Were you sent here from Electric Shift System Functional Test?

Go to Step 2

Refer to Electric Shift Transfer Case Functional Test

Did any of the three shift select buttons blink once?

Go to Step 3

Refer to All Shift Select Buttons Do Not Light

Did one of the shift select buttons stay lit in order to indicate the transfer case shift position?

Go to Step 4

Go to Step 5

Does the transfer case mode shift between 4HI and 2HI?

Go to Step 5

Go to Step 6

1. Position the ignition switch to RUN.
2. Position the transmission to neutral.
3. Push the vehicle forward about five feet.

Does the transfer case mode shift between 4HI and 2HI?

Refer to transfer case mechanical diagnosis.

Refer to Reduced or No Mode and Range Shift Operation

Does more that one shift select button stay lit?

Refer to More Than One Shift Select Button Remains Lit

Refer to Reduced or No Mode and Range Shift Operation

1. Apply the park brake.
2. For automatic transmissions, place the transmission shift select in PARK.
3. For manual transmissions, shift the transmission into first gear.
4. Position the ignition switch to RUN.
5. Press the 4LO transfer case shift select button.

Does the 4LO shift select button blink for 30 seconds?

Go to Step 8

Go to Step 9

1. Position the ignition switch to RUN.
2. Press the 4LO transfer case shift select button and note the blinking.
3. For automatic transmissions, position the transmission shift select to neutral.
4. For manual transmissions, push the clutch pedal to the floor panel.

Does the 4LO shift select button stop blinking and stay lit when the transmission is shifted to neutral (automatic transmissions) or when the clutch pedal is pushed in (manual transmissions)?

Refer to Perform a Diagnostic On the TCCM

Refer to Reduced or No Mode and Range Shift Operation

Does the transfer case range shift to 4LO?

Refer to All Shift Select Buttons Remain Lit

Refer to Reduced or No Mode and Range Shift Operation