AHM/PHM / B0457 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Poor cabin heating
Heater does not start.
Control Sensor Circuit, Open
Fault symptom
Poor cabin heating
Heater does not start.
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| Break in the circuit of coolant temperature sensor 1 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) |
