STI Home
Body And Accessories
  Volume 1
Volume 1.1
Volume 2
Volume 2.1
Volume 3
Volume 4
Volume 4.1
Volume 5
Volume 5.1
Volume 6
Chassis & Drivetrain
Engines
Diesel Engines
Info. / Comm.
Climate Control
Diagnostic Manual, Body and Accessories,
Volume 5

 Printable version
LOCATION:    15.2b Electric Seat Adjustment (ESA)   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Electrical Test Program - Test (left seat)
Test step Test scope
Test connection
 Test condition Nominal value Possible cause/Remedy
1.0 Left front power seat control module (N32/1)
Voltage supply

11
11
(1)
N32/1




2
3
(1)
Ignition: ON
Connector (1) from N32/1 disconnected.		 11 - 14 V Wiring.
   

11
(1)
N32/1



9
(1)
Ignition: OFF
Connector (1) from N32/1 disconnected.
Door open




11 - 14 V
 
2.0 Left front power seat switch group (S91)
Voltage supply

6
6
6
6
S91





1
8
3
5
Ignition: ON
Connector (1) from N32/1 disconnected.		 approx. 5 V Wiring,
N32/1.
3.0 Fore/aft switch (S91s1)
Resistance



5
(1)


N32/1






12
(1)
Connector (1) from N32/1 disconnected.


Press switch (S91s1):
forward
backward


approx. 2.2 k


approx. 42 approx. 16
Wiring,
S91.
4.0 Fore/aft motor (M27m1)
Voltage supply



2
(5)

 





3
(5)

 

 

 

 


4
5
(5)


N32/1








N32/1






Convenience feature
Coupé only
(if applicable)


N32/1





1
(5)

 





1
(5)

 

 

 

 


6
6
(5)

Ignition: ON
Connector (5 VZ) from N32/1 disconnected.

Press switch (S91s1):
forward
backward



Fold left front seat backrest:
forward
backward







< 1 V




11 - 14 V
-11 to -14 V



< 1 V

11 - 14 V
-11 to -14 V









approx. 5 V

S91s1,
N32/1,
Left front seatback
microswitch (S91/1) (Coupé only, if applicable).
5.0 Fore/aft motor (M27m1)
Resistance


6
(5)

N32/1



5
(5)
Connector (5 VZ) from N32/1 disconnected.

approx. 2.2 k		 M27m1.
   

4
6
(5)
N32/1




5
4
(5)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k		  
   

1
(5)
N32/1



2
(5)
 
0.5 - 15 		 
   

 

 



1
(5)

Convenience feature
Coupé only
(if applicable)
N32/1


 

 

 

3
(5)

 





0.5 - 15 		 
6.0 Front raise/lower
switch (S91s3)
Resistance

 

4
(1)


N32/1

 

12
(1)

Connector (1) from N32/1 disconnected.


Press switch (S91s3):
raise front
lower front


approx. 2.2 k



approx. 42 approx. 16 		Wiring,
S91.
7.0 Front raise/lower
motor (M27m3)
Voltage supply

 

2
(6)


N32/1

 

1
(6)

Ignition: ON
Connector (6 HV) from N32/1 disconnected.

Press switch (S91s3):
raise front
lower front


< 1 V





11 - 14 V
-11 to -14 V		 N32/1.
   

4
5
(6)
N32/1




6
6
(6)
 
approx. 5 V		  
8.0 Front raise/lower
motor (M27m3)
Resistance

 

6
(6)


N32/1

 

5
(6)

Connector (6 HV) from N32/1 disconnected.



approx. 2.2 k		 M27m3.
   

4
6
(6)
N32/1




5
4
(6)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k
 
   

1
(6)
N32/1



2
(6)
 
0.5 - 15 		 
9.0 Rear raise/lower
switch (S91s2)
Resistance

 

5
(1)


N32/1

 

12
(1)

Connector (1) from N32/1 disconnected.


Press switch (S91s2):
raise rear
lower rear

approx. 2.2 k


approx. 156
approx. 72
Wiring,
S91.
10.0 Rear raise/lower
motor (M27m2)
Voltage supply

 

2
(4)


N32/1

 

1
(4)

Ignition: ON
Connector (4 HH) from N32/1 disconnected.

Press switch (S91s2):
raise rear
lower rear

< 1 V





11 - 14 V
-11 to -14 V
N32/1.
   

4
5
(4)
N32/1




6
6
(4)
 
approx. 5 V		  
11.0 Rear raise/lower
motor (M27m2)
Resistance

 

6
(4)


N32/1

 

5
(4)

Connector (4 HH) from N32/1 disconnected.



approx. 2.2 k		 M27m2.
   

4
4
(4)
N32/1




5
6
(4)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k
 
 

1
(4)
N32/1



2
(4)
 
0.5 - 15 		 
12.0 Backrest fore/aft
switch (S91s5)
Resistance

 

12
(1)


N32/1



1
(1)
Connector (1) from N32/1 disconnected.


Press switch (S91s5):
forward
backward


approx. 2.2 k



approx. 42
approx. 16 		Wiring,
S91.
13.0 Backrest fore/aft
motor (M27m5)
Voltage supply

 

2
(7)


N32/1

 

1
(7)

Ignition: ON
Connector (7) from N32/1 disconnected.

Press switch (S91s5):
forward
backward


< 1 V




11 - 14 V
-11 to -14 V		 N32/1.
   

4
5
(7)
N32/1




6
6
(7)
 
approx. 5 V		  
14.0 Backrest fore/aft
motor (M27m5)
Resistance

 

6
(7)


N32/1

 

5
(7)

Connector (7) from N32/1 disconnected.



approx. 2.2 k		 M27m5.
   

4
6
(7)
N32/1




5
4
(7)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k
 
 

1
(7)
N32/1



2
(7)
 
0.5 - 15 		 
15.0 Head restraint raise/lower
switch (S91s4)
Resistance

 

4
(1)


N32/1

 

12
(1)

Connector (1) from N32/1 disconnected.


Press switch (S91s4):
raise
lower


approx. 2.2 k



approx. 156 approx. 72 		Wiring,
S91.
16.0 Head restraint raise/lower motor (M27m4)
Voltage supply


1
(8)

N32/1

 

2
(8)

Ignition: ON
Connector (8) from N32/1 disconnected.

Press switch (S91s4):
raise
lower


< 1 V




-11 to -14 V
11 - 14 V		 N32/1.
   

4
5
N32/1


(8) (8)


6
6

 
approx. 5 V		  
17.0 Head restraint raise/lower motor (M27m4)
Resistance

 

6
(8)


N32/1

 

5
(8)

Connector (8) from N32/1 disconnected.



approx. 2.2 k		 M27m4.
   

5
6
(8)
N32/1




4
4
(8)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k
 
 

2
(8)
N32/1


1
(8)
 
0.5 - 15 		 
18.0 Seat cushion fore/aft
switch (S91s10)
Resistance

 

8
(1)


N32/1

 

12
(1)

Connector (1) from N32/1 disconnected.


Press switch (S91s10):
forward
backward


approx. 2.2 k



approx. 43
approx. 16 		Wiring,
S91.
19.0 Seat cushion fore/aft
motor (M27m6)
Voltage supply

 

1
(3)


N32/1

 

2
(3)

Ignition: ON
Connector (3) from module
N32/1 disconnected.

Press switch (S91s10):
forward
backward


< 1 V





11 - 14 V
-11 to -14 V		 N32/1.
   

4
5
(3)
N32/1




6
6
(3)
 
approx. 5 V		  
20.0 Seat cushion fore/aft
motor (M27m6)
Resistance

 

5
(3)


N32/1

 

6
(3)

Connector (3) from N32/1 disconnected.



approx. 2.2 k		 M27m6.
   

5
6
(3)
N32/1




4
4
(3)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k
 
 

2
(3)
N32/1



1
(3)
 
0.5 - 15 		 
21.0 Memory button
switch (S91s9)
Resistance

 

5
(1)


N32/1

 

12
(1)

Connector (1) from N32/1 disconnected.
Memory button 1 switch:
Rest position:
Push button:



2.2 k
approx. 290 		Wiring,
S91.
   

4
(1)
N32/1


12
(1)
Memory button 2 switch:
Rest position:
Push button:



2.2 k
approx. 290 		 
   

1
(1)
N32/1


12
(1)
Memory button 3 switch:
Rest position:
Push button:



2.2 k
approx. 156 		 
   

1
(1)
N32/1



12
(1)
Green memory
button switch:
Rest position:
Push button:



2.2 k
approx. 290 		 
22.0 Illumination (S91e1)
Voltage supply

4
S91

2
Connector disconnected.
Parking lamps: ON		 11 - 14 V Wiring.
23.0 Illumination (S91e1)
Resistance

4
S91

2
Connector (1) at seat switch group (S92) disconnected. approx. 10


Lamp,
S91.

 

Electrical Test Program - Test (right seat)
Test step Test scope
Test connection
 Test condition Nominal value Possible cause/Remedy
24.0 Right front power seat control module (N32/2)
Voltage supply

11
11
(1)
N32/2




3
2
(1)
Ignition: ON
Connector (1) from N32/2 disconnected.		 11 - 14 V Wiring.
   

11
(1)
N32/2



9
(1)
Ignition: OFF
Connector (1) from N32/2 disconnected.
Door open.




11 - 14 V		  
25.0 Right front power seat switch group (S92)
Voltage supply

5
5
5
5
S92





2
7
4
6
Ignition: ON
Connector (1) from N32/2 disconnected.
approx. 5 V		 Wiring,
N32/2.
26.0 Fore/aft switch (S92s1)
Resistance

 

5


N32/2

 

12

 Connector (1) from N32/2 disconnected.

Press switch (S92s1):
forward
backward



approx. 2.2 k
approx. 42
approx. 16
Wiring,
S92.
27.0 Fore/aft motor (M28m1)
Voltage supply

 

2
(5)


N32/2

 

1
(5)

Ignition: ON
Connector (5 VZ) from N32/2 disconnected.

Press switch (S92s1):
forward
backward

< 1 V





11 - 14 V
-11 to -14 V
Fore/aft switch (S92s1),
Left front power seat control
module (N32/2),
Right front seatback
microswitch (S92/1) (Coupé only, if applicable).
   

3
(5)
N32/2


1
(5)
 
< 1 V		  
   
Fold right front seat backrest:
forward
backward

11 - 14 V

-11 to -14 V
 
   

 

 

 


4
5
(5)

Convenience feature
Coupé only
(if applicable)

N32/2



 

 

 


6
6
(5)

 






approx. 5 V		  
28.0 Fore/aft motor (M28m1)
Resistance

 

6
(5)


N32/2

 

5
(5)

Connector (5 VZ) from N32/2 disconnected.

approx. 2.2 k		 M28m1.
   


4
6
(5)

N32/2




5
4
(5)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k
 
 

1
(5)
N32/2



2
(5)
 
0.5 - 15 		 
 

 

 

 

1
(5)

Convenience feature
Coupé only
(if applicable)
N32/2


 

 

 

3
(5)

 


0.5 - 15 		 
29.0 Front raise/lower
switch (S92s3)
Resistance

 

4
(1)


N32/2

 

12
(1)

Disconnect connector (1) from N32/2.


Press switch (S92s3):
raise front
lower front


approx. 2.2 k



approx. 42
approx. 16 		Wiring,
S92.
30.0 Front raise/lower
motor (M28m3)
Voltage supply

 

2
(6)


N32/2

 

1
(6)

Ignition: ON
Connector (6 HV) from N32/2 disconnected.

Press switch (S92s3):
raise front
lower front


< 1 V





11 - 14 V
-11 to -14 V		 N32/2.
   


4
5
(6)

N32/2




6
6
(6)
 
approx. 5 V		  
31.0 Front raise/lower
motor (M28m3)
Resistance

 

6
(6)


N32/2

 

5
(6)

Connector (6 HV) from N32/2 disconnected.


approx. 2.2 k		 M28m3.
   

4
6
(6)
N32/2



5
4 '
(6)

Note value.
Note value.

Total of two values:



approx.
2.2 - 2.4 k
 
   

1
(6)
N32/2



2
(6)
 
0.5 - 15 		 
32.0 Rear raise/lower
switch (S92s2)
Resistance

 

5
(1)


N32/2

 

12
(1)

Connector (1) from N32/2 disconnected.


Press switch (S92s2):
raise rear
lower rear


approx. 2.2 k



approx. 156
approx. 72 		Wiring,
S92.
33.0 Rear raise/lower
motor (M28m2)
Voltage supply

 

2
(4)


N32/2

 

1
(4)

Ignition: ON
Connector (4 HH) from N32/2 disconnected.

Press switch (S92s2):
raise rear
lower rear


< 1 V





11 - 14 V
-11 to -14 V		 N32/2.
   

4
5
(4)
N32/2




6
6
(4)
 
approx. 5 V		  
34.0 Rear raise/lower
motor (M28m2)
Resistance

 

6
(4)


N32/2

 

5
(4)

Connector (4 HH) from N32/2 disconnected.




approx. 2.2 k		 M28m2.
   


4
6
(4)

N32/2




5
4
(4)

Note value.
Note value.

Total of two values:




approx.
2.2 - 2.4 k
 
 

1
(4)
N32/2



2
(4)
 
0.5 - 15 		 
35.0 Backrest fore/aft
switch (S92s5)
Resistance

 

1
(1)


N32/2

 

12
(1)

Connector (1) from N32/2 disconnected.


Press switch (S92s5):
forward
backward


approx. 2.2 k



approx. 42
approx. 16 		Wiring,
S92.
36.0 Backrest fore/aft
motor (M28m5)
Voltage supply

 

2
(7)


N32/2

 

1
(7)

Ignition: ON
Connector (7) from N32/2 disconnected.

Press switch (S92s5):
forward
backward



< 1 V



11 - 14 V
-11 to -14 V

 N32/2.
   


4
5
(7)

N32/2




6
6
(7)

 
approx. 5 V		  
37.0 Backrest fore/aft
motor (M28m5)
Resistance

 

6
(7)


N32/2

 

5
(7)

Connector (7) from N32/2 disconnected.



approx. 2.2 k		 M28m5.
   

4
6
(7)
N32/2




5
4
(7)

Note value.
Note value.

Total of two values:



approx.
2.2 - 2.4 k
 
 

1
(7)
N32/2



2
(7)
 
0.5 - 15 		 
38.0 Head restraint raise/lower
switch (S92s4)
Resistance

 

4
(1)


N32/2

 

12
(1)

Connector (1) from N32/2 disconnected.


Press switch (S92s4):
raise
lower


approx. 2.2 k



approx. 156 approx. 72 		Wiring,
S92.
39.0 Head restraint raise/lower motor (M28m4)
Voltage supply

 

1
(8)


N32/2

 

2
(8)

Ignition: ON
Connector (8) from module (N32/2) disconnected.

Press switch (S92s4):
raise
lower


< 1 V





-11 to -14 V
11 - 14 V		 N32/2.
   


4
5
(8)

N32/2




6
6
(8)
 
approx. 5 V		  
40.0 Head restraint raise/lower motor (M28m4)
Resistance

 

5
(8)


N32/2

 

6
(8)

Connector (8) from N32/2 disconnected.



approx. 2.2 k		 M28m4.
   

5
6
(8)
N32/2




4
4
(8)

Note value.
Note value.

Total of two values:



approx.
2.2 - 2.4 k
 
 

1
(8)
N32/2



2
(8)
 
0.5 - 15 		 
41.0 Seat cushion fore/aft
switch (S92s10)
Resistance

 

8
(1)


N32/2

 

12
(1)

Connector (1) from N32/2 disconnected.


Press switch (S92s10):
forward
backward


approx. 2.2 k



approx. 43
approx. 16 		Wiring,
S92.
42.0 Seat cushion fore/aft
motor (M28m6)
Voltage supply


1
(3)

N32/2

 

2
(3)

Ignition: ON
Connector (3) from module (N32/2) disconnected.

Press switch (S92s10):
forward
backward



< 1 V


 

11 - 14 V
-11 to -14 V

 N32/2.
   

4
5
(3)
N32/2




6
6
(3)
 
approx. 5 V		  
43.0 Seat cushion fore/aft
motor (M28m6)
Resistance

 

6
(3)


N32/2

 

5
(3)

Connector (3) from N32/2 disconnected.



approx. 2.2 k		 M28m6.
   

5
6
(3)
N32/2




4
4
(3)

Note value.
Note value.

Total of two values:



approx.
2.2 - 2.4 k
 
   

1
(3)
N32/2



2
(3)
 
0.5 - 15 		 
44.0 Memory button
switch (S92s9)
Resistance

 

5
(1)


N32/2

 

12
(1)

Connector (1) from N32/2 disconnected.
Memory button 1 switch:
Rest position:
Push button:


2.2 k
approx. 290 		Wiring,
S92.
   

4
(1)
N32/2


12
(1)
Memory button 2 switch:
Rest position:
Push button:



2.2 k
approx. 290 		 
   

1
(1)
N32/2


12
(1)
Memory button 3 switch:
Rest position:
Push button:

2.2 k
approx. 156 		 
   

1
(1)
N32/2



12
(1)
Green memory
button switch:
Rest position:
Push button:

2.2 k
approx. 290
 
45.0 Illumination (S92e1)
Voltage supply

3
S92

1
Connector disconnected.
Parking lamps: ON		 11 - 14 V Wiring.
46.0 Illumination (S92e1)
Resistance

3
S92

1
Connector (1) disconnected at seat switch group (S92). approx. 10


Lamp,
S92.
47.0
Coupé only
(if applicable)		 Left front seatback microswitch (S91/1)
Resistance



1
N32/2

2
Connector (9) disconnected
N32/2.
Left front seatback:
forward
backward


0 - 2
>20 k
Wiring,
S91/1.



48.0
Coupé only
(if applicable)		 Right front seatback microswitch (S92/1)
Resistance

1
N32/2

2
Connector (9) disconnected
N32/2.
Right front seatback:
forward
backward


0 - 2
>20 k
Wiring,
S92/1.
49.0
Coupé only
(if applicable)		 Left/right front door
switch (S17/3, S17/4)
Voltage supply

11
(5)
N32/1


10
(5)
Remove fuse (F3-17).
Connector (1) disconnected.
Ignition: OFF
Front doors: CLOSED

Drivers door: OPEN

Right front door: OPEN






11 - 14 V


<2 V


<2 V		 Wiring,
S17/3,
S17/4,
Convenience control module (N57),
ATA control module (N26),
PSE control module (A37),
N32/2.
50.0
Coupé only
(if applicable)		 Left front power seat control module (N32/1)
Programming

3
(2)
N32/1


+
Connector (2) disconnected.
Press memory button 1 on left front power seat switch group.


Contact connector (2).
Using S91 operate head restraint to upper and lower stops.
Front seat travels automatically to front and rear stops.

Head restraint
travels up and down.		 N32/1.

51.0
Coupé only
(if applicable)

 Left front power seat control module (N32/2)
Programming


3
(2)
N32/1


+
Connector (2) disconnected
Press memory switch 2 on S92.


Contact connector (2)
Using S92 operate head restraint to upper and lower stops.

Front seat travels automatically to front and rear stops.

Head restraint
travels up and down.
N32/2.



© 2009 Mercedes-Benz USA, LLC