SECTION 06: ELECTRICAL
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version) – Sec 06 revised June 2017
31
Problem/symptom
Probable causes
Actions
Many secondary functions
(not essential for driving)
not functioning (interior
lighting, driver's area
lighting, wiper speed 2
and intermittent).
Marker lights and
clearance lights are
turned on when setting
ignition to the on position.
The mcm does not receive
24 v power.
The can network is not
working. It could be caused
by a short on the network, an
open circuit, a problem with
the mcm or the mcm being
disconnected from the
network.
1. Check / reset circuit breaker cb6 (3
rd
from the left on the junction panel)
check / replace fuse f1
2. Operate in limp-home mode by
starting the vehicle from the engine
compartment (rear start). All functions
essential to drive are available
To close and lock the door, pull the door
manually up to its closed position and it
will lock by itself. The door opening button
is still functioning
Entrance door does not
open nor close using the
control buttons
Defroster fan not
functioning
Windshield wipers not
functioning in speed 1 or
intermittent
Module a47 is not powered
or is faulty
1. Check the
diagnostics
menu of
driver information display (DID).
Select
fault diagnostics
and
electrical system
. The message “no
response moda47, active” indicates a
power problem on the module. (a can
network problem would show the
same message but doesn't produce
these symptoms).
2. Check / reset circuit breaker cb6
3. Check / replace fuse f5
4. Check / replace relay r18
5. Probe gray connector on module to
see if it is powered.
6. Use the air release valves near the
entrance door and in the front service
compartment to lock / unlock the door
Windshield wipers not
functioning in speed 1 or
intermittent
No power on r23
Check / replace fuse f82
HVAC condenser fans not
functioning in speed 1
Circuit breaker cb7 was
manually tripped and not
reset
Check / reset circuit breaker cb7
HVAC condenser fans not
functioning in speed 2
Circuit breaker cb7 was
manually tripped and not
reset
Check / reset circuit breaker cb7
