Fault 2 / Fault Code 12

2: Lateral acceleration sensor Short-circuit / Break in circuit Fault code - 12 -

Possible Causes, Elimination, Remarks

Wiring between control unit and lateral acceleration sensor not in working order (break, short to positive side or to earth/ground), or the lateral acceleration sensor itself is damaged.

The following wiring is installed:

- Power supply to sensor (5 Volt) = PIN 15 at control unit - PIN 3 at sensor

- Earth/ground for sensor = PIN 9 at control unit - PIN 1 at sensor

- Signal from sensor to control unit (2,7 +- 0.14 Volt with car in normal-load position) PIN 34 at control unit - PIN 2 at sensor

The PIN data for the sensor plug can be seen on top of the plug after pushing back the protective sleeve.

1. Check power supply (app rox. 5 Volt) at the sensor plug (black plug housing) after detaching it, with the ignition switched on. PIN 1 (-) and PIN 3 (+).




Note
There is a cover on the right side of the center console. The sensors can be reached after removing this cover.
1 = Lateral acceleration sensor
2 = Front-rear acceleration sensor

2. Check for break in circuit or short to earth/ground at the wire between PIN 2 at the sensor plug and PIN 34 at the control unit plug after this has been detached.





3. Connect the plug to the sensor. Check the installed position of the sensor and its function by testing the output signal. To make this check, connect the 55-pin ABS 2-LED adapter wire to the control unit plug. Connect the multimeter to sockets B and C.