Group 87 Climate Control, Fault Codes
Troubleshooting
MID 146 SID 232 5 Volt Supply Sensors
T8009497
Component: A34 Climate Control Unit, E32 Climate
Unit
General information
Fault code
FMI 4
Abnormally low voltage or short-circuit to lower voltage
Conditions for fault code:
•
If the control unit detects a short-circuit to ground, the
control unit interprets this as an error and a fault code
is stored.
Possible cause:
•
Signal cable short-circuited to higher voltage
•
Ground lead short-circuited to higher voltage
Reaction from the control unit:
•
Fault code is stored
•
Yellow lamp requested
Noticeable external symptoms:
•
Yellow lamp lights up
•
No air conditioning (A/C) function
•
Only temperature control in the extreme positions;
maximum heat or maximum cooling
Appropriate check:
•
See “MID 146 SID 232 5 Volt Supply Sensors, Check”
page 41
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