Enable Write Access

Procedure

1. Locate the x20 Diagnostic Link Connector near the RH strut tower in the engine bay and unscrew the cover.

2. Depending on your vehicle, do the following:

OBD2 port & x20 Diag Connector (Female):

-Connect Pin 14 to Pin 18 to put the ECU in Write mode

-Connect Pin 2 to Pin 17 to bridge the OBD2 port in the car to the ECU which enables flashing via obd2 port inside the car

x20 Diag Connector only (male):

-Open 20 pin adapter and internally connect pin 14 to pin 18 to enable Write mode

Note: pin numbers should be printed next to each pin in very small text.

2a. Example picture of a temporary method when both x20 Diag Connector and OBD2 port are available.

3. Turn the ignition on, and use MS41 Quickflash to read/write the ECU.

Alternatively, e36s equipped with an obd2 port in the car can purchase a jumper plug to painlessly enable flashing from inside the car at https://www.msportparts.com/collections/electronics/products/msp-e36-ms41-pnp-write-access-ecu-programming-plug-in-obd2-only

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