Before Changing A Control Module

Experience has shown that most control modules returned under warranty are not faulty. Consequently, changing the control module has not rectified the fault in these cases. Therefore, go through the following points before replacing a control module:
1 Check all grounding points and the power supply to the control module.
2 Check with a diagnostic tool that all the readings are plausible (several readings can affect one function).
3 Check with a diagnostic tool that all the activations are working (one defective output circuit can affect another output circuit).
4 If the fault persists, the control module must be replaced.







5 It is important that you first ground yourself by touching the car bonnet before handling a control module. Avoid touching the control module pins.