AHM/PHM / U2103 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Poor cabin heating
Heater does not start.
AHM/PHM has been Missing on Bus
Fault symptom
Poor cabin heating
Heater does not start.
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| AHM/PHM has been Missing on Bus |
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
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.
