Test step
|
DTC |
Test scope |
|
Test connection
|
|
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
|
Convenience control
module (N57)
Voltage supply, circuit 30 |
2 
(A.2)
|
N57
 |
 24
(E.2)
|
Ignition: OFF
|
11 - 14 V |
Wiring.
|
| 2.0 |
|
Convenience control
module (N57)
Voltage supply, circuit 15R/30 |
2
(A.2)
33 (B.7)
|
|
10
(A.10)
32
(B.6)
|
Turn ignition key to
position "1".
Doors: closed
|
11 - 14 V
11 - 14 V
|
Wiring,
Convenience relay module (K24).
|
| 3.0 |
|
Convenience control
module (N57)
Voltage supply, circuit 15R |
2
(A.2)
|
N57
|
25
(E.3)
|
Turn ignition key to position "1".
|
11 - 14 V |
Wiring.
|
| 4.0 |
|
Convenience relay
module (K24)
Voltage supply |
5
5
5
|
|
|
Ignition: OFF
K24 disconnected.
Turn ignition key to position "1". |
11 - 14 V
11 - 14 V
11 - 14 V |
Wiring.
|
| 5.0 |
|
Front door contact switches (S17/3,
S17/4)
Circuit |
6
|
K24
|
2
|
Ignition: OFF
K24 disconnected.
Both front doors: CLOSED
Left front door: OPEN
Front doors: CLOSED
Right front door: OPEN
|
0 - 2 V
11 - 14 V
0 - 2 V
11 - 14 V
|
Wiring,
 5.1
|
| 5.1 |
|
Voltage supply |
23
(E.1)
|
N57
|
24
(E.2)
|
Ignition: OFF
Both front doors: CLOSED
Left front door: OPEN
Front doors: CLOSED
Right front door: OPEN
|
0 - 2 V
11 - 14 V
0 - 2 V
11 - 14 V
|
Wiring,
S17/3,
S17/4.
Model 124 PSE control module (A37/2),
Model 202: See section 3.2 PSE/CL.
Values are OK: N57.
|
| 6.0 |
|
Model 124:
Sliding/pop-up roof (M12)
Voltage supply
Model 202:
Sliding/pop-up roof (M12/1)
Voltage supply |
6
6
|
M12
M12/1
|
1
4
|
Ignition: ON
Ignition: ON
|
11 - 14 V
11 - 14 V
|
Wiring.
|
| 7.0 |
|
Sliding/pop-up roof
circuit (S13/2)
Function:
Closing sliding/pop-up roof
Voltage supply |
16
(C.4)
|
N57
|
15
(C.3)
|
Ignition: OFF
Disconnect connector C of N57.
Ignition: ON
S13/2 in rest position.
Switch held in sliding/pop-up roof close position. |
0 - 1 V
11 - 14 V |
Wiring,
S13/2.
Values are OK:
Sliding/pop-up roof relay
(M12k1 or M12/1k1).
Sliding/pop-up roof motor
(M12m1 or M12/1m1). |
| 8.0 |
|
Sliding/pop-up roof
switch (S13/2)
Function:
Opening sliding roof
Voltage supply |
16
(C.4)
|
N57
|
14
(C.2)
|
Ignition: OFF
Disconnect connector C of N57.
Ignition: ON
S13/2 in rest position.
S13/2 held in sliding roof open position
|
0 - 1 V
11 - 14 V
|
Wiring,
S13/2.
Values are OK:
Sliding/pop-up roof relay
(M12k1 or M12/1k1).
Sliding/pop-up roof motor
(M12m1 or M12/1m1). |
| 9.0 |
|
Sliding/pop-up roof
switch (S13/2)
Function:
Opening pop-up roof
Voltage supply |
16
(C.4)
|
N57
|
13
(C.1)
|
Ignition: OFF
Disconnect connector C of N57.
Ignition: ON
S13/2 in rest position.
S13/2 held in pop-up roof open position
|
0 - 1 V
11 - 14 V
|
Wiring,
S13/2.
Values are OK:
Sliding/pop-up roof relay
(M12k1 or M12/1k1).
Sliding/pop-up roof motor
(M12m1 or M12/1m1).
|
| 10.0 |
|
Left front power window switch
(S21/1)
Function: Opening
Voltage supply
|
2
(A.2)
|
N57
|
5
(A.5)
|
Ignition: ON
S21/1 in rest position
S21/1 held in open position "1".
S21/1 held in open position "2".
|
9 - 14 V
0 - 1 V
0 - 1 V
|
Wiring,
10.1
Convenience control module (N57).
|
| 10.1 |
|
Resistance |
2
(A.2)
|
N57
|
5
(A.5)
|
Ignition: OFF
Disconnect connector A of N57.
S21/1 in rest position
S21/1 held in open position "1".
S21/1 held in open position "2".
|
>20 k
0 - 2
0 - 2
|
Wiring,
S21/1.
|
| 11.0 |
|
Left front power window switch
(S21/1)
Function: Closing
Voltage supply |
2
(A.2)
|
N57
|
8
(A.8)
|
Ignition: ON
S21/1 in rest position.
S21/1 held in close position.
|
9 - 14 V
0 - 1 V
|
Wiring,
11.1,
Convenience control module (N57).
|
| 11.1 |
|
Resistance |
2
(A.2)
|
N57
|
8
(A.8)
|
Ignition: OFF
Disconnect connector A of N57.
S21/1 in rest position.
S21/1 held in close position. |
>20 k
0 - 2
|
Wiring,
S21/1.
|
| 12.0 |
|
Left front power window switch
(S21/1)
Function: One-touch operation
Voltage supply |
2
(A.2)
|
N57
|
12
(A.12)
|
Ignition: ON
S21/1 in rest position.
S21/1 held in open position "1".
S21/1 held in open position "2".
|
9 - 14 V
9 - 14 V
0 - 1 V
|
Wiring,
12.1,
Convenience control module (N57).
|
| 12.1 |
|
Resistance |
2
(A.2)
|
N57
|
12
(A.12)
|
Ignition: OFF
Disconnect connector A of N57.
S21/1 in rest position.
S21/1 held in open position "1".
S21/1 held in open position
"2". |
>20 k
>20 k
0 - 2
|
Wiring,
S21/1.
|
| 13.0 |
|
Right front power window switch
(S21/2)
Function: Opening
Voltage supply |
2
(A.2)
|
N57
|
1
(A.1)
|
Ignition: ON
S21/2 in rest position.
S21/2 held in open position.
"1".
S21/2 held in open position "2".
|
9 - 14 V
0 - 1 V
0 - 1 V
|
Wiring,
13.1,
Convenience control module (N57).
|
| 13.1 |
|
Resistance |
2
(A.2)
|
N57
|
1
(A.1)
|
Ignition: OFF
Disconnect connector A of N57.
S21/2 in rest position.
S21/2 held in open position "1".
S21/2 held in open position "2".
|
>20 k
0 - 2
0 - 2
|
Wiring,
S21/2.
|
| 14.0 |
|
Right front window
circuit (S21/2)
Function: Closing
Voltage supply |
2
(A.2)
|
N57
|
4
(A.4)
|
Ignition: ON
S21/2 in rest position.
S21/2 held in close position.
|
9 - 14 V
0 - 1 V
|
Wiring,
14.1,
Convenience control module (N57).
|
| 14.1 |
|
Resistance |
2
(A.2)
|
N57
|
4
(A.4)
|
Ignition: OFF
Disconnect connector A of N57.
S21/2 in rest position.
S21/2 held in close
position.
|
>20 k
0 - 2 |
Wiring,
S21/2.
|
| 15.0 |
|
Right front window
circuit (S21/2)
Function: One-touch operation
Voltage supply |
2
(A.2)
|
N57
|
9
(A.9)
|
Ignition: ON
S21/2 in rest position.
S21/2 held in open position "1".
S21/2 held in open position "2".
|
9 - 14 V
9 - 14 V
0 - 1 V
|
Wiring,
15.1,
Convenience control module (N57).
|
| 15.1 |
|
Resistance |
2
(A.2)
|
N57
|
9
(A.9)
|
Ignition: OFF
Disconnect connector A N57.
S21/2 in rest position.
S21/2 held in open position "1".
S21/2 held in open position "2".
|
>20 k
>20 k
0 - 2
|
Wiring,
S21/2.
|
| 16.0 |
|
Left rear power window switch
(door) (S21/3), Left rear power window switch (center console) (S21/5)
Function: Opening
Voltage supply |
33
(B.7)
|
N57
|
27
(B.1)
|
Ignition: ON
Rear power windows safety switch (center console) (S21/7): OFF
S21/3 and S21/5 in
rest position.
S21/3 held in
open position.
S21/5 held in
open position.
|
9 - 14 V
0 - 1 V
0 - 1 V
|
Wiring,
16.1
Values are OK:
20.0,
Convenience control module (N57).
|
| 16.1 |
|
Left rear power window switch (door)
(S21/3)
Resistance |
33
(B.7)
|
N57
|
27
(B.1)
|
Ignition: OFF
Disconnect connector B of N57.
S21/3 and S21/5 in
rest position.
S21/3 held in
open position. |
>20 k
0 - 3
|
Wiring,
S21/3,
S21/5,
16.2
|
| 16.2 |
|
Left rear power window switch (center
console) (S21/5)
Resistance
|
33
(B.7)
|
N57
|
27
(B.1)
|
Ignition: OFF
Disconnect connector B of N57.
Disconnect S21/3 from wiring harness.
S21/5 in rest position.
S21/5 held in open position.
|
>20 k
0 - 2
|
Wiring,
S21/5.
|
| 17.0 |
|
Left rear power window switch
(door) (S21/3), Left rear power window switch (center console) (S21/5)
Function: Closing
Voltage supply |
33
(B.7)
|
N57
|
34
(B.8)
|
Ignition: ON
Rear power windows safety switch (center console) (S21/7): OFF
S21/3 and S21/5 in
rest position.
S21/3 held in
close position.
S21/5 held in
close position.
|
9 - 14 V
0 - 1 V
0 - 1 V |
Wiring,
17.1
Values are OK:
20.0,
Convenience control module (N57).
|
| 17.1 |
|
Left rear power window switch (door)
(S21/3)
Resistance |
33
(B.7)
|
N57
|
34
(B.8)
|
Ignition: OFF
Disconnect connector B from N57.
S21/3 and S21/5 held in
rest position.
S21/3 held in
close position.
|
>20 k
0 - 3
|
Wiring,
S21/3,
S21/5,
17.2
|
| 17.2 |
|
Left rear power window switch (center
console) (S21/5)
Resistance |
33
(B.7)
|
N57
|
34
(B.8)
|
Ignition: OFF
Disconnect connector B of
N57.
Disconnect S21/3 from wiring harness.
S21/5 in rest position.
S21/5 in close position.
|
>20 k
0 - 2
|
Wiring,
S21/5.
|
| 18.0 |
|
Right rear power window switch
(door) (S21/4), Right rear power window switch (center console) (S21/6)
Function: Opening
Voltage supply |
33
(B.7)
|
N57
|
38
(B.12)
|
Ignition: ON
Rear power windows safety switch (center console) (S21/7): OFF
S21/4 and S21/6 in rest position.
S21/4 held in
open position.
S21/6 held in
open position.
|
9 - 14 V
0 - 1 V
0 - 1 V |
Wiring,
18.1
Values are OK:
20.0,
Convenience control module (N57). |
| 18.1 |
|
Right rear power window switch (door)
(S21/4)
Resistance |
33
(B.7)
|
N57
|
38
(B.12)
|
Ignition: OFF
Disconnect connector B of
N57.
S21/4 and S21/6 held in
rest position.
S21/4 held in open position.
|
>20 k
0 - 3
|
Wiring,
S21/4,
S21/6,
18.2
|
| 18.2 |
|
Right rear power window switch (center
console) (S21/6)
Resistance |
33
(B.7)
|
N57
|
38
(B.12)
|
Ignition: OFF
Disconnect connector B from N57.
Disconnect S21/4 from wiring harness.
S21/6 in rest position.
S21/6 held in
open position
|
>20 k
0 - 3
|
Wiring,
S21/6.
|
| 19.0 |
|
Right rear power window switch
(S21/4), Right rear power window switch
(center console) (S21/6)
Function: Closing
Voltage supply |
33
(B.7)
|
N57
|
35
(B.9)
|
Ignition: ON
Rear power window safety switch (center console) (S21/7): OFF
S21/4 and S21/6 in rest position.
S21/4 held in
close position.
S21/6 held in
close position.
|
9 - 14 V
0 - 1 V
0 - 1 V
|
Wiring,
19.1
Values are OK:
20.0,
Convenience control module (N57).
|
| 19.1 |
|
Right rear power window switch (door)
(S21/4)
Resistance |
33
(B.7)
|
N57
|
35
(B.9)
|
Ignition: OFF
Disconnect connector B of N57.
S21/4 and S21/6 in rest position.
S21/4 in close position.
|
>20 k
0 - 3
|
Wiring,
S21/4,
S21/6,
19.2
|
| 19.2 |
|
Right rear power window switch (center
console) (S21/6)
Resistance |
33
(B.7)
|
N57
|
35
(B.9)
|
Ignition: OFF
Disconnect connector B of
N57.
Disconnect S21/4 from wiring harness.
S21/6 in rest position.
S21/6 held in
close position.
|
>20 k
0 - 2 |
Wiring,
S21/6.
|
| 20.0 |
|
Rear power windows safety switch
(center console) (S21/7)
Voltage supply |
33
(B.7)
|
N57
|
27
(B.1)
|
Ignition: ON
Rear power windows safety switch (center console) (S21/7): Unlocked
S21/3 held in open position.
Rear power window safety switch (center console)
(S21/7): Locked
S21/3 held in open position. |
0 - 1 V
9 - 14 V
|
Wiring,
20.1
Values are OK:
16.0,
Convenience control module (N57).
|
| 20.1 |
|
Resistance
|
33
(B.7)
|
N57
|
27
(B.1)
|
Ignition: OFF
Disconnect connector B of N57.
S21/7 in unlocked position.
S21/3 held in open position.
S21/7 in locked position.
S21/3 held in open position. |
0 - 3
>20 k
|
Wiring,
S21/7.
|
| 21.0 |
Model 202
only |
Left and right front door lock
switch (convenience) (S86/1, 87/1) and trunk lid lock switch
(convenience) (S88/2)
Function: Opening
Voltage supply
Function: Closing
Voltage supply
|
2
(A.2)
2
(A.2)
|
|
18
(D.2)
22
(D.6)
|
S86/1, S87/1 and S88/2 in rest
position.
S86/1 in open position.
S87/1 in open position.
S88/2 in open position.
S86/1, S87/1 and S88/2 in rest position.
S86/1 in close position.
S87/1 in close position.
S88/2 in close position.
|
9 - 14 V
0 - 1 V
0 - 1 V
0 - 1 V
9 - 14 V
0 - 1 V
0 - 1 V
0 - 1 V
|
Wiring,
21.1
|
| 21.1 |
Model 202 only |
S86/1, S87/1 and S88/2
Function: Opening
Resistance
Function: Closing
Resistance
|
2
(A.2)
2
(A.2)
|
|
18
(D.2)
22
(D.6)
|
Disconnect and cover battery negative
cable.
Disconnect connector D of N57.
S86/1, S87/1 and S88/2 in rest position.
S86/1 in open position.
S87/1 in open position.
S88/2 in open position.
S86/1, S87/1 and S88/2 in rest position.
S86/1 in close position.
S87/1 in close position.
S88/2 in close position.
|
>20 k
0 - 5
0 - 5
0 - 5
>20 k
0 - 5
0 - 5
0 - 5
|
Wiring,
S86/1,
S87/1,
S88/2,
PSE control module (A37/4, A37/5).
See section 3.2 (PSE/CL).
|
| 22.0 |
Model 124 without ATA only |
Left and right front door lock
switch (convenience) (S86/1, S87/1) and trunk lid lock switch (convenience)
(S88/2)
Function: Opening
Voltage supply
Function: Opening
Voltage supply
|
2
(A.2)
|
N57
|
20
(D.4)
|
S86/1, S87/1 and S88/2 in rest
position.
S86/1 in open position.
S87/1 in open position.
S88/2 in open position.
S86/1 in close position.
S87/1 in close position.
S88/2 in close position.
|
9 - 14 V
0 - 1 V
0 - 1 V
0 - 1 V
0 - 1 V
0 - 1 V
0 - 1 V |
Wiring,
22.1
|
| 22.1 |
|
S86/1, S87/1, and S88/2
Function: Opening
Resistance
Function: Closing
Resistance
|
2
(A.2)
|
N57
|
20
(D.4)
|
Disconnect and cover battery negative
cable.
Disconnect connector D of N57.
S86/1, S87/1 and S88/2 in rest position.
S86/1 in open position.
S87/1 in open position.
S88/2 in open position.
S86/1 in close position.
S87/1 in close position.
S88/2 in close position.
|
>20 k
0 - 5
0 - 5
0 - 5
0 - 5
0 - 5
0 - 5
|
Wiring,
S86/1,
S87/1,
S88/2.
|
| 23.0 |
Model 124 with ATA only |
Left and right front door lock
switch (convenience) (S86/1, S87/1) and trunk lid lock switch (convenience)
(S88/2)
Voltage supply |
2
(A.2)
2
(A.2)
2
(A.2)
|
|
18
(D.2)
22
(D.6)
20
(D.4)
|
S86/1 and S87/1 in rest position.
S86/1 in open position.
S87/1 in open position.
S86/1 and S87/1 in rest position.
S86/1 in close position.
S87/1 in close position.
S88/2 in rest position.
S88/2 in open position.
S88/2 in open position.
|
9 - 14 V
0 - 1 V
0 - 1 V
9 - 14 V
0 - 1 V
0 - 1 V
9 - 14 V
0 - 1 V
0 - 1 V
|
Wiring,
23.1
|
| 23.1 |
|
S86/1and S87/1
Resistance |
2
(A.2)
2
(A.2)
|
|
18
(D.2)
22
(D.6)
|
Ignition: OFF
Disconnect connector D of
N57.
S86/1 and S87/1 in
rest position.
S86/1in open position.
S87/1 in open position.
S86/1 and S87/1 in
rest position.
S86/1in close position.
S87/1 in close position.
|
>20 k
0 - 5
0 - 5
>20 k
0 - 5
0 - 5
|
Wiring,
S86/1,
S87/1,
23.2
|
| 23.2 |
|
S88/2
Resistance |
2
(A.2)
|
N57
|
20
(D.4)
|
Ignition: OFF
Disconnect connector D of
N57.
S88/2 in rest position.
S88/2 in open position.
S88/2 in open position.
|
>20 k
0 - 5
0 - 5
|
Wiring,
S88/2.
|
| 24.0 |
Model 124 only |
Left front door
actuator (S47)
Voltage supply |
21
(D.5)
2
(A.2)
|
|
24
(E.2)
21
(D.5)
|
Ignition: OFF
Vehicle unlocked.
Vehicle locked.
Vehicle unlocked.
Vehicle locked.
|
0 - 1 V
11 - 14 V
11 - 14 V
0 - 1 V
|
Wiring,
S47,
Supply pump (central locking system/orthopedic
backrest) (M14/2).
Anti-theft alarm control
module (N26).
|
| 25.0 |
Model 124 only |
Right front door
actuator (S47)
Voltage supply |
19
(D.3)
2
(A.2)
|
|
24
(E.2)
19
(D.3)
|
Ignition: OFF
Vehicle unlocked.
Vehicle locked.
Vehicle unlocked.
Vehicle locked.
|
0 - 1 V
11 - 14 V
11 - 14 V
0 - 1 V
|
Wiring,
S48,
Warning buzzer contact (exterior lamps/central locking system) (S88/2).
Supply pump (central locking system/orthopedic
backrest)(M14/2).
Anti-theft alarm control
module (N26).
|
| 26.0 |
Model 124 only |
Trunk lid actuator (S49)
Voltage supply |
17
(D.1)
2
(A.2)
|
|
24
(E.2)
17
(D.1)
|
Ignition: OFF
Vehicle unlocked
Vehicle locked
Vehicle unlocked
Vehicle locked
|
0 - 1 V
11 - 14 V
11 - 14 V
0 - 1 V
|
Wiring,
S49,
Supply pump (central locking system/orthopedic
backrest) (M14/2).
Anti-theft alarm control
module (N26).
|
| 27.0 |
|
Convenience relay
module (K24)
Function:Convenience feature
Voltage supply |
6 |
K24
|
2
|
Ignition: OFF
Doors: Closed
Lock vehicle and hold key in lock position. |
0 - 2 V
11 - 14 V
|
Wiring,
Convenience control module (N57).
|
| 28.0 |
|
Left front power window motor
(M10/3) |
2
(A.2)
11
(A.11)
|
|
|
Ignition: OFF
 CAUTION!
Disconnect connector A
of control module (N57).
Ignition: ON
Bridge sockets 11 and 10 with fused jumper wire
124 589 37 63.
|
Window opens.
|
Wiring,
M10/3.
|
| 29.0 |
|
Right front power window motor
(M10/4) |
2
(A.2)
3
(A.3)
|
|
7
(A.7)
10
(A.10)
|
Ignition: OFF
CAUTION!
Disconnect connector A
of control module (N57).
Ignition: ON
Bridge sockets 3 and 10 with fused jumper wire
124 589 37 63.
|
Window opens.
|
Wiring,
M10/4.
|
| 30.0 |
|
Left rear power window
motor (M10/5) |
33
(B.7)
28
(B.2)
|
|
|
Ignition: OFF
CAUTION!
Disconnect connector B
of control module (N57).
Ignition: ON
Bridge sockets 28 and 32 with fused jumper wire
124 589 37 63
|
Window opens.
|
Wiring,
M10/5.
|
| 31.0 |
|
Right rear power window
motor (M10/6) |
33
(B.7)
37
(B.11)
|
|
|
Ignition: OFF
CAUTION!
Disconnect connector B
of control module (N57).
Ignition: ON
Bridge sockets 32 and 37 with fused jumper wire
124 589 37 63
|
Window opens.
|
Wiring,
M10/6.
|
Printable
version
