23 · Diagnostics

Parking brake failure warning light on

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Instrument panel › Parking brake failure warning light on

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Fault diagnosisParking brake failure warning light on

PARKING BRAKE FAILURE WARNING LIGHT ON

The handbrake/brake fluid warning light remains on with the handbrake released

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Check that the ABS warning light comes on and goes out during the initial test Connect the diagnostic equipment and check the following at the CAN INFORMATION: - No control units inactive - No faulty control units - No control units with faulty CAN line	Move on to Step 5	The ABS warning light also remains on	Proceed as instructed in the See table K062 ABS AND HANDBRAKE WARNING LIGHTS BOTH ON
			Fault on CAN network	Continue following the instructions for the diagnostic equipment
			Communication impossible with the Body Computer	Move on to Step 2
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the diagnostic equipment connected, check the plausibility of the brake fluid level parameter at the Body Computer Node	Move on to Step 4	The parameter is not plausible	Replace body computer Op. 5505A32 BODY COMPUTER - R.R
		Move on to Step 4	Impossible to connect to the Body Computer control unit.	Move on to Step 2
2	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the electricity supply to the Body Computer Node is correct	Move on to Step 3	Fault in positive electrical supply and/or earth	Replace the defective component (in the case of a fuse, find out what caused it to blow)
3	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Using the diagnostic equipment, check the possibility of connection to the Body Computer Node	Move on to Step 1	Impossible to connect to the Body Computer control unit.	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R
4	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Move on to Step 5
5	BRAKE FLUID LEVEL CHECK	All OK	Problems encountered	Operation
	Check that the brake fluid level is not low	Move on to Step 9	Insufficient brake fluid level	Move on to Step 6
6	BRAKE FLUID LEVEL TOP UP	All OK	Problems encountered	Operation
	Top up the brake fluid level and check that the warning light goes out	End of diagnosis	The warning light does not go out	Move on to Step 7
7	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the diagnostic equipment connected, check that there are no CAN faults at the BRAKE NODE	Move on to Step 8	Fault on C-CAN network	Move on to Step 14
8	ELECTRICAL SYSTEM CHECK	All OK	Problems encountered	Operation
	Disconnect the connector from the oil level sensor and check that it is working properly See Test 3330AA Checking the low brake fluid sensor sensor	Move on to Step 9	Brake fluid level sensor defective	Replace the sensor
8	ELECTRICAL SYSTEM CHECK	All OK	Problems encountered	Operation
	Disconnect the connector from the oil level sensor and check that it is working properly See Test 3330AA Checking the low brake fluid sensor sensor	Move on to Step 9	Brake fluid level sensor defective	Replace the sensor
9	ELECTRICAL SYSTEM CHECK	All OK	Problems encountered	Operation
	Check the continuity of the cable from the connector to the Body Computer See E4010 INSTRUMENT PANEL	Move on to Step 10	Lead broken	Repair the connection See E4010 INSTRUMENT PANEL
10	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and check the plausibility of the handbrake applied parameter at the Body Computer Node	Move on to Step 11	The parameter is not plausible	Move on to Step 15
11	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment or keep it connected and check the operation of the brake fluid level warning light in active diagnosis at the Instrument Panel Node	Move on to Step 12	The warning light does not flash	Replace instrument panel Op. 5560B10 CONTROL PANEL - R+R
12	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the electricity supply to the Instrument Panel Node is correct	Move on to Step 13	Fault in positive electrical supply and/or earth	Replace the defective component (in the case of a fuse, find out what caused it to blow)
13	CHECK ELECTRICAL CONNECTIONS	All OK	Problems encountered	Operation
	Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected	Move on to Step 14	Electrical connections not operational	Renew the damaged electrical connections
14	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the diagnostic equipment connected, check the plausibility of the brake fluid level parameter at the Body Computer Node	Move on to Step 15	The parameter is not plausible	Replace body computer Op. 5505A32 BODY COMPUTER - R.R
15	ELECTRICAL SYSTEM CHECK	All OK	Problems encountered	Operation
	Check the insulation to earth of the wiring between the Handbrake lever switch and the Body Computer	Move on to Step 16	Wiring not insulated	Restore wiring See E4010 INSTRUMENT PANEL
16	SWITCH CHECK	All OK	Problems encountered	Operation
	Check the condition of the switch on the handbrake lever	Move on to Step 17	Switch defective	Replace the switch Op. 5550D18 HANDBRAKE ON WARNING LIGHT SWITCH - R+R
17	ACTIVE DIAGNOSIS CHECK	All OK	Problems encountered	Operation
	With the Examiner in the Instrument Panel Node ambient check that the handbrake warning light is correctly activated in Active Diagnosis.	Move on to Step 19	The handbrake warning light does not flash	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
		Move on to Step 19	Impossible to connect with the Instrument Panel Node	Move on to Step 18
18	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present	Move on to Step 19	Presence of errors	Continue following the instructions on the diagnostic instrument
19	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Using the Examiner check, in the Body Computer ambient, that there are no errors and that the parameter specified varies	Move on to Step 10	Presence of errors	Continue by following the instructions on the diagnostic instrument
		Move on to Step 10	The parameters do not change	Move on to Step 10
20	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R

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