S77 Transfer Case Shift Control Switch

WARNING: This page is about a different variant/trim than selected.

Ignition OFF. Remove the S77 transfer case shift control switch. Refer to Transfer Case Selector Switch Replacement (Chevrolet/GMC) Transfer Case Selector Switch Replacement (Cadillac) .
Measure the resistance for each of the range positions of the S77 transfer case shift control switch between the 5-volt reference circuit, terminal 11 and the switch signal circuit terminal 12.
NOTE: Testing for Step 2 is performed on the component using the L-BU probe J 35616-65B.
- If the resistance is outside the specified ranges
  Replace the S77 transfer case shift control switch. Refer to Transfer Case Selector Switch Replacement (Chevrolet/GMC) Transfer Case Selector Switch Replacement (Cadillac) .
- Go to next step: If the resistance is within the specified ranges
S77 transfer case shift control switch OK.

S77 Transfer Case Range Selection Switch	Range	Nominal
2WD	1475 - 1550 Ω	1515 Ω
4WD/AWD Automatic	110 - 175 Ω	140 Ω
4WD High/Locked	625 - 700 Ω	665 Ω
4WD Low	2230 - 2400 Ω	2345 Ω
Neutral	990-1050 Ω	1020 Ω