2004 Toyota Sienna Navigation Manual - Page 351
2004 Toyota Sienna Manual
Page 351 highlights
04 SIENNA_U (L/O 0408) If the indicator or buzzer comes on... Do this. Check the condition according to the warning code. If the system malfunctions, contact Toyota dealer. (o) Dynamic laser cruise control master warning light (p) Key reminder buzzer Remove key. 169 2004 SIENNA from Aug. '04 Prod. (OM45422U)