AHM/PHM / B0442 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Poor cabin heating Heater does not start.

B0442 00

Fault symptom

Poor cabin heating

Heater does not start.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.

Glow plug is activated

Heater not in rest mode.

Fault criteria:

Current consumption below 2.4A for 2.5 sec.

System reaction to a fault:

Heater does not start.

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

Electrical fault in connecting leads or component.