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Fiat 500 Factory Service Manual (2007-2024)22 · Fault diagnosis
22 · Diagnostics

Abs and handbrake warning lights both on

Make
Fiat
Model
500 Factory Service Manual
Year
2007–2024
Section
Instrument panel › Abs and handbrake warning lights both on
Fault diagnosisAbs and handbrake warning lights both on

ABS AND HANDBRAKE WARNING LIGHTS BOTH ON

1.2 8v, 1.3 Multijet, 1.4 16v

With the ignition on, the ABS warning light and the handbrake warning light come on simultaneously and stay on for longer than 3 seconds (both warning lights should go off after the initial control unit test)

If it comes on at the same time as the ABS warning light, the low brake fluid level and handbrake warning light also indicates an EBD fault.

Warning: Under these circumstances, the rear wheels may lock and the vehicle may skid if the brakes are operated because the system EBD function is temporarily deactivated. If it comes on alone, this means that the handbrake is on or the brake fluid level is too low

Test results
1WARNING LIGHTS ACTIVATION CHECKAll OKProblems encounteredOperation
Connect the Examiner to the Instrument Panel Node and check that the ABS and handbrake warning lights are correctly activated in active diagnosisMove on to Step 2The warning lights do not flash.

Replace the instrument panel

Op. 5560B10 CONTROL PANEL - R+R

2CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Connect an Examiner to the ABS control unit

Check that there are no faults

Move on to Step 3

1. Error detected in the control unit

1. No communication with the control unit

1. Continue following the instructions on the diagnostic equipment

2. Move on to Step 3

3CORRECT POWER SUPPLY CHECKAll OKProblems encounteredOperation

Check that the ABS control unit is receiving the correct power supply

See E7020 ABS

Check that the connector for the ABS control unit is correctly fitted

End of diagnosis

1. Control unit power supply interrupted

2. ABS control unit defective

1. Restore correct power supply

2. Replace ABS control unit

Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.

Parts & tools for this job For 2007 Fiat 500

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