Models: ALL 164 MODELS [ USA 91-93 only]
Date: 5/24/90
When diagnosing a flashing AIRBAG warning light, use the following guidelines:
NOTE: USE TESTER IF AVAILABLE - SEE PAGE 42 OF THIS BOOK.
TO EXTRACT FAULT CODES FROM THE MEMORY
1. Locate the airbag test connector (4 wires) under the right end of
the dashboard. (See Fig. 1)
2. Connect a jumper wire between the blue/black and black wires.
3. Turn on the ignition key.
4. Observe the AIRBAG warning light; it will flash once, followed by
a short pause, then flash twice. This represents code 12, which is an indication
that the troubleshooting procedure is "running". Code 12 will be repeated
3 times.
(Example: 12-12-12)
5. If fault codes are stored, they will follow the code 12 sequence and the AIRBAG warning light will flash a 2-digit fault code 3 times for each fault indication stored in the memory. (Example: 26-26-26)
6. When the fault memory is empty, the AIRBAG warning light will again
flash code 12-12-12 to indicate that all of the stored fault codes have
been displayed.
TO CLEAR FAULT CODES AFTER REPAIR:
1. Carry out the procedure outlined above to view all stored fault codes.
2. When the fault memory is empty, and the AIRBAG warning light is flashing l2-l2-12 again (indicating "end of codes"), disconnect the jumper wire at the test connector for 3 seconds.
3. Re-connect the jumper wire at the test connector for 3 seconds.
4. Remove the jumper wire from the test connector, and quickly turn of f the ignition key.
5. Wait 10 seconds, then turn on the ignition key to allow the airbag ECU to test the system. If there are no faults present, the AIRBAG warning light will come on with the key, then go off after 5-8 seconds, and remain off. If there are still faults present in the system, the AIRBAG warning light will come on with the key, go of f after 5-8 seconds, then begin flashing again. If the AIRBAG warning light begins to flash immediately after turning on the ignition key, the previous fault codes HAVE NOT BEEN CLEARED.
6 If the AIRBAG warning light flashes again indicating that there are
one or more faults present in the system, extract the fault code(s), repair
the fault(s), and clear the fault memory again.
YOU ARE REMINDED THAT ALL AIRBAG DIAGNOSTIC PROCEDURES OUTLINED IN THIS BULLETIN AND IN THE WORKSHOP MANUALS SHOULD BE FOLLOWED EXACTLY AS STATED TO PREVENT THE POSSIBILITY OF ACCIDENTAL AIRBAG DEPLOYMENT.
Sincerely,
ALFA ROMEO DISTRIBUTORS OF NORTH AMERICA
Technical Services Department
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