Description of On-Board Diagnostics

Diagnostic system, general






There are two diagnostic outputs, A and B. They are located in the engine compartment behind the RH headlight.






We recommend use of the Volvo Diagnostic Key (Scan tool) when using the diagnostic system, particularly for calibration, as this makes the work much easier. Manual calibration involves go keypresses and acknowledgements.

The diagnostic system covers the following two test modes:

Test mode 1 for reading stored faults. The control module can register 19 different faults, but only retains a record of the last two. After a repair, it is therefore especially important to clear the Diagnostic Trouble Codes (DTC), activate the seat and see whether there are any other faults. Diagnostic Trouble Codes (DTC) are displayed one at a time in the normal way when the button is pressed. The codes are held in a non-volatile memory, ie one that retains data even if the battery power fails. When all the Diagnostic Trouble Codes (DTC) have been read off, they should be deleted in the normal way.

Test mode 4 for calibration of the system and for changing the transmission rate, in particular when fault tracing with the Volvo Diagnostic Key.

The power seat will need to be recalibrated if any of the following components has been replaced: control module, drive gear, any of the motors, position potentiometer, wire or slide rail.

Note: If the seat does not work when a button is pressed, or if the diagnostic system cannot be accessed, check that none of the buttons on the seat controls has become stuck in the "pressed" position.

Note: If the diagnostic system cannot be accessed, or if the system crashes, try doing the procedure with the engine running. The battery voltage must be within certain limits for the diagnostic system to work.

Note: Before the diagnostic system is restarted, the ignition must have been off for at least five seconds, otherwise the diagnostic system will not start.