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LOCATION:    14.3a Heated Seats (HS)   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test scope
Test connection
 Test condition Nominal value Possible cause/Remedy
1.0   Front HS control
module (N25/5)
Voltage supply
Circuit 30

Circuit 15R

 


N25/5



N25/5

 


4



2




Ignition: OFF


Ignition:
Position "1"		 11 - 14 V Wiring.
2.0   Front HS control
module (N25/5)
Voltage supply for circuit 58d from cockpit switch
group (S6/1)

 

 

4




S6/1


 



9

Adjust cockpit illumination to HI,
Parking lamps: ON		 11 - 14 V Wiring.
3.0   Cockpit switch
group (S6/1)
Circuit 58d internal connection

 



9




S6/1


 



58d

Ignition: OFF < 1 S6/1
4.0   Cockpit switch
group (S6/1)
Circuit 31 internal connection

 

 

4




S6/1


 

 

31

 Ignition: OFF < 1 S6/1
5.0   Left front seat cushion heater element (R13/1) and left front backrest heater element (R13/2)
Voltage supply
Models 170, 208, 210



Model 202

 



X55/3


X55/3




 

 

4
(C)

2
(C)

Ignition: ON
Left front HS switch (N25/5s1) set to heating stage II.



N25/5s1 set to heating
stage I		 0 - 1 V



9 - 14 V




Proper interval indicated on multimeter.		 Wiring,
1.0,
Front HS control module (N25/5)
5.1
5.1   R13/1 and R13/2
Voltage supply
Ground
Models 170, 208, 210


Model 202


1
(C)

1
(C)

X55/3


X55/3

 

4
(C)

2
(C)

Ignition: ON
Left front HS switch (N25/5s1) set
to heating stage II.

11 - 14 V Wiring.
6.0   Left front seat cushion heater element (R13/1)
Resistance
Model 210




Model 202



Model 170, 208

 



1
(C)



3
(C)

1
(C)




X55/3




X55/3


X55/3



 



4
(C)



4
(C)

4
(C)

Disconnect connector C at X55/3.

MB tex seats


Leather seats

Cloth and MB tex seats







2.6 - 3.4

3.9 - 4.7


2.5 - 3.0


Model 170
2.0 - 2.5
Model 208
2.4 - 2.9 		R13/1
6.1   Left front backrest heater element (R13/2)
Resistance
Model 210




Model 202



Model 170, 208

 



2
(C)



1
(C)


2
(C)



X55/3




X55/3



X55/3

 

 

3
(C)



2
(C)


2
(C)

Disconnect connector C at X55/3.

MB tex seats

Leather seats


Cloth and MB tex seats



2.5 - 3.2

3.8 - 4.5


2.5 - 3.0



Model 170
2.2 - 2.7
Model 208
2.8 - 3.3 		R13/2
7.0   Right front seat cushion heater element (R13/3) and left front backrest heater element (R13/4)
Voltage supply
Models 170, 208, 210

Model 202


 

 

 

 

 

X55/4


X55/4

 

 

 


4
(C)

2
(C)

Ignition: ON
Right front HS switch (N25/5s2) set to heating stage II.


N25/5s2 set to heating
stage I

0 - 1 V


9 - 14 V




Proper interval indicated on multimeter.
Wiring,
1.0,
Front HS control module (N25/5),
7.1
7.1   R13/3 and R13/4
Voltage supply
Ground
Models 170, 208, 210


Model 202

 

1
(C)

 


1
(C)


X55/4


 

X55/4

 

4
(C)

 


2
(C)

Ignition: ON
Right front HS switch (N25/5s2) set to heating stage II.
9 - 14 V Wiring.
8.0   Right front seat cushion heater element (R13/3)
Resistance
Model 210




Model 202




Model 170, 208




1
(C)


1
(C)




1
(C)



X55/4



X55/4





X55/4

 


4
(C)



2
(C)




4
(C)

Disconnect connector C at X55/4.

MB tex seats

Leather seats


Cloth and MB tex seats



2.6 - 3.4

3.9 - 4.7


3.0 - 3.5





Model 170
2.0 - 2.5
Model 208
2.4 - 2.9 		R13/3
8.1   Right front backrest heater element (R13/4)
Resistance
Model 210




Model 202




Model 170, 208


 


2
(C)

 

3
(C)

 

2
(C)

 


X55/4

 

X55/4

 

X55/4





3
(C)

 

4
(C)

 

3
(C)

Disconnect connector C at X55/4.

MB tex seats

Leather seats


Cloth and MB tex seats



2.5 - 3.2

3.8 - 4.5


2.5 - 3.0




Model 170
2.2 - 2.7
Model 208
2.8 - 3.3 		R13/4



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