Canon EOS 20D Service Manual page 115

Repair Information
3) Back cover tool flex
Purpose: To make the camera releasable without back cover.
Preparation: A flex end within back cover ass'y, a lead wire
Procedure:
(1) Cut approx. 5 cm of the flex end.
(2) Short-circuit No.1, No.6 and No.11 of the contact part with lead wire.
CAUTION
Cut the end of the flex.
Back cover tool flex is attached.
Be sure to use a wrist strap when starting the camera with the tool flex
attached.
Fig. 016
[1]
[6]
[11]
Fig. 018
8
Fig. 017