Diagnosis with flashing codes
- Make
- Alfa Romeo
- Model
- 145/146 Electrical System Diagnosis Manual, Volume 3
- Year
- 1994–2001
- Section
- Airbag › Diagnosis with flashing codes
DIAGNOSIS WITH FLASHING CODES
(only with BECKER control unit)
As an alternative to the ALFA TESTER it is possible to diagnose the system by reading the number of flashes of the Air Bag warning light.
N.B. Before carrying out diagnosis using the flashing code, carry out the preliminary test described later (TEST A).
To perform diagnosis, with the ignition key engaged, earth pin 3 of the electronic control unit for between 1 and 5 seconds (pin 3 of the control unit connects the Air Bag failure warning light and pin 1 of connector T3).
Once the fault has been repaired, the test must be repeated to check that other faults are not present. Remember that the control unit signals one fault at a time, in decreasing order, until the system has been repaired completely. When the repairs have been completed, the FAULT MEMORY is cancelled by earthing pin 3 of the control unit for between 5 and 10 seconds. All the errors stored must be cancelled one by one, repeating the procedure each time, until the FAULT-MEMORY has been cancelled completely.
The following table shows the possible faults and the remedies to be adopted, according to the number of flashes of the warning light.
| NO. OF FLASHES | POSSIBLE FAULT | REMEDIES |
|---|---|---|
| 1 | No faults detected | - |
| 2 | Faulty control unit | Change the control unit R22 |
| 3 | Module triggering circuit in contact with +12V | Check the wiring |
| 4 | Module triggering circuit in contact with earth | Check the wiring |
| 5 | Driver's side module triggering device resistance out of tolerance | Check the wiring or change the driver's side module R23 |
| 6 | Passenger's side module triggering device resistance out of tolerance | Check the wiring or change the passenger's module R27 |
| 7 | Supply voltage below 9.5 V | Check fuse F15 of fusebox G1 or recharge or change the battery A1 |
| 8 | Warning light circuit fault | Check the wiring or change the instrument cluster C10 |
NOTE: Diagnosis with the blink code is NOT possible with the TRW control unit.
Parts & tools for this job For 1994 Alfa Romeo 145/146
- TOOLOBD2 scanner with SRSSearch: OBD2 scanner ABS SRS
- TOOLTrim removal tool kitSearch: trim removal tool kit
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