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Diagnostic Manual, Info./Comm., Volume 1

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LOCATION:    12.1 Signaling Device (SD) - Horn   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test scope Test connection Test condition Nominal value Possible cause/Remedy
1.0 Fanfare horns H2

3
horn relay socket
K40/2

5
horn relay socket
Remove horn relay (K40/2k6)
Bridge as shown, see Figure 1
Fanfare horns sound



2.0 ,
Values OK:
3.0 ,
2.0 Driver-side fuse and relay module box K40/2
Voltage supply for horn relay K40/2k6


K40/2
3
horn relay socket
Remove horn relay (K40/2k6)
Connect as shown, see Figure 1

11 - 14 V


2.1 ,
f4, f5
Values OK:
Wiring
H2
2.1 Driver-side fuse and relay module box K40/2
Voltage supply circuit 30

4
(C1.4)

4
(C1.4)
K40/2





2
(C1.2)

3
(C1.3)
Ignition: OFF
11 - 14 V





Wiring,
Values OK:
K40/2
3.0 Signal pickup and activation module (SAM) left front N10/1
respectively
Driver-side fuse and relay module box K40/2
circuit 15R for horn relay K40/2k6



K40/2
2
horn relay socket
Remove horn relay (K40/2k6)
Connect as shown, see Figure 1
Ignition switch in position 1

11 - 14 V



3.1 ,
Values OK:
3.2 ,
3.1 circuit 15R

K40/2
2
(C1.1)
Ignition switch in position 1
11 - 14 V

Wiring
Values OK:
K40/2
N10/1
3.2 Horn relay K40/2k6 control (coil)
1
horn relay socket
K40/2

2
horn relay socket
Remove horn relay (K40/2k6)
Connect as shown, see Figure 1
Ignition switch in position 1
Horn switch (S4/2):
depressed
not depressed






11 - 14 V
< 1 V
Wiring
S4/2
CAN between N73 and N10/1
N10/1
N73
Values OK:
K40/2k6
4.0 Horn switch S4/2 and wiring
3
(B.3)
(Ground)
N73

8
(B.8)
Remove connector B on N73
Horn switch (S4/2):
depressed
not depressed



< 1
> 20 k
Wiring
A45
S4/2
5.0 Electronic ignition lock control module N73
Voltage supply, circuit 30

3
(B.3)

3
(B.3)

3
(B.3)
N73






4
(A.4)

5
(A.5)

7
(B.7)
Ignition: OFF
Loosen connectors A and B on N73

11 - 14 V



Wiring
6.0 Horn relay K40/2k6
 

 

 

 

 

Remove horn relay (K40/2k6) Horn sounds


Wiring
or in K40/2
Values OK and
Complaint present with ignition OFF:
K40/2k6
Values OK and
Complaint present with ignition ON:
4
CAN
K40/2
N10/1
N73
7.0 HHT interface, connection between N73 and diagnostic connector X11/4 X11/4
20

N73
14
(B.14)
Ignition: OFF
< 1
Wiring
8.0 CAN Data line between N10/1 and N73
N73
11
(B.11)

10
(B.10)




N10/1
7
(2.7)

6
(2.6)
Remove connector B on N73 and connector 2 on N10/1
< 1


< 1
Wiring
8.1
8.1
6
(2.6)
N10/1

7
(2.7)
Remove connector 2 on N10/1
> 20 k
Wiring
8.2
8.2 CAN Data line High

1
(4.1)
N10/1

6
(2.6)
Remove connectors 2 and 4 on N10/1
> 20 k
Wiring
8.3
8.3 CAN Data line Low

1
(4.1)
N10/1

7
(2.7)
Remove connectors 2 and 4 on N10/1
> 20 k
Wiring
8.4
8.4 CAN Data line High

2
(4.2)
N10/1

6
(2.6)
Remove connectors 2 and 4 on N10/1
> 20 k
Wiring
8.5
8.5 CAN Data line Low

2
(4.2)
N10/1

7
(2.7)
Remove connectors 2 and 4 on N10/1
> 20 k
Wiring