Astra G Simtec 70 EEPROM read

European GM ECUs and PCMs
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Location: Doonside, NSW

Astra G Simtec 70 EEPROM read

Postby Argosy » Sat Feb 10, 2018 8:47 pm


I have an Opel Astra G series 1 (1998) with a Siemens Simtec 70 ECU. I am trying to write a C# program using KWP2000 commands and the ELM327 device to read the EEPROM to extract the 4 digit pin code. The commands to start the diagnostic session and seed/key commands work ok, however when I attempt to read memory, it returns an undocumented error:

Start Diagnostic Session: 0x10 81, returns 0x50 (success)

Request Seed: 0x27 01, returns 0x67 01 D1 C3 (success)

Send Key: 0x27 02 9B E5, returns 0x 67 02 34 (success, security access allowed)

Read Memory By Address: 0x23 10 00 00 02 (0x 10 00 = memory address, 0x00 02 = bytes to read), returns 7F 23 52, (7F = negative response, 23 = command sent, 52 = ?).

My information for the KWP2000 commands is from the document “General Motors Local Area Network Enhanced Diagnostic Test Mode Specification (GMW3110)”, where it states that start address can be 2, 3 or 4 bytes. I have tried sending 2, 3 and 4 byte length start addresses, but they all fail. Does anyone have any idea what the problem could be? Thanks.

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