U2103 00 - 01

U2103 00

AHM/PHM Has Been Missing on Bus







Fault symptom
- Poor cabin heating
- Heater does not start.

On-board diagnosis

Type of diagnosis:
- Continuous

Enable criteria:
- Ignition ON.
- Heater not in rest mode.

Fault criteria:
- AHM/PHM has been Missing on Bus

System reaction to a fault:
- Heater is switched off.

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.