Jimenez, the first-round leader and four-time winner this season, carded a 4-under 67 and stands at 10-under-par 132. Luke Donald, who will join Garcia and Jimenez on the European Ryder Cup squad, is two shots back at minus-8 after a 67. He is joined there by Charl Schwartzel, who shot 66.
Garcia began on the back nine of the Alpine Course at Golf Club Crans-sur- Sierre. The Spaniard dropped a stroke at the par-3 11th and tripped to another bogey at the 16th. However, he picked up his first birdie in between on the par-5 14th.
The 24-year-old dropped in back-to-back birdies from the 17th to make the turn at minus-6. Garcia made it three straight as he birdied the par-5 first hole.
Garcia turned it on down the stretch. He rolled in a 6-foot birdie try at the sixth and came back with a two-putt birdie at the short par-4 seventh.
The four-time winner on the European Tour made it three straight when he rolled home a 35-footer for birdie at No. 8. At the par-5 ninth, his last, Garcia knocked his second shot into a greenside bunker. He then blasted out to two feet and kicked that in for birdie to move to 11 under.
'I hit some draws too, but I am feeling more comfortable hitting fades,' said Garcia. 'I feel I can control it better and my misses are better than my draws. Every time I try to hit a fade and miss the fairway I miss it by two or three yards. Just off the fairway. That is nice. I just have a lot more confidence on that shot than I used to.'
Jimenez was hot early on to remain in contention. He birdied the first for the second straight day and came back with a birdie at the par-3 third. The Spaniard moved to 10 under with back-to-back birdies from the sixth.
The 11-time winner on the European Tour then stumbled to his first bogey of the event at the par-3 eighth. He atoned for that mistake with a birdie at the 11th.
Jimenez joined Garcia in the lead as he rolled in a 20-footer for birdie at the 14th. However, he flew his second shot over the 17th green and was unable to save par. He two-putted from outside 50 feet for par at the last to remain one shot behind his countryman.
'I know it is a lot of golf, but if I go home I know I won't practice because when I go home I want to rest,' said Jimenez of his plans to play next week prior to the Ryder Cup. 'I don't want to be away from the clubs. I will have a week off after the Ryder Cup. If I go home I don't want to practice at all. That is no good before the Ryder Cup because you need to keep the short game and the feeling on the game.'
Eduardo Romero posted a 4-under 67, while Peter Fowler carded a 3-under 68 to move into a share of fifth place at 7-under-par 135.
Defending champion Ernie Els posted a 4-under 67 on Friday. He is tied for ninth place at 6-under-par 136 with Graeme McDowell, Simon Dyson, Craig Spence, Roger Chapman, Carlos Rodiles, Marc Farry and Darren Fichardt.
The cut line fell at 1-over-par 143 with 79 players moving on to the final two rounds. Among those missing out on the weekend were Emanuele Canonica (144), Andrew Coltart (145), Barry Lane (146) and Costantino Rocca (148).