Page 1
ABC D E F G H I J
1
SA SPN FMI Item Errortext Connector, Pin NOTES
2
49 168 03 System
Voltage
3
49 168 04 System
Voltage
4
49 520201 03 Steering
Wheel
5
49 520201 04 Steering
Wheel
6
49 520203 03 Steering
Wheel
7
49 520203 04 Steering
Wheel
8
Electrical Potential (Voltage) Voltage above normal, or
shorted to high source
Electrical Potential (Voltage) Voltage below normal, or
shorted to low source
Steering wheel switch right Voltage above normal or
shorted to high source
Steering wheel switch right Voltage below normal or
shorted to low source
Steering wheel switch left Voltage above normal or
shorted to high source
Steering wheel switch leftVoltage below normal or
shorted to low source
MSF CAN Fault Codes
conn D, pin 2 Battery overvoltage none 1. The system voltage
conn D, pin 2 Battery undervoltage none 1. The system voltage
conn A, pin 2 DASH_H_PNL_SW_MSF_
MSTR_3A, Pin 3; Fault is
valid also for open circuit
at this pin, can’t be
differentiated
conn A, pin 2 DASH_H_PNL_SW_MSF
MSTR_3A, Pin 3;
conn A, pin 1 DASH_H_PNL_SW_MSF
MSTR_3A, Pin 1; Fault is
valid also for open circuit
at this pin, can’t be
differentiated
conn A, pin 1 DASH_H_PNL_SW_MSF
MSTR_3A, Pin 1;
CUSTOMER
PERCEPTION
SYMPTOM POSSIBLE CAUSES REPAIR ACTION
1. Check the
Right steering
wheel
switches
without
function
Right steering
wheel
switches
without
function
Left steering
wheel
switches
without
function
Left steering
wheel
switches
without
function
is too high
is too low
1. Steeering wheel
switch harness is
shorted to battery or
open
Short circuit to GND Check wiring and
Open load or short
circuit to BAT
Short circuit to GND Check wiring and
system voltage
1. Check the
system voltage
1. Check wiring
harness
connector
Check wiring and
connector
connector
Page 2
ABC D E F G H I J
1
SA SPN FMI Item Errortext Connector, Pin NOTES
2
49 520302 03 Sub bus Subbus signal - Voltage above
normal or shorted to high
source
9
49 520302 04 Sub bus Subbus signal - Voltage below
normal or shorted to low
source
10
49 520404 03 Stalk
Switch
11
49 520405 03 Stalk
Switch
12
49 520415 04 Stalk
Switch
13
Stalk switch flash - Voltage
above normal or shorted to
high source
Stalk switch high beam Voltage above normal or
shorted to high source
Stalk switch wiper common Voltage below normal or
shorted to low source
MSF CAN Fault Codes
conn B, pin 2 DASH_H_PNL_SW_MSF
MSTR_5A to _10A, Pin 2;
conn B, pin 2 DASH_H_PNL_SW_MSF
MSTR_5A to _10A, Pin 2;
conn C, pin 4 DASH_H_PNL_SW_MSF
MSTR_4A, Pin 4;
conn C, pin 5
conn C, pin 6
conn C, pin 7 DASH_H_PNL_SW_MSF
DASH_H_PNL_SW_MSF
MSTR_4A, Pin 5 and Pin
6;
MSTR_4A, Pin 7;
CUSTOMER
PERCEPTION
SYMPTOM POSSIBLE CAUSES REPAIR ACTION
MSF slave
switches
without/
improper
function
MSF slave
switches
without/
improper
function
Low beam,
flash and high
beam out of
function
Stalk switch
high beam
without
function
Stalk switch
out of function
Short circuit to BAT Check wiring and
connector
Short circuit to GND Check wiring and
connector
Short circuit to BAT Check wiring and
connector
Short circuit to BAT Check wiring and
connector
Short circuit to GND Check wiring and
connector
Page 3
ABC D E F G H I J
-
1
SA SPN FMI Item Errortext Connector, Pin NOTES
2
49 520601 04 Headlamp
Switch
14
49 520607 04 Headlamp
Switch
15
49 523530 31 Sub bus Subbus switch missing - none One or more
Headlamp switch +12V Battery
Voltage below normal or
shorted to low source
Backlighting - Voltage below
normal or shorted to low
source
MSF CAN Fault Codes
conn E, pin 1 DASH_H_PNL_SW_MSF
MSTR_2A, Pin 1;
conn A, pin 2
conn E, pin 7
Either backlighting
(terminal 58d) for the
headlight switch >
connector E, pin 7 < or
for the steering wheel
switch > connector A, pin
2 < got a short to GND
CUSTOMER
PERCEPTION
Headlamp
switch without
function (no
Head lights/
Back lighting,
no Fog Lights)
No backlight
function on
the rotary light
switch and
steering wheel
switches
of the subbus
switches are
missing or not
functioning
properly
SYMPTOM POSSIBLE CAUSES REPAIR ACTION
Short circuit to GND Check wiring and
connector
Short circuit to GND Check wiring and
connector
1. Switch not plugged
in or switch electrical
failure
2. Wrong subbus
switch
parameterization
1. Check for
missing or broken
switch
2. Check subbus
switch
parameterization
16
Page 4
ABC D E F G H I J
1
SA SPN FMI Item Errortext Connector, Pin NOTES
2
49 523531 31 Sub bus Extra subbus switch - none none 1. incorrect switch
17
49 523543 02 Headlamp
Switch
18
49 523544 31 Stalk
Switch
19
49 524033 31 SAM Lost communication with
20
49 524037 31 CGW Lost communication with CGW conn D, pin 3
21
Headlamp switch inputs - Data
erratic, intermittent or
incorrect
Stalk switch interrupt conn C, pin 8
SAM_CAB
MSF CAN Fault Codes
conn E, pin 2
conn E, pin 3
conn E, pin 4
conn E, pin 5
conn C, pin 9
conn C, pin 14
conn D, pin 3
conn D, pin 5
conn D, pin 5
DASH_H_PNL_SW_MSF_
MSTR_2A, Pins 2, 3, 5;
RLS signal pattern
different from
(0,0,1;1,0,1;1,1,0)
DASH_H_PNL_SW_MSF
MSTR_4A, Pin 8, Pin 9
and Pin 14;
Monitored SAM Cabin
messages: SAM_CAB_A1
Monitored CGW
messages: CGW_R2
CUSTOMER
PERCEPTION
SYMPTOM POSSIBLE CAUSES REPAIR ACTION
connected to subbus
2. Wrong subbus
switch
parametrization
Headlamp
switch
behaves
erratically
Stalk switch
out of function
(no turn lights,
no wiper, no
flash lights, no
washer)
Backlighting is
internally set
to 100 %
none 1. Cabin CAN data
1. Headlamp switch
connected incorrectly
2. Headlamp switch
wiring harness
shorted to GND,
Battery or open
1. Interrupt of the
stalk switch Signals
56, 56A
1. Cabin CAN data
link compromised
2. ECU is not powered
link compromised
2. ECU is not powered
1. Check subbus
switch
parameterization
2. Unplug all nonparameterized
subbus switches
1. Check
Headlamp Switch
connection
2. Check
Headlamp Switch
wiring harness
1. Check stalk
switch wiring
harness
1. Check Cabin
CAN data link
2. Check ECU
power supply
1. Check Cabin
CAN data link
2. Check ECU
power supply
Page 5
ABC D E F G H I J
1
SA SPN FMI Item Errortext Connector, Pin NOTES
2
49 524071 31 SAM Lost communication with
SAM_CHAS
22
MSF CAN Fault Codes
conn D, pin 3
conn D, pin 5
Monitored SAM Chassis
messages:
SAM_CHAS_A1
CUSTOMER
PERCEPTION
SYMPTOM POSSIBLE CAUSES REPAIR ACTION
Trl_pw (Trailer
power) subbus
switch
function
illumination
switched off
SAM Chassis
electrical hardware
failure or internal
failure.
Check wiring
harness (CAN bus,
SAM Chassis
power supply)
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