22 · Diagnostics

Abs and handbrake warning lights both on

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Instrument panel › Abs and handbrake warning lights both on

‹ Prev Abs warning light off (intial test not carried out)Next › Handbrake warning light does not come on (with handbrake applied)

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 an EXAMINER and check the following on CAN NETWORK INFORMATION: No faulty control units No control units with faulty CAN line	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. Communication impossible 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 network	Move on to Step 8
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner diagnostic equipment check, in Instrument Panel mode, that there are no errors and that the parameters are present.	Move on to Step 4	Presence of errors	Continue following the instructions on the diagnostic instrument
4	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electricity supply to the Instrument Panel Node is correct.	Move on to Step 5	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow).
5	CHECK ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electrical connections between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected.	Move on to Step 6	Electrical connections not operational	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 do not flash	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
7	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using an Examiner check, in Body Computer Node mode, that there are no errors.	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 by following the instructions on the diagnostic instrument
8	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electricity supply to the Body Computer Node is correct.	Move on to Step 9	Fault in positive electrical supply and/or earth	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
	Use an Examiner to check the possibility of connection to the Body Computer Node	Move on to Step 10	Impossible to connect to the Body Computer control unit.	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.
10	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis

‹ Prev Abs warning light off (intial test not carried out)Next › Handbrake warning light does not come on (with handbrake applied)

Parts & tools for this job For 2005 Fiat Croma

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