Replacing ECM

WARNING: This page is about a different car, the 2007 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

Before "Add" ECM:

Fig 1 : ECM with a previously programmed master key code, illustrated here in orange.

Fig 1: Identifying ECM With Master Key (Orange)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

During "Add" ECM:

It does not matter if the ECM unit is new (in transport mode) or used (previously "added" or "removed").

When "Add" ECM is carried out using Tech2, the master key code is copied from CIM to ECM.
The keys that worked previously will still be functional.

After "Add" ECM:

Fig 2 : The illustration shows the same ECM as in figure 8, but with the master key code copied from CIM, illustrated here in green.

Fig 2: Identifying CIM With Master Key (Green)

Courtesy of SAAB-SCANIA OF AMERICA, INC.