AHM/PHM / B1001 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Poor cabin heating
Heater does not start.
Control Module. Internal Fault
Fault symptom
Poor cabin heating
Heater does not start.
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| Control module on-board diagnostics has detected an internal fault. |
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
See "Before changing a control module" and "After fitting a control module" under Fault diagnosis, general.
