BCM / B0473 06

Read the instructions below then start the fault diagnostic procedure.

Symptom: Faulty cabin fan function when parking heater activated.

B0473 06

Fault symptom

Faulty cabin fan function when parking heater activated.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.

Or

Parking heater fan relay activated.

Fault criteria:

When the current on the output is 0A.

System reaction to a fault:

Control module output turned off for 2 seconds.

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:

Parking Heater Fan Relay (MCC)

(See also description of readings/activations in diagnostic tool)