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Electronic control module connections

Electronic control module connections

A simple means of checking whether the control modules are operative and allow diagnostics communication (column B) is given for each control module (column A) in the table below.

If the control module is not operative, check whether it is supplied with current and grounded (columns C-E).

Then check whether the control module is connected to the bus (column F) or the data link connector (column G).

Note

Some control modules also have other supplies of current and ground connections but these are not necessary for diagnostics communication.


A

B

C1

C2

D1

D2

E

F1

F2

G

Electronic control module

Checking that the control modules allow diagnostics communication

+30

Pin

+30

Fuse

+15

Pin

+15

Fuse

Ground

Bus

(+)

Bus

(-)

K line

DICE

Intermittent wiper operation OK.

26

17

64

27

57

14

5

28 - data link connector pin 7

TWICE

Seat-belt warning lamp comes on when ignition switch turned to ON.

43

17

16

27

37

38

15

---

ACC

The display is active.

22

20

4

26

1

33

34

---

Main unit, Audio system

A CD or cassette can be loaded.

Current (+15 circuit) must also be present on pin 2 of the 26-pin female connector.

8

9

2

B

4

4

2

---

CDC

A CD magazine can be loaded.

6

9

---

---

12

8

6

---

STC



15

23

1

21

29

13

41

---

MIU

The odometer display is active.

K12:7

35

K12:1 and 6

17

K12:2

K12:5 (I-BUS)

K12:4 (P-Bus)

K12:12 (I-BUS)

K12:11 (P-Bus)

22 and 16 (Trionic and Motronic 2.10.3 immobilizer)

SID

The display is active.

15

34

8

17

1

16

9

---

PSM

The seat can be adjusted.

Current (+15 circuit) must also be present on pin 1 of the 8-pin female connector.

K1:6

25

K1:1

27

K1:7

8

6

---

Trionic

CHECK ENGINE lights up when the ignition is turned to ON.

1 and 48

28

60

17

25

---

---

33 via MIU to data link connector pin 7

Motronic 2.10.3

CHECK ENGINE lights up when the ignition is turned to ON.

18

28

27

17

L:10

P:2, 14, 24

S:19

---

---

55 via MIU to data link connector pin 7 (L lead for activation: 13 to data link connector pin 6)

EDC 15

Engine coolant temperature sensor supplied with power.

---

---

39

17

1, 2

100 (Not for diagnostics)

99

(Not for diagnostics)

35 - data link connector pin 7

Diesel pump

--

1)

--

--

--

6

2

1

---

DAH

--

1

15

---

---

2

---

---

5 - data link connector pin 7

TCM

CHECK GEARBOX lights up when the ignition is turned to ON.

18

34

17

6A

22.35

---

---

23 - data link connector pin 7

ABS

The warning lamp comes on for three seconds when the ignition switch is turned to ON.

---

1

15

26

19

---

---

11 - data link connector pin 8

SRS

The warning lamp comes on for three seconds when the ignition switch is turned to ON.

---

---

5

28

7

---

---

12 - data link connector pin 8



1) Diesel pump powered on pin 7 via relay 229.