Before Changing A Control Module

It is our experience that the majority of control modules returned to us for repair or replacement under warranty are in perfect working order. In these cases, fitting a new control module has obviously not cured the fault. Therefore, go through all the following points carefully before changing the control module:

1 Check all grounding points and the power supply to the control module.
2 Use the diagnostic tool to check that all test value readings are plausible (several different test values may affect a particular function).
3 Using the diagnostics tool, check that all activations work (a fault in one output circuit can affect another output circuit).





4 If the fault persists, the control module must be replaced.
5 When handling or working on control modules it is important to ground yourself first by touching the bonnet of the car. Avoid touching the control module's pins.