| Test step |
DTC |
Test scope
|
Test connection
|
Test condition
|
Nominal value
|
Possible cause/Remedy
|
| 1.0 |
 
  |
ADS control module (N51)
Voltage supply
Circuit 87SA |
31 
31 |
|
 29
28 |
Ignition: ON |
11 - 14 V |
 1.1,
Model 129
W27, Figure 4
Model 140
W15, Figure 3,
Wiring.
|
| 1.1 |
|
Voltage supply from BM (N16/1) |
W27 W27
W16/1
W16/1
|
|
|
Ignition: ON
Note for test connection
Model 129
Note for test connection
Model 140 |
11 - 14 V |
Fuse (F3) on BM (N16/1),
1.1  23,
Wiring. |
| 2.0 |
|
Circuit 61 voltage |
31
|
N51
|
4
|
Ignition: ON
Engine: at Idle
|
< 1 V
11 - 14 V |
Wiring,
Generator (G2). |
| 3.0 |
|
Diagnosis ouput |
31
|
N51
|
2
|
Ignition: ON |
10 - 14 V |
Wiring,
ADS control module (N51). |
| 4.0 |
|
Front vehicle speed signal
(129 - left, 140 - right)
(from ABS or ABS/ASR control module)
|
31
|
N51
|
23
|
Raise front of vehicle.
Ignition: ON
Turn left (129) or right (140) front wheel by hand approx. 1 rotation/second
|
3 V ~ |
5.2 23 or D.M., Chassis and Drivetrain Vol. 2 section 6.2 >23,
Wiring,
ADS control module (N51). |
| 5.0 |
 |
ADS MIL (A1e27) |
31
|
N51
|
3
|
Ignition: ON
Engine: at Idle |
< 1 V
A1e27: ON
11 - 14 V
A1e27: OFF
|
Wiring,
5.1,
N51
12,
Wiring,
N51
|
| 5.1 |
|
Wiring |
31
|
N51
|
3
|
Ignition: OFF
Disconnect control
module (N51).
Ignition: ON
|
11 - 14 V |
Wiring,
A1e27 |
| 6.0 |
 |
Wheel acceleration
sensor (B24/1)
Voltage supply |
35
|
N51
|
15
|
Ignition: ON
|
4.75 - 5.25 V |
Wiring,
B24/1,
ADS control module (N51).
|
| |
|
Static sensor signal (off) |
35
|
N51
|
36
|
Ignition: ON |
2.35 - 2.65 V |
Wiring,
B24/1,
N51
|
| |
|
Dynamic sensor signal (on) |
35
|
N51
|
36
|
Vigorously move right front section of vehicle up and down by hand |
> 1 mV ~
Note:
The value changes with the movement of the vehicle. Nominal value can only be attained with digital multimeter set to mV ~.
|
B24/1,
N51 |
| 7.0 |
 |
Body acceleration
sensor (B24)
Voltage supply |
39
|
N51
|
16
|
Ignition: ON
|
4.75 - 5.25 V |
Wiring,
B24,
N51 |
| |
|
Static sensor signal (off) |
39
|
N51
|
38
|
|
2.35 - 2.65 V |
Wiring,
B24,
N51 |
| |
|
Dynamic sensor signal (on) |
39
|
N51
|
38
|
Vigorously move left front section of vehicle up and down by hand |
> 5 mV ~
Note:
The value changes with the movement of the vehicle. Nominal value can only be attained with digital multimeter set to mV ~.
|
B24,
N51 |
| 8.0 |
Model 140 only |
Vehicle load sensor (N51/1)
Voltage supply |
8
|
N51
|
6
|
Ignition: ON
|
4.75 - 5.25 V |
Wiring,
N51/1, Figure 8,
N51
|
| |
|
Static sensor signal (off) |
8
|
N51
|
7
|
Ignition: ON |
< 1.5 V |
Wiring,
N51
|
| |
|
Dynamic sensor signal (on) |
8
|
N51
|
7
|
Ignition: ON
Load trunk > 177 lbs. (80kg). |
Voltage increase > 10 mV
Note:
Voltage increase with load.
|
N51/1 |
| 9.0 |
 |
Steering angle sensor (N49)
Signal |
31
|
N51
|
1
|
Ignition: ON
|
> 3 V ~ |
Wiring,
9.1,
ADS control module (N51). |
| 9.1 |
|
Steering angle sensor |
31
|
N51
|
1
|
Ignition: OFF
Disconnect control module (N51).
Ignition: ON
|
> 3 V ~ |
Wiring,
9.2,
9.3,
N49 |
| 9.2 |
|
Voltage supply
Circuit 30a |
2 |
N49x1
|
4 |
Ignition: OFF
Disconnect connector (N49x1).
|
11 - 14 V |
Wiring. |
| 9.3 |
|
Voltage supply
Circuit 87L |
2 |
N49x1
|
3 |
Ignition: ON
|
11 - 14 V |
Wiring.
|
| 10.0 |
|
Steering angle sensor (N49)
Initialization |
|
|
|
Engine: at Idle
Turn steering wheel from right to left stop.
|
A1e27 goes out. |
9.0 |
| 11.0 |
|
Comfort/sport switch (S45/1) |
31
|
N51
|
26
|
Engine: at Idle
Hold switch S45/1 in:
Comfort setting
Release switch (neutral)
|
11 - 14 V
Indicator lamp in switch: OFF
< 1 V
Indicator lamp in switch: OFF
|
11.1,
Wiring,
ADS control module (N51).
|
| |
|
|
31
|
N51
|
25
|
Engine: at Idle
Hold switch S45/1 in:
Sport setting
Release switch (neutral)
Comfort setting (press switch briefly)
|
11 - 14 V
Indicator lamp in switch: ON
11 - 14 V
Indicator lamp in switch: ON
Indicator lamp in switch: OFF
|
Wiring,
11.1,
N51
|
| 11.1 |
|
Comfort/sport switch (S45/1)
Comfort |
28
|
N51
|
26
|
Ignition: OFF
Disconnect control
module (N51).
Hold switch S45/1 in:
Comfort setting
Release switch (neutral)
|
< 1 
> 20 k |
Wiring,
S45/1,
11.2 |
| 11.2 |
|
Comfort/sport switch (S45/1)
Sport |
28
|
N51
|
25
|
Ignition: OFF
Disconnect N51.
Hold switch S45/1 in:
Sport setting
Release switch (neutral)
|
< 1
> 20 k |
Wiring,
S45/1 |
| 12.0 |
|
Left/right rear axle damper valve assembly, rear axle solenoid valve 1 (Y53y1, Y54y1)
|
30
|
N51
|
9
|
Ignition: OFF
Disconnect control
module (N51). |
5 - 8 |
12.1,
12.2,
Wiring.
|
| 12.1 |
|
Rear axle solenoid
valve 1 (Y53y1) |
3  |
Y53x1
|
 1 |
Disconnect
connector (Y53x1).
(Figure 8 or 12)
|
10 - 16 |
Wiring,
Left rear axle damper valce assembly (Y53). |
| 12.2 |
|
Rear axle solenoid
valve 1 (Y54y1) |
3 |
Y54x1
|
1 |
Disconnect
connector (Y54x1).
(Figure 9 or 12)
|
10 - 16 |
Wiring,
Right rear axle damper valce assembly (Y54). |
| 13.0 |
|
Left/right rear axle damper valve assembly, rear axle solenoid valve 2 (Y53y2, Y54y2)
|
30
|
N51
|
10
|
Ignition: OFF
Disconnect control
module (N51). |
5 - 8 |
13.1,
13.2,
Wiring. |
| 13.1 |
|
Rear axle solenoid valve 2 (Y53y2) |
3 |
Y53x1
|
2 |
Disconnect
connector (Y53x1).
(Figure 8 or 12)
|
10 - 16 |
Wiring,
Rear axle solenoid valve 2 (Y53y2).
|
| 13.2 |
|
Rear axle solenoid valve 2 (Y54y2) |
3 |
Y54x1
|
2 |
Disconnect
connector (Y54x1).
(Figure 9 or 12)
|
10 - 16 |
Wiring,
Rear axle solenoid valve 2 (Y54y2).
|
| 14.0 |
 |
Left front axle damper valve assembly, front axle solenoid valve 1 (Y51y1) |
20
|
N51
|
21
|
Ignition: OFF
Disconnect control
module (N51). |
10 - 176 |
Wiring,
Front axle solenoid valve 1 (Y51y1). |
| 15.0 |
|
Left front axle damper valve assembly, front axle solenoid valve 2 (Y51y2) |
20
|
N51
|
19
|
Ignition: OFF
Disconnect control
module (N51). |
10 - 16 |
Wiring,
Front axle solenoid valve 2 (Y51y2). |
| 16.0 |
|
Right front axle damper valve assembly, front axle solenoid valve 1 (Y52y1) |
41
|
N51
|
22
|
Ignition: OFF
Disconnect control
module (N51). |
10 - 16 |
Wiring,
Right front axle damper valve assembly (Y52). |
| 17.0 |
|
Right front axle damper valve assembly, front axle solenoid valve 2 (Y52y2) |
41
|
N51
|
40
|
Ignition: OFF
Disconnect control
module (N51). |
10 - 16 |
Wiring,
Right front axle damper valve assembly (Y52). |
| 18.0 |
Model 129 only |
Oil level switch (S44)
Activation |
31
|
N51
|
14
|
Oil level between "MAX" and "MIN"
Ignition: ON
|
11 - 14 V |
Determine cause of leak, refill if necessary.
5.1,
ADS control module (N51).
|
| 18.1 |
|
Wiring |
31
|
N51
|
14
|
Disconnect S44.
Bridge sockets 1 and 2 on connector. |
< 1 V |
Wiring.
|
| 18.2 |
|
Internal resistance |
31
|
N51
|
14
|
Ignition: ON
Disconnect N51. |
> 20 k |
Wiring,
S44 |
| 19.0 |
|
Non-USA vehicles only,
continue to next test step. |
|
- |
|
-
|
- |
- |
| 20.0 |
|
Non-USA vehicles only,
continue to next test step. |
|
- |
|
- |
- |
- |
| 21.0 |
|
Non-USA vehicles only,
continue to next test step. |
|
- |
|
- |
- |
- |
| 22.1 |
|
Non-USA vehicles only. |
|
- |
|
- |
- |
- |
Printable version
