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AHM/PHM / U2103 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Poor cabin heating Heater does not start.

  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

Communication must be OK to read out DTCs from the control module. If the DTC is stored and read out with the diagnostic tool, it is a sign that the problem was an intermittent bus lead/power supply or ground lead fault.