On earlier production vehicles when replacing a control module that stores the ZCS code (i.e Kombi/Instrument Cluster) the information must be entered manually in order to code the replacement module. The ZCS code from the label located in the vehicle or a printout of the code stored in the module to be replaced must be entered into the new module.

The control modules that store the ZCS and require manual input are:

IKE - E38
EKM - E31
Instrument Cluster - E32/34 (After 9-91) & E36 (except 318ti and Z3 Roadster)
EWS II - 318ti & Z3 Roadster

NOTE: As long as the defective EWS II control module can communicate with the coding equipment, automatic encoding is possible.

On later production vehicles where the ZCS information is stored in two modules, redundant data storage, the ZCS information to code the replacement module can be obtained from the second/backup module.

Vehicles which have redundant ZCS data storage are:

E36 (Z3) - Instrument Cluster & EWS II as of 9/98
E39 - Instrument Cluster & EWS II
E46 - Instrument Cluster & LSZ
E53 - Instrument Cluster & LSZ

NOTE: E46 changed from ZCS to a Vehicle Order (VO/FA) vehicle data structure in 9/01.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Coding Control Modules That Store The ZCS: Notes

Use the Manual With the Right Hardware

When to See a Mechanic

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