GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Lucerne 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Control Valve Lower Body Disassemble

    Object Number: 1580428 Size: SH
  1. Use a small screwdriver in order to disconnect the electrical connectors from the following parts:
    2. • 1-2 shift solenoid valve (909)
    • 2-3 shift solenoid valve (910)
    • Internal mode switch (IMS) (942)

    Object Number: 1580429 Size: SH
  2. Remove the 3, 10 mm bolts (534) from the channel plate side.
  3. Remove the 6, 10 mm bolts (534, 951, 952, 954) from the accumulator housing.

    4. Note: There are 4 checkballs (65) and a spring (971) under the accumulator housing (944).

  4. Remove the accumulator housing (944) from the channel plate.

    5. Object Number: 1580432 Size: SH
  5. Remove the 4 checkballs (65) and the spring (971) from the channel plate.

    6. Object Number: 1580433 Size: SH
  6. In order to disconnect the manual valve and link assembly (916) from the internal mode switch (IMS) (942), rotate the manual valve and link assembly (916) toward the IMS (942).

    7. Object Number: 1580437 Size: SH
  7. Turn the manual valve link 90 degrees and rotate the manual valve and link assembly (916) away from the IMS (942).

    8. Object Number: 1580439 Size: SH
  8. Remove the 3, 8 mm bolts (939) from the internal mode switch (IMS) (942).
  9. Remove the IMS (942).

    10. Object Number: 1217566 Size: SH
  10. Remove the 15, 10 mm bolts (938, 940, 941) from the lower control valve body.
  11. Remove the solenoid valve fluid filter retainer (981).
  12. Remove the lower control valve assembly (903) from the channel plate.

    13. Object Number: 509660 Size: SH
  13. Remove the 4 checkballs (65).
  14. Remove the spacer plate and gasket assembly (935) from the channel plate (900).