Test step
DTC |
Test scope
|
Test connection
|
Test condition
|
Nominal value
|
Possible cause/Remedy
|
| 1.0 |
Front seat heater control module
(N25/5)
Voltage supply
Circuit 30 |
9 
|
N25/5
|
 1
|
Ignition: OFF |
11 - 14 V |
Wiring,
Model 140 only: Combination relay module (N10/2).
|
| |
Circuit 15R |
9
|
N25/5
|
17
|
Ignition switch in position "1"
|
11 - 14 V |
|
| |
Model 140 only:
Circuit 15C |
9
|
N25/5
|
3
|
Ignition switch in position "0"
Ignition key inserted
Ignition key removed
|
11 - 14 V
0 - 1 V
|
|
| 2.0 |
Front seat heater control module
(N25/5)
Voltage supply
Circuit 58d |
9
|
N26
|
18
|
Parking lamps switched off
Parking lamps switched on |
0 - 1 V
11 - 14 V
|
Wiring. |
| 3.0 |
Left front seat heater switch
(S51/1)
Voltage supply |
9
|
N25/5
|
13
|
Ignition: ON
S51/1 Stage II held in depressed position
S51/1 Stage I held in depressed position
|
6-8 V
0 - 1 V
2 - 4 V |
3.1
N25/5. |
| 3.1 |
S51/1
Resistance |
9
|
N25/5
 |
13
|
Ignition: OFF
Disconnect test cable from N25/5.
S51/1 Stage II held in depressed position
S51/1 Stage I held in depressed position
|
>20 k
0 - 2
approx. 165 |
Wiring,
S51/1. |
4.0
Model 140 only |
Left front seat cushion heater
element (R13/1)
Left front backrest heater element (R13/2)
Voltage supply |
9
19
|
|
8
8
|
Ignition: ON.
Left front seat heater switch
(S51/1) Stage II switched on |
0 - 1 V
9 - 14 V
9 - 14 V
|
4.1
N25/5 |
| |
|
9
9
|
|
8
19
|
S51/1 Stage I switched on |
9 - 14 V
9 - 14 V |
|
| 4.1 |
Resistance |
19
19
|
|
8
9
|
Ignition: OFF.
Disconnect test cable from N25/5
Leather upholstery
Leather upholstery
|
2.0 - 3.0
2.0 - 3.0
|
Wiring,
R13/1,
R13/2. |
5.0
Model 140 only |
Right front seat cushion heater
element (R13/3)
Right front backrest heater element (R13/4)
Voltage supply |
9
4
|
|
2
2
|
Ignition: ON
Right front seat heater switch (S51/2) Stage II switched on |
0 - 1 V
9 - 14 V
9 - 14 V
|
5.1
N25/5. |
| |
|
9
9
|
|
2
4
|
S51/2 Stage I switched on |
9 - 14 V
9 - 14 V |
|
| 5.1 |
Resistance |
2
9
|
|
4
4
|
Ignition: OFF
Disconnect test cable from N25/5
Leather upholstery
Leather upholstery
|
2.0 - 3.0
2.0 - 3.0
|
Wiring,
R13/3,
R13/4. |
6.0
Model 202 only |
Left front seat cushion heater
element (R13/1)
Left front backrest heater element (R13/2)
Voltage supply |
9
|
N25/5
|
8
|
Ignition: ON
Left front seat heater switch
(S51/1) Stage II switched on
S51/1 Stage I switched on
|
0 - 1 V
9 - 14 V
Intermittent display on Multimeter
|
6.1
N25/5. |
| 6.1 |
R13/1, R13/2
Resistance |
9
|
N25/5
|
8
|
Ignition: OFF
Disconnect test cable from N25/5
|
1.6 - 2.3 |
Wiring,
R13/1,
R13/2. |
| 7.0 |
Left front seat heater switch
(S51/1), lighting
Voltage supply |
6
|
S51/1
|
5
|
S51/1 connector pulled off.
Parking lamps switched on. |
11 - 14 V |
Wiring. |
| 8.0 |
Left front seat heater switch
(S51/1), indicator lamps
Voltage supply |
9
|
N25/5
|
12
|
Ignition: ON
S51/1 Stage I switched on
S51/1 Stage II switched on
|
0 - 1 V
8 - 13 V
8 - 13 V |
Wiring,
S51/1,
N25/5. |
| |
|
9
|
N25/5
|
20
|
S51/1 Stage I switched on
S51/1 Stage II switched on
|
0 - 1 V
8 - 13 V
|
|
| 9.0 |
Left front seat heater switch
(S51/1), dimming
Voltage supply |
9
|
N25/5
|
12
|
Ignition: ON
S51/1 Stage I switched on
Parking lamps switched on
|
0 - 1 V
8 - 13 V
2.0 - 2.8 V
|
Wiring,
S51/1,
N25/5. |
| |
|
9
|
N25/5
|
20
|
Parking lamps switched off.
S51/1 Stage II switched on
Parking lamps switched on
|
8 - 13 V
2.0 - 2.8 V
|
|
| 10.0 |
Left front seat heater switch
(S51/2)
Voltage supply |
9
|
N25/5
|
11
|
Ignition: ON
S51/2 Stage II held in depressed position
S51/2 Stage I held in depressed position
|
6 - 8 V
0 - 1 V
2 - 4 V |
10.1
N25/5. |
| 10.1 |
S51/2
Resistance |
9
|
N25/5
|
11
|
Ignition: OFF
Disconnect test cable from N25/5
S51/2 Stage II held in depressed position
S51/2 Stage I held in depressed position
|
>20 k
0 - 2
approx. 165 |
Wiring,
S51/2. |
11.0
Model 202 only |
Right front seat cushion heater
element (R13/3)
Right front backrest heater element (R13/4)
Voltage supply |
9
|
N25/5
|
2
|
Ignition: ON
Left front seat heater switch
(S51/2) Stage II switched on
S51/2 Stage I switched on
|
0 - 1 V
9 - 14 V
Intermittent display on Multimeter
|
11.1
N25/5. |
| 11.1 |
R13/3, R13/4
Resistance |
9
|
N25/5
|
2
|
Ignition: OFF
Disconnect test cable from N25/5
|
1.6 - 2.3
|
Wiring,
R13/3,
R13/4. |
| 12.0 |
Right front seat heater switch
(S51/2), lighting
Voltage supply
|
6
|
S51/2
|
5
|
S51/2 connector pulled off
Parking lamps switched on |
11 - 14 V |
Wiring. |
| 13.0 |
Right front seat heater switch
(S51/2), indicator lamps
Voltage supply |
9
|
N25/5
|
5
|
Ignition: ON
S51/1 Stage I switched on
S51/1 Stage II switched on
|
0 - 1 V
8 - 13 V
8 - 13 V |
Wiring,
S51/2,
N25/5. |
| |
|
9
|
N25/5
|
10
|
S51/1 Stage I switched on
S51/1 Stage II switched on
|
0 - 1 V
8 - 13 V
|
|
| 14.0 |
Right front seat heater switch
(S51/2), dimming
Voltage supply |
9
|
N25/5
|
5
|
Ignition: ON
S51/2 Stage I switched on
Parking lamps switched on
|
0 - 1 V
8 - 13 V
2.0 - 2.8 V
|
Wiring,
S51/2,
N25/5. |
| |
|
9
|
N25/5
|
10
|
Parking lamps switched off
S51/2 Stage II switched on
Parking lamps switched on
|
8 - 13 V
2.0 - 2.8 V
|
|
15.0
Only model 140 with 8 or 12 cylinder engine |
Idle rpm increase with seat heater
operating in stage II |
|
V2
|
2
|
Pull off connector (2) from engine
rpm increase diode matrix (V2)0.
Seat heater stage II switched on. |
11 - 14 V
|
Wiring,
N25/5,
3.0 or 10.0 respectively.
Values O.K.:
Diagnostic Manual Engines Vol. 3 6.2 or 6.3 Electronic Accelerator, Engine
rpm increase diode matrix test
|
Printable
version
