Diagnostic Mode

To enter diagnostic mode, the instrument pack must first be in normal or standby normal mode and T4 scan tool or another diagnostic tool must be connected to the diagnostic socket. The instrument pack will enter diagnostic mode when it receives a valid message on the ISO 9141 K Line. Confirmation of access to this mode is given by a "dIAg" message in the LCD.

Diagnostic mode is exited by receipt of a message from the diagnostic tool to terminate diagnostics. Removal of the ignition switch position II battery supply or disconnection of the diagnostic communication to the socket will also terminate the diagnostic mode.