22 · Diagnostics

Ignition switch not working

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Starting › Ignition switch not working

‹ Prev Tilt sensor alarm not working Next › Key cannot be extracted from block

Fault diagnosisIgnition switch not working

IGNITION SWITCH NOT WORKING

When the key is inserted in the ignition the steering is released normally, the instruments light up, the unlocking-locking motor allows the rotation of the key to the starting position, but the starter motor does not work

In the case of a failure of the clutch pedal switch it is possible to use the brake the brake pedal switch for starting (in recovery).

0	BRAKE SWITCH CHECK	All OK	Problems encountered	Operation
		Results of the tests
	Carry out the starting with the brake pedal pressed and the gear lever in Part/Neutral. Check that the switch is working properly. Check that the signal for the gear lever in Park/Neutral reaches the steering lock node correctly.	Move on to Step 2	1. Gear lever not in Park/Neutral	1. Place the lever in Park/Neutral
			2. Brake switch not correctly adjusted	2. Adjust the brake switch
			3. Brake switch defective	3. Replace the switch Op. 5550D10 BRAKE LIGHT SWITCH - R+R
			4. Brake switch wiring short circuited	4. Renew brake switch wiring insulation See E2021 BRAKE LIGHTS
			5. Gear lever Park/Neutral position signal interrupted	5. Restore signal continuity See E7050 AUTOMATIC TRANSMISSION
0	BRAKE SWITCH CHECK	All OK	Problems encountered	Operation
	Carry out the starting with the brake pedal pressed and the gear lever in Part/Neutral. Check that the switch is working properly. Check that the signal for the gear lever in Park/Neutral reaches the steering lock node correctly.	Move on to Step 2	1. Gear lever not in Park/Neutral	1. Place the lever in Park/Neutral
			2. Brake switch not correctly adjusted	2. Adjust the brake switch
			3. Brake switch defective	3. Replace the switch Op. 1060G38 BRAKE PEDAL SWITCH - R.R
			4. Brake switch wiring short circuited	4. Renew brake switch wiring insulation See E2021 BRAKE LIGHTS
			5. Gear lever Park/Neutral position signal interrupted	5. Restore signal continuity
0	BRAKE SWITCH CHECK	All OK	Problems encountered	Operation
	Carry out the starting with the clutch pedal pressed. If the engine does not start, try by pressing the brake pedal	End of diagnosis	The engine only starts with the brake pedal pressed	Move on to Step 1
1	CLUTCH SWITCH CHECK	All OK	Problems encountered	Operation
	Check that the clutch switch is not short circuited Check that the clutch pedal is not pressed for 5 minutes or longer. Check that the clutch switch wiring is not short circuited. Check that the switch is correctly adjusted	Move on to Step 2	1. Clutch switch short circuited/interrupted	1. Replace the switch Op. 1056B78 SWITCH ON CLUTCH PEDAL - R.R (PETROL ENGINES)
			2. Pedal pressed for more than 5 minutes	2. Remove your foot from the clutch pedal
			3. switch wiring short circuited/interrupted	3. Restore wiring See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
			4. Switch not correctly adjusted	4. Adjust switch
1	CLUTCH SWITCH CHECK	All OK	Problems encountered	Operation
	Check that the clutch switch is not short circuited Check that the clutch pedal is not pressed for 5 minutes or longer. Check that the clutch switch wiring is not short circuited. Check that the switch is correctly adjusted	Move on to Step 2	1. Clutch switch short circuited/interrupted	1. Replace the switch Op. 1060G42 SWITCH ON CLUTCH PEDAL - R.R. (JTD ENGINES)
			2. Pedal pressed for more than 5 minutes	2. Remove your foot from the clutch pedal
			3. switch wiring short circuited/interrupted	3. Restore wiring See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
			4. Switch not correctly adjusted	4. Adjust switch
2	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment to the diagnostic socket and check: that there are no errors in the TEG-Reader node; that there are no errors at the B-Can that there are no errors at the NBS node parameter plausibility	Move on to Step 5	1. Errors detected at the Teg-Reader node	1. Move on to Step 3
			2. Errors at the B-Can	2. Continue following the instructions for the diagnostic equipment
			3. Errors at the NBS node	3. Move on to Step 4
			4. Parameters not plausible	4. Restore parameter plausibility
3	TEG-READER CHECK	All OK	Problems encountered	Operation
	Check: that the wiring is correctly connected to the TEG-READER that the connection between the TEG-Reader and the steering lock is correct that the power supply is correct See Test 5520AA CHECK ON IGNITION SWITCH EFFICIENCY	Move on to Step 5	1. Wiring interrupted/short circuited	1. Restore the correct wiring
			2. Supply not correct	2. Restore correct power supply.
			3. TEG-READER defective	Replace the ignition Op. 5520A14 IGNITION KEY LOCK BARREL - R+R
4	STEERING LOCK NODE CHECK	All OK	Problems encountered	Operation
	Check: continuity of wiring at the steering lock node that the power supply is correct correct starting signal output See Test 5580ED ELECTRIC STEERING LOCK CHECK	Move on to Step 5	1. Connectors / wiring defective	1. Restore correct wiring connectors.
			2. Power supply at steering lock not correct	2. Restore correct power supply at steering lock.
			3. Steering lock defective.	3. Replace the steering lock node Op. 5580E17 STEERING LOCK - R.R
5	STARTING SIGNAL CHECK	All OK	Problems encountered	Operation
	With the key turned to the AVV position and the clutch pedal pressed, check that the voltage at the starter motor solenoid is +50 V See E7065 ELECTRIC STEERING LOCK	Move on to Step 6	1. Starting signal wiring interrupted from the steering lock node to the battery control unit	1. Restore wiring See E7065 ELECTRIC STEERING LOCK
			2. Wiring from battery control unit to starter motor	2. Restore wiring See E7065 ELECTRIC STEERING LOCK
			3. Starter motor defective	3. Replace the starter motor Op. 5520B10 STARTER MOTOR - R+R
5	STARTING SIGNAL CHECK	All OK	Problems encountered	Operation
	With the key turned to the AVV position and the clutch pedal pressed, check that the voltage at the starter motor solenoid is +50 V See E7065 ELECTRIC STEERING LOCK	Move on to Step 6	1. Starting signal wiring interrupted from the steering lock node to the battery control unit	1. Restore wiring See E7065 ELECTRIC STEERING LOCK
			2. Wiring from battery control unit to starter motor	2. Restore wiring See E7065 ELECTRIC STEERING LOCK
			3. Starter motor relay defective	3. Replace the relay
			4. Starter motor defective	4. Replace the starter motor Op. 5520B10 STARTER MOTOR - R+R
6	BODY COMPUTER CHECK	All OK	Problems encountered	Operation
	Check that the body computer is working properly	End of diagnosis	Body Computer defective	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.

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Parts & tools for this job For 2005 Fiat Croma

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