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 power supplies and ground connections, but they are not necessary for diagnostics communication.
TECHNICAL DATA - ELECTRONIC CONTROL MODULE CONNECTIONS
| A | B | C1 | C2 | D1 | D2 | E | F1 | F2 | G |
|---|---|---|---|---|---|---|---|---|---|
| Control module | Checking that the control modules allow diagnostics communication | +30 Pin | +30 Fuse | +15 Pin | +15 Fuse | Ground | Bus (+) | Bus (-) | K-lead |
| 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 | - |
| Infotainment head unit | A CD can be loaded. Current (+15 circuit) must also be present on pin 2 of the 26-pin female connector. |
8 | 9 | 2 | 21 | 4 | 18 | 17 | - |
| CDC | A CD magazine can be loaded. | 6 | 9 | - | - | 12 | 11 | 5 | - |
| PMM | The potentiometers are supplied with 5 V. Current (+15 circuit) must also be present on pin 2 of the 20-pin female connector. |
1 | 11 | 2 | 27 | 8 | 19 | 20 | - |
| MIU | The odometer display is active. | 1 | 17 | 2 | 27 | 18 | 8 (I-bus) 17 (P-bus) |
16 (I-bus) 9 (P-bus) |
- |
| SID | The display is active. | 1 | 8 | 28 | 27 | 32 | 30 | 31 | - |
| 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 | K1:8 | K1:4 | - |
| Trionic | The fuel pump runs for one second when the ignition switch is turned to ON. | 23 | 17 | 43 | 27 | 25 and 47 | 66 | 19 | - |
| Diesel V6 | The fuel pump runs for one second when the ignition switch is turned to ON. | 24 | 27 | 4 and 5 | 67 | 48 | - | ||
| Diesel 4-cyl | Coolant temperature sensor supplied with power. | K16 | 27 | K50, K52, K54, K56 | K29 | K17 | K6 - data link connector pin 7 |
||
| TCM | The oil temperature sensor is supplied with about 5 V. | 33 | 12 | 31, 22 | B | 32, 23 | 25 | 26 | - |
| SRS | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | - | - | 51 | 28 | 52 | 55 | 56 | |
| ABS | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | 17, 18 | 2 | 15 | 29 | 19 | - | - | 11 - data link connector, pin 8 |
| TC/ABS | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | 17, 18 | 2 | 15 | 29 | 19 | 30 | 29 | 11 - data link connector, pin 8 |
| ESP | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | 17, 18 | 2 | 15 | 29 | 19 | 30 | 29 | 11 - data link connector, pin 8 |
| SPA | Check:
|
2(A) | 8(A) | 1(A) | 26(A) | 3(A) | 4(A) | 5(A) | - |
| Headlamps, xenon light system | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | - | - | 10 | 21 | 1 | - | - | 9 - data link connector, pin 8 |
| DAH | - | 1 | 5 | - | - | 2 | - | - | 5 - data link connector pin 8 |