Contents

To apply this procedure, the following must be borne in mind:

1 - Measurements cannot be taken on the Air Bag wiring

2 - System fault diagnosis should be started leaving the vehicle loads connected

3 - The fault should be 'Present' or 'Present Intermittently' and not 'Intermittent'. If the fault is Intermittent then the procedure is not applicable; proceed with an accurate check on the line where the fault was signalled

4 - Not all the simulation sensors are available (e.g. side impact sensors).

The airbag fault warning light is controlled by a dedicated connection to the airbag control unit Instrument Panel Node.

The Air Bag wiring is a safety component. If there are problems with the cables or the connectors then the wiring should be replaced in its entirety.

		Test results
1	ELECTRICAL CONNECTION CHECK	All OK	Problems encountered	Operation
	Turn the ignition key to the STOP position. Check that the connector is correctly connected to the control unit and there are no faulty connections in the intermediate joint	Go to Step 2	One or more connectors are not correctly connected	Reconnect the connector correctly.
2	ELECTRICAL CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check the electrical circuit	Go to Step 3	1. S.C. resistance too low 2. O.C. resistance too high	1. Restore correct operation 2. Restore correct operation
3	ELECTRICAL CONNECTION CHECK	All OK	Problems encountered	Operation
	Check the electrical circuit for short circuits to Vbatt. and earth.	Go to Step 4	1. Short circuit to Vbatt. 2. Short circuit to earth	1. Restore insulation to + battery 2. Restore insulation to earth
4	CLOCK SPRING CONTACT CHECK	All OK	Problems encountered	Operation
	Disconnect the air bag wiring clock spring contact and connect a dummy resistance in its place. Turn the ignition key to MAR and activate communication with the diagnostic equipment. Check whether the fault in the driver's side front airbag has become intermittent	Go to Step 5	The fault is still present	Turn the ignition key to the STOP position. Replace the dashboard wiring Op. 5505C30 BUILT-IN WIRING UNDER DASHBOARD - R.R. WITH DASHBOARD TRIM REMOVED
5	DRIVER'S AIR BAG CHECK	All OK	Problems encountered	Operation
	Turn the ignition key to the STOP position. Reconnect the clock spring contact to the airbag wiring. Disconnect the load from the steering wheel and connect the dummy resistance in its place. Turn the ignition key to MAR and activate the dialogue. Check whether the fault in the driver's front airbag is still intermittent	Go to Step 6	The fault has become Present	Turn the ignition key to the STOP position. Replace the clock spring Op. 5550A10 STALK UNIT ASSEMBLY - R+R
6	REPLACING THE DRIVER'S AIRBAG	All OK	Problems encountered	Operation
	Turn the ignition key to the STOP position. Replace the explosive charge on the steering wheel Op. 5580C18 AIR BAG MODULE - R+R Delete the errors using the diagnostic equipment	Go to Step 7
7	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the diagnostic equipment is not signalling other faults	End of diagnosis	The diagnostic equipment is signalling other faults	Proceed as instructed See table K080 AIR BAG FAILURE WARNING LIGHT ON