Before Changing A Control Module

Fig 1: Illustration For Steps 2-4

Courtesy of SAAB-SCANIA OF AMERICA, INC.

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 whether the problem can be solved with a control module software update (for control modules that can be reprogrammed).
   IMPORTANT: Avoid SPS programming unless it is absolutely necessary. It is extremely important to follow the instructions for SPS programming to avoid damaging the control module.
2. Check all grounding points and the power supply to the control module.
3. Check with a diagnostic tool that all the readings are plausible (several readings can affect one function).
4. Check with the diagnostics tool that all activations function normally. (Malfunction in one output circuit can affect another output circuit).
5. If the fault persists, the control module must be changed.
   Fig 2: Illustration For Step 6

   Courtesy of SAAB-SCANIA OF AMERICA, INC.
6. Control modules are sensitive to electrostatic discharges. Great care must be taken to follow the following procedure to avoid damaging internal components in the control module:
   • Keep the control module in its packaging for as long as possible.
   • Never touch the pins of a control module with your hands or clothing  .
   • Ground yourself by touching part of the car's body/engine. Unplug the connector from the car's control module.
   • Place the exchanged control module in its return packaging without touching the pins.
   • Ground yourself by touching part of the car's body/engine. Plug in the connector to the car's control module.