23 · Diagnostics

Abs and handbrake warning lights both on

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Instrument panel › Abs and handbrake warning lights both on

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Fault diagnosisAbs and handbrake warning lights both on

ABS AND HANDBRAKE WARNING LIGHTS BOTH ON

The handbrake lever is released

The handbrake warning light also indicates a low brake fluid level and, if it is on at the same time as the ABS warning light, a malfunction of the EBD system. The command to switchon the handbrake warning light is sent by the switch on the lever to the Body Computer Node which makes it available on the B-CAN to the Instrument Panel Node.

1	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the EXAMINER diagnostic equipment and check the following at the CAN INFORMATION: No faulty control units No control units with faulty CAN	Move on to Step 2	1. Fault on CAN network	1. Continue following the instructions for the diagnostic equipment
		Move on to Step 2	2. Impossible to converse with the Body Computer	2. Move on to Step 8
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic equipment connected, check that there are no CAN faults at the BRAKE NODE	Move on to Step 2	Fault on C-CAN	Move on to Step 8
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and that the parameters are present.	Move on to Step 4	Presence of errors	Continue following the diagnostic equipment information
4	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the electrical power supply for the Instrument Panel Node is correct	Move on to Step 5	Electric power supply positive and/or earth faulty	Replace defective component (in the case of a fuse, find out what caused it to blow).
5	ELECTRICAL CONNECTIONS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electrical connections betwen the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected.	Move on to Step 6	Electrical connections not working.	Renew the damaged electrical connections.
6	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in the Instrument Panel Node ambient check that the warning lights are correctly activated in Active Diagnosis.	Move on to Step 7	The warning lights are not flashing	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
7	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner in the Body Computer Node ambient, check that the following errors are not present	Move on to Step 10	1. Impossible to connect to the Body Computer control unit.	1. Move on to Step 8
		Move on to Step 10	2. Presence of errors	2. Continue following the diagnostic equipment instructions
8	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the electrical power supply for the Body Computer Node is correct	Move on to Step 9	Electric power supply positive and/or earth faulty	Replace defective component (in the case of a fuse, find out what caused it to blow).
9	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner, check whether it is possible to connect to the Body Computer Node.	Move on to Step 10	Impossible to connect to the Body Computer control unit.	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R
10	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2005 Alfa Romeo 159

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