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.
ELECTRONIC CONTROL MODULE CONNECTIONS TECHNICAL DATA
| 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 | 35 | 64 | 17 | 57 | 14 | 5 | 28 - link connector pin 7 |
| TWICE | Seat-belt warning lamp comes on when ignition switch turned to ON. | 43 | 35 | 16 | 17 | 37 | 38 | 15 | - |
| ACC | The display is active. | 22 | 27 | 4 | 9 | 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. |
A7 | 13 | A4 | 24 | A8 | C4 | C2 | - |
| CDC | A CD magazine can be loaded. | 6 | 13 | - | - | 12 | 11 | 5 | - |
| STC | - | 15 | 23 | 1 | 21 | 29 | 13 | 41 | - |
| MIU | The odometer display is active. | 1 | 35 | 2 | 17 | 18 | 8 (I-bus) 17 (P-bus) |
16 (I-bus) 9 (P-bus) |
- |
| 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 | LHD:16 RHD: 5 |
K1:1 | 17 | K1:7 | 4 | 8 | - |
| Trionic T7 | The fuel pump runs for one second when the ignition switch is turned to ON. | 23 | 17 | 43 | 27 | 25 and 47 | 66 | 19 | - |
| DAH | - | 1 | 15 | - | - | 2 | - | - | 5 - data link connector pin 7 |
| PSG 16 | Engine coolant temperature sensor supplied with power. | - | - | K16 | 17 | K29 | - | K17 | K6-link connector pin |
| TCM, cars with Trionic T7 engine management system | CHECK GEARBOX lights up when the ignition is turned to ON. | 16 | 34 | 1 | 6A | 32.31 | 9 | 10 | - |
| ABS | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | 17.18 | M2 | 15 | 19 | 16.19 | - | - | 11 link connector pin |
| TC/ABS | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | 17.18 | M2 | 15 | 19 | 16.19 | - | - | 11 - data link connector pin |
| SRS | The warning lamp comes on for three seconds when the ignition switch is turned to ON. | - | - | 5 | 18 | 7 | - | - | 12 - data link connector pin |