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ACC / B0193 08

Read the instructions below then start the fault diagnostic procedure.

Symptom: Possible ventilation fan malfunction. Possible AC malfunction.

  B0193 08


Fan blower Circuit, Invalid Signal

Fault symptom

Possible ventilation fan malfunction.

Possible AC malfunction.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ventilation fan activated.

Fault criteria:

No feedback signal from ventilation fan's internal control unit.
Open circuit/short circuit on PWM signal to ventilation fan control.

System reaction to a fault:


A/C function switched off.

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:
Fan Feedback OK
Activation:
Fan PWM Control
(See also description of readings/activations in diagnostic tool)