AHM/PHM / B0448 02
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Poor cabin heating
Heater does not start.
Blower Fan Circuit, Short to Ground
Fault symptom
Poor cabin heating
Heater does not start.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Combustion air fan active |
Fault criteria:
| Combustion air fan, shorted to ground for more than 2.5 s. |
System reaction to a fault:
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:
| (See also description of readings/activations in diagnostic tool) |
