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LOCATION:    15.1 Electric Seat Adjustment (ESA)   >   27 Electrical Test Program - Test (left seat)


Electrical Test Program - Test (left seat)

Test step Test scope
Test connection
 Test condition Nominal value Possible cause/Remedy
1.0 Left front ESA control module (N32/1)
Voltage supply


1

1

1
(2)

N32/1





2

4

3
(2)

 Connector (2) unplugged from N32/1.
11 - 14 V

11 - 14 V

11 - 14 V		 Wiring,
CF relay module (K24).
2.0 Fore/aft switch (S91s1)
Resistance

4
(1)
N32/1


3
(1)

Connector (1) unplugged from N32/1.

Press switch (S91s1):
forward
backward

approx. 2.2 k


approx. 43
approx. 16 		Wiring,
S91
3.0 Fore/aft motor (M27m1)
Voltage supply

Up to 11/96

2
(7)

 

 

 

3

4
(7)

N32/1







N32/1



1
(7)

 

 

 

5

5
(7)

Connector (1) plugged at N32/1.
Set backrest vertical.
Connector (7) unplugged from N32/1.
Press switch (S91s1):
forward
backward






< 1 V

11 - 14 V
-11 to -14V

approx. 5 V
approx. 5 V

Wiring,
S91,
N32/1
[ 3.0] Fore/aft motor (M27m1)
Voltage supply
Hall sensor

As of 12/96

2
(7)

 

 

 

 

 

4
(7)


4
(7)

N32/1











N32/1



N32/1


1
(7)

 

 

 

 

 

5
(7)


5
(7)

Connector (1) plugged at N32/1.
Set backrest vertical.
Connector (7) unplugged from N32/1.
Press switch (S91s1):
forward


backward







Open connector (7) and connect to N32/1




< 1 V

for 1 second:
11 - 14 V
for 1 second:
-11 to -14 V

11 - 14 V



7.7 - 8.8 V
or
11.3 - 12.7 V
Wiring,
S91,
N32/1












N32/1



Wiring,
M27m1
4.0 Fore/aft motor (M27m1)

4
(2)



1
(2)

N32/1







1
(7)

 

2
(7)

Connectors (7) and (2) unplugged from N32/1.




Danger of being wedged in.

Bridge sockets 4 and 1 with fused jumper wire
124 589 37 63 00
Motor (M27m1)
runs.






Wiring,
M27m1
5.0 Front raise/lower
switch (S91s3)
Resistance

4
(1)
N32/1



2
(1)
Connector (1) unplugged from N32/1.

Press switch (S91s3):
raise front
lower front

approx. 2.2 k


approx. 43
approx. 16 		Wiring,
S91
6.0 Front raise/lower
motor (M27m3)
Voltage supply

Up to 11/96


2
(6)

 

 

3
(6)

4
(6)

N32/1






N32/1


N32/1



1
(6)

 

 

5
(6)

5
(6)

Connector (1) plugged in at N32/1.
Connector (6) unplugged from N32/1.
Press switch (S91s3):
raise front
lower front



< 1 V

11 - 14 V
-11 to -14 V

approx. 5 V


approx. 5 V		 Wiring,
S91,
N32/1
[6.0] Front raise/lower
motor (M27m3)
Voltage supply
Hall sensor

As of 12/96


2
(6)

 

 

 

4
(6)


4
(6)

N32/1








N32/1



N32/1



1
(6)

 

 

 

5
(6)


5
(6)

Connector (1) plugged in at N32/1.
Connector (6) unplugged from N32/1.
Press switch (S91s3):
raise front

lower front






Open connector (6) and connect to N32/1



< 1 V

for 1 second:
11 - 14 V
for 1 second:
-11 to -14 V

11 - 14 V



7.7 - 8.8 V
or
11.3 - 12.7 V
Wiring,
S91,
N32/1








N32/1



Wiring,
M27m3
7.0 Front raise/lower
motor (M27m3)


4
(2)

1
(2)

N32/1




1

(6)

5
(6)

Connectors (6) and (2) unplugged from N32/1.



Danger of being wedged in.

Bridge sockets 4 and 1 with fused jumper wire
124 589 37 63 00
Motor (M27m3)
runs.




Wiring,
M27m3
8.0 Rear raise/lower
switch (S91s2)
Resistance

4
(1)
N32/1




3
(1)
Connector (1) unplugged from N32/1.

Press switch (S91s2):
raise rear
lower rear
approx. 2.2 k


approx. 160
approx. 75
Wiring,
S91
9.0 Rear raise/lower
motor (M27m2)
Voltage supply

Up to 11/96


2
(5)

 

 

4
(5)


3
(5)

N32/1






N32/1



N32/1



1
(5)

 

 

5
(5)


5
(5)

 

 Connector (1) plugged in N32/1.
Connector (5) unplugged from N32/1.
Press switch (S91s3):
raise rear
lower rear



< 1 V

11 - 14 V
-11 to -14 V

approx. 5 V



approx. 5 V		 Wiring,
S91,
N32/1
[9.0] Rear raise/lower
motor (M27m2)
Voltage supply
Hall sensor

As of 12/96


2
(5)







4
(5)

4
(5)

N32/1








N32/1






1
(5)

 

 

 

5
(5)

5
(5)

Connector (1) plugged in at N32/1.
Connector (5) unplugged from N32/1.
Press switch (S91s3):
raise front

lower front





Open connector (5) and connect to N32/1



< 1 V

for 1 second:
11 - 14 V
for 1 second:
-11 to -14 V

11 - 14 V


7.7 - 8.8 V
or
11.3 - 12.7 V		 Wiring,
S91,
N32/1







N32/1


Wiring,
M27m2
10.0 Rear raise/lower
motor (M27m2)
Resistance


4
(2)

1
(2)

N32/1





1
(5)

2
(5)

Connector (2) and (5) unplugged from N32/1.




Danger of being wedged in.

Bridge sockets 4 and 1 with fused jumper wire
124 589 37 63 00
Motor (M27m2) runs. Wiring,
M27m2
11.0 Backrest fore/aft
switch (S91s5)
Resistance

4
(1)
N32/1


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

Press switch (S91s5):
forward
rearward


approx. 2.2 k

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

Up to 11/96


2
(8)

 

 


5
(8)


3
(8)

N32/1







N32/1



N32/1



1
(8)

 

 


4
(8)


4
(8)

Connector (1) plugged in at N32/1.
Connector (8) unplugged from N32/1.
Press switch (S91s5):
forward
rearward		 < 1 V





11 - 14 V
-11 to -14 V

approx. 5 V



approx. 5 V		 Wiring,
S91,
N32/1
[12.0] Rear raise/lower
motor (M27m5)
Voltage supply
Hall sensor

As of 12/96


2
(8)

 

 

 

5
(8)

5

N32/1








N32/1


N32/1

(8) (8)


1
(8)

 

 

 

4
(8

4

 Connector (1) plugged in at N32/1.
Connector (8) unplugged from N32/1.
Press switch (S91s5):
raise front

lower front





Open connector (8) and connect to N32/1		 < 1 V





for 1 second:
11 - 14 V
for 1 second:
-11 to -14 V

11 - 14 V


7.7 - 8.8 V
or
11.3 - 12.7 V		 Wiring,
S91,
N32/1








N32/1


Wiring,
M27m5
13.0 Rear raise/lower
motor (M27m5)
Resistance

4
(2)

1
(2)

N32/1





1
(8)

2
(8)

Connector (2) and (8) unplugged from N32/1.




Danger of being wedged in.

Bridge sockets 4 and 1 with fused jumper wire
124 589 37 63 00
Motor (M27m5) runs. Wiring,
M27m5
14.0 Head restraint raise/lower
switch (S91s4)
Resistance

4
(1)
N32/1


2
(1)
Connector (1) unplugged from N32/1.

Press switch (S91s4):
raise
lower

approx. 2.2 k


approx. 160
approx. 75 		Wiring,
S91
15.0 Head restraint raise/lower motor (M27m4)
Voltage supply

Up to 11/96


4
(9)

 

 


5
(9)


3
(9)

N32/1







N32/1



N32/1



1
(9)

 

 


2
(9)


2
(9)

Connector (1) plugged in at N32/1.
Connector (9) unplugged from N32/1.

Press switch (S91s4):
raise
lower		 < 1 V






-11 to -14 V
11 - 14 V

approx. 5 V



approx. 5 V		 Wiring,
S91,
N32/1
[15.0] Head restraint raise/lower motor (M27m4)
Voltage supply
Hall sensor

As of 12/96


1
(9)

 

 

 

5
(9)


5
(9)

N32/1








N32/1



N32/1



4
(9)

 

 

 

2
(9)


2
(9)

Connector (1) plugged in at N32/1.
Connector (9) unplugged from N32/1.
Press switch (S91s4):
raise

lower






Open connector (9) and connect to N32/1

< 1 V




for 1 second:
-11 to -14 V
for 1 second:
11 - 14 V

11 - 14 V



7.7 - 8.8 V
or
11.3 - 12.7 V

Wiring,
S91,
N32/1








N32/1



Wiring,
M27m4
16.0 Head restraint raise/lower motor (M27m4)


4
(2)

1
(2)

N32/1









1
(9)

4
(9)

Connector (9) unplugged from N32/1.



Danger of being wedged in.

Bridge sockets 4 and 1 with fused jumper wire
124 589 37 63 00
Motor (M27m4) runs.
Wiring,
M27m4
17.0 Left front power seat switch group (S91), position memory
Resistance


4

 

 

2

 

5

 


4

S91





S91



S91




S91


1

 

 

1

 

1

 


1

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

Memory button 2 switch:
Rest position:
Push button:

Memory button 3 switch:
Rest position:
Push button:


Green memory button switch:
Rest position:
Push button:





approx. 2.2 k approx. 167



approx. 2.2 k approx. 330



approx. 2.2 k approx. 330




approx. 2.2 k approx. 330

S91
18.0 Left front power seat
switch group (S91)
Voltage supply

4
4
4
(1)
N32/1





1
2
3
(1)
Connector (1) unplugged from N32/1.
approx. 5 V
approx. 5 V
approx. 5 V		 N32/1
19.0 Left seat proximity control module (N32/5)
Voltage supply

4
1
(4)
N32/1




2
2
(4)
Connector (4) unplugged from N32/1.
11 - 14 V
11 - 14 V 		N32/1
20.0 Left seat proximity control module (N32/5)
Voltage supply

N32/1



4
(4)
Move backrest backward until it rests against soft top compartment wall.
Unplug connector (4) from N32/1.
Open connector and remove the wiring.
Plug the connector in again at N32/1.
> 4 V Wiring,
N32/5
21.0 Left front power seat
switch group
illumination (S91e1)
Voltage supply

6
S91




3
S91 removed.
Connector (1) unplugged from S91.
Parking lamps turned on.		 11 - 14 V Wiring.
22.0 Left backrest lock
switch (S52/1) (left seat)
Right backrest lock
switch (S52/2) (left seat)
Resistance


5

 

 

5

N32/7





N32/7


8

 

 

10

Left backrest lock safety package (N32/7) unplugged.
Backrest latched.
Backrest unlatched.

Backrest latched.

Backrest unlatched.


< 1
> 20 k

< 1

> 20 k		 Wiring,
S52/1,
S52/2
23.0 Left front power seat
switch group (S91)
Resistance

4
4
4
(1)
N32/1





1
2
3
(1)
Connector (1) disconnected from N32/1.
approx. 2.2 k
approx. 2.2 k
approx. 2.2 k		 Wiring,
S91
24.0 Left backrest lock safety package (N32/7)
Voltage supply

1
N32/7

5
N32/7 disconnected.
Ignition: ON
Note:
If N32/7 is unplugged, the acoustical warning from the right backrest lock safety package (N32/8) sounds for approx. 20 seconds.

11 - 14 V		 24.1
24.1 Wiring between the left and right backrest lock safety package
N32/7
7


N32/8
5
Left and right backrest lock safety packages unplugged. < 1 Wiring.
25.0 Left backrest lock safety package (N32/7)
Signal output for automatic latch

N32/1


3
(4)
Connector (4) unplugged from N32/1.
Backrest unlatched.
Both doors closed.
Ignition: ON




> 4 V
Wiring,
N32/7
26.0 Seat belt/backrest lock reminder lamp (A1e9)
Ignition: ON
Start engine.
Right backrest unlatched.
Both doors closed.		 Reminder lamp must illuminate. If the nominal value is obtained:
Wiring,
N32/7

If the nominal value is not obtained:
Wiring,
A1e9
27.0 Warning signal from left backrest lock safety
package (N32/7) and from right backrest lock safety
package (N32/8)
N32/8 unplugged.
Connector N32/8 removed.
Open connector and remove socket 3.
Plug N32/8 into connector again.
Ignition: ON
Start engine
Left and right backrest latched.
Both doors closed.
Reminder lamp goes out. If the nominal value is not obtained:
Wiring,
N32/7

If the nominal value is obtained:
N32/8.



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