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Volume 3

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LOCATION:    10.4 Electronic Stability Program(ESP)   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test scope
Test connection
Test condition Nominal value Possible cause/Remedy
1.0
ESP control
module (N47-5)
Circuit 30
Voltage supply from fuse and relay box (F1)


57 (2.23)


57 (2.23)
N47-5





58
(2.24)


82
(2.48)
Ignition: OFF


With DTC (excessive voltage) repeat the test with engine running.


11 - 14 V

11 - 14 V
Values < 11 V:
Wiring,
fuse f27 in F1 (fuse and relay box).
Values >14 V:
check generator (G1).
1.1   Voltage supply for circuit 15 from fuse and relay box (F1).


57
(2.23)


81
(2.47)
N47-5





14
(1.14)


14
(1.14)
Ignition: ON

11 - 14 V

11 - 14 V
Wiring,
Fuse f22 in F1 (fuse and relay box).

2.0   Diagnostic output
(ESP control module) (N47-5)


57
(2.23)
N47-5



13
(1.13)
Ignition: ON 10 - 14 V


Wiring,
ESP control module (N47-5).
3.0 High-pressure/return
pump (F1k25)
Voltage supply for circuit 30 from F1 (fuse and relay box)

F1k25

3
Ignition: OFF
Fuse F1k25 removed



11 - 14 V
F1 (fuse and relay box)
3.1  

Coil resistance


46
(2.12)
N47-5





47
(2.13)
Ignition: OFF
Disconnect ESP control module (N47-5).
Fuse f1k25 connected.
40 - 80 Wiring,
F1k25,
F1 (fuse and relay box).
3.2   Control circuit voltage supply of F1k25 relay from N47-5



57
(2.23)
N47-5





47
(2.13)
Connect ESP control module (N47-5).
Ignition: ON


11 - 14
ESP control module (N47-5).
4.0
Steering angle
sensor (N49)
Voltage supply circuit 30 from F1 (fuse and relay box)

2

N49

1
Ignition: OFF
Disconnect connector from N49

11 - 14 V
Fuse f13 at F1
Wiring,
F1
4.1
 
Voltage supply circuit 15 from F1 (fuse and relay box)

2

N49

3
Ignition: ON
11 - 14 V
Fuse f22 at F1
Wiring,
F1
5.0 ESP stop lamp supression (F1k6) relay
Voltage supply circuit 30, from fuse and relay box (F1) for control circuit of F1k6

F1k6

1
Ignition: OFF
Measurement to be taken at socket for F1k6,
F1k6 removed.

11 - 14 V

Fuse and relay box (F1).
5.1   Signal from stop lamp switch (S9/1) (N.C.)

F1k6

3
Ignition: ON
F1k6 removed,
press service brake.

11 - 14 V

Wiring,
Stop lamp switch (S9/1)
5.2   Signal from stop lamp switch (S9/1) (N.O.)


57
(2.23)
N47-5



11
(1.11)
Ignition: ON
F1k6 connected,
service brake not pressed

service brake pressed


11 - 14 V

< 9 V
Wiring,
Stop lamp switch (S9/1)
5.3   Signal from F1k6 for activation of the stop lamps



57
(2.23)
N47-5



15
(1.15)
Ignition: ON
F1k6 connected,
Press service brake.


11 - 14 V

Wiring,
F1k6,
ESP control module (N47-5)
6.0


Stop lamp switch (S9/1)
Closed (N.C.)


 


 
Service brake:
Not pressed:
Pressed:


Wiring,
S9/1,
ESP stop lamp supression relay (F1k6),
ESP control module (N47-5).
6.1   Open (N.O.)


 


 
Service brake:
Not pressed:
Pressed:


Wiring,
S9/1
7.0   Parking brake switch (S12)


 


 
Engine: at idle
Press parking brake pedal:



Parking brake pedal not pressed:

Parking brake warning lamp (A1e7): ON


(A1e7): OFF
Wiring,
S12,
A1e7
8.0   ESP OFF switch (S76/6)


 


 
S76/6 in position: ON
Held pressed:

At rest:

S76/6 in position: OFF
Held pressed:



>


<
Wiring,
S76/6,
ESP control module (N47-5)
9.0

Left front axle VSS
sensor (L6/1)
Internal resistance

77
(2.43)
N47-5


78
(2.44)
Ignition: OFF
Disconnect ESPcontrol module (N47-5).


0.8 - 2.3 k
Wiring
L6/1
9.1  

Insulation resistance


57
(2.23)
N47-5



77
(2.43)
Ignition: OFF
Disconnect (N47-5)



> 20 k
Wiring,
L6/1
10.0
Right front axle VSS
sensor (L6/2)
Internal resistance


52
(2.18)
N47-5



51
(2.17)
Ignition: OFF
Disconnect (N47-5)


0.8 - 2.3 k
Wiring,
L6/2
10.1  

Insulation resistance


57
(2.23)
N47-5



52
(2.18)
Ignition: OFF
Disconnect (N47-5)



> 20 k
Wiring,
L6/2
11.0
Left rear axle VSS
sensor (L6/3)
Internal resistance


26
(1.26)
N47-5



25
(1.25)
Ignition: OFF
Disconnect (N47-5)


0.6 - 1.8 k
Wiring,
L6/3
11.1  

Insulation resistance


57
(2.23)
N47-5



26
(1.26)
Ignition: OFF
Disconnect (N47-5)



> 20 k
Wiring,
L6/3
12.0
Right rear axle VSS
sensor (L6/4)
Internal resistance


28
(1.28)
N47-5



27
(1.27)
Ignition: OFF
Disconnect ESP control module (N47-5).


0.6 - 1.8 k
Wiring,
L6/4
12.1  

Insulation resistance


57
(2.23)
N47-5



28
(1.28)
Ignition: OFF
Disconnect (N47-5).


> 20 k
Wiring,
L6/4
13.0

ASR/ETS/ESP hydraulic
unit (A7/3) (Traction systems)
Solenoid valve voltage supply from N47-5


57
(2.23)
N47-5



80
(2.46)
Ignition: OFF

11 - 14 V
Wiring,
ESP control module (N47-5).
14.0 Left front axle solenoid valve (hold) (A7/3y6)
Internal resistance


80
(2.46)
N47-5



73
(2.39)
Ignition: OFF
Disconnect (N47-5).


5.4 - 12.6
Wiring,
A7/3
15.0 ASR/ETS hydraulic unit, left front axle solenoid valve (release) (A7/3y7)
Internal resistance


80
(2.46)
N47-5



72
(2.38)
Ignition: OFF
Disconnect (N47-5).


2.8 - 6.6
Wiring,
A7/3
16.0 Right front axle solenoid valve (hold) (A7/3y8)
Internal resistance


80
(2.46)
N47-5



74
(2.40)
Ignition: OFF
Disconnect (N47-5).


5.4 - 12.6
Wiring,
A7/3
17.0 Right front axle solenoid valve (release) (A7/3y9)
Internal resistance


80
(2.46)
N47-5



71
(2.37)
Ignition: OFF
Disconnect (N47-5).


2.8 - 6.6
Wiring,
A7/3
18.0 Left rear axle solenoid valve (hold) (A7/3y10)
Internal resistance


80
(2.46)
N47-5



69
(2.35)
Ignition: OFF
Disconnect (N47-5).


5.4 - 12.6
Wiring,
A7/3
19.0 Left rear axle solenoid valve (release) (A7/3y11)
Internal resistance


80
(2.46)
N47-5



70
(2.36)
Ignition: OFF
Disconnect (N47-5).


2.8 - 6.6
Wiring,
A7/3
20.0 Right rear axle solenoid valve (hold) (A7/3y12)
Internal resistance


80
(2.46)
N47-5



64
(2.30)
Ignition: OFF
Disconnect (N47-5).


5.4 - 12.6
Wiring,
A7/3
21.0 Right rear axle solenoid valve (release) (A7/3y13)
Internal resistance

80
(2.46)
N47-5


65
(2.31)
Ignition: OFF
Disconnect (N47-5).

2.8 - 6.6
Wiring,
A7/3
22.0 Pressure circuit 1 vacuum solenoid valve (A7/3y26)
Internal resistance


80
(2.46)
N47-5




61
(2.27)
Ignition: OFF
Disconnect (N47-5).


2.8 - 6.6
Wiring,
A7/3
23.0 Pressure circuit 2 vacuum solenoid valve (A7/3y27)
Internal resistance


80
(2.46)
N47-5




63
(2.29)
Ignition: OFF
Disconnect (N47-5).


2.8 - 6.6
Wiring,
A7/3
24.0 Pressure circuit 1 switchover solenoid
valve (A7/3y24)
Internal resistance


80
(2.46)
N47-5




60
(2.26)
Ignition: OFF
Disconnect (N47-5).


5.4 - 12.6
Wiring,
A7/3
25.0 Pressure circuit 2 switchover solenoid
valve (A7/3y25)
Internal resistance


80
(2.46)
N47-5




62
(2.28)
Ignition: OFF
Disconnect (N47-5).


5.4 - 12.6
Wiring,
A7/3
26.0 ABS lateral acceleration sensor (B43)
Supply voltage from N47-5

24
(1.24)
N47-5


22
(1.22)
Ignition: ON
4.75 - 5.25 V
Wiring,
B43,
N47-5
27.0 ESP brake pressure
sensor 1 (B34/1)
Supply voltage from N47-5


48
(2.14)
N47-5




50
(2.16)
Ignition: ON

4.75 - 5.25 V
Wiring,
B34/1,
N47-5
27.1 ESP brake pressure
sensor 2 (B34/2)
Supply voltage from N47-5


42
(2.8)
N47-5




44
(2.10)
Ignition: ON

4.75 - 5.25 V
Wiring,
B34/2,
N47-5
28.0 Rotating speed sensor for ESP (B45)
Supply voltage from N47-5


17
(1.17)
N47-5




18
(1.18)
Ignition: ON

4.75 - 5.25 V
Wiring,
B45,
N47-5
29.0

Membrane travel sensor (BAS) (A7/7b1)
Supply voltage from N47-5


35
(2.1)
N47-5



37
(2.3)
Ignition: ON

4.75 - 5.25 V
Wiring,
A7/7b1,
N47-5
30.0
Solenoid valve
(BAS) (B43)
Resistance

56
(2.22)
N47-5


55
(2.21)
Ignition: OFF
Disconnect (N47-5).

1 - 2
Wiring,
A7/7
31.0 CAN data line
Resistance


34
(3.L)
N47-5




33
(3.H)
Ignition: OFF

55 - 66
Wiring,
31.1
31.2
31.1 CAN element in instrument cluster (A1)
Resistance


10
(B.10)
A1




9
(B.9)
Disconnect connector B at A1 and check directly at control module.

115 - 125
A1
31.2 CAN element in engine control
module (ME-SFI) (N3/10)
Resistance


11
(D.11)
N3/10




12
(D.12)
Ignition: ON
Disconnect connector D at N3/10 and check directly at control module.


115 - 125
N3/10,
See D.M., Engines, Vol. 4, section 9.4