEST B
TEST PROCEDURERESULTCORRECTIVE ACTION
B1CHECK LED
– Disconnect led D31 and check that it is working (applying for example, 5 V at the terminals)		OKCarry out step B2
NOT OKChange the led D31
B2CHECK CONTINUITY
– Check continuity between:
- one of the terminals of led D31 and earth G106
- the other terminal of led D31 and pin A1 of control unit N45		OKChange the control unit N45
NOT OKRestore the wiring between:
- D31 and earth G106
- D31 and pin A1 of N45
CHECK RH FRONT DOOR CONTACT (P10)TEST C
TEST PROCEDURERESULTCORRECTIVE ACTION
C1CHECK DOOR LOCKING DEVICE
– Check that the door locking device is working properly, with regard to the RH front door		OKCarry out step C2
NOT OKFollow the instructions in FAULT-FINDING in the section "DOOR LOCKING SYSTEM"
C2CHECK EARTH
– With the door open, check for 0 V (earth at pin B9 of anti- theft control unit N45		OKChange the control unit N45
NOT OKRestore the wiring between pin B9 of control unit N45 and door lock P10

Parts & tools for this job For 1994 Alfa Romeo 145/146

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