Test Mode No. 1 (Displaying Codes)

To retrieve codes, open Volvo diagnostic unit cover (located in right corner of engine compartment) and connect test lead to socket No. 2. Turn ignition on. Enter test mode No. 1 by pressing test button once for 1-3 seconds.
Observe LED, and count number of flashes in 3 digit series comprising a fault code. Because series are displayed at 3-second intervals, codes can be easily distinguished.
If a fault code is retrieved, refer to the TROUBLE CODE DEFINITION table under TROUBLE CODE IDENTIFICATION. Depress push button again, and check for additional codes. Depress push button a third time if necessary. If first code repeats, no other codes are present.