What fuse powers the transfer case shift control / 4WD circuit?

The 4WD fuse, rated 15 A, located in the I/P fuse block. It is hot in RUN and feeds the circuit on 0.5 BRN wire, circuit 241.

What wire colors and circuit numbers are used for the propshaft speed sensors?

Front sensor: 0.5 PPL circuit 401 (signal low) and 0.5 YEL circuit 400 (signal high). Rear sensor: 0.5 DK GRN circuit 2222 (signal low) and 0.5 LT BLU circuit 2221 (signal high), all passing through connector C151.

How does the front axle actuator get power and ground?

Power arrives on 0.5 BRN circuit 241 at pin C via connectors P100, C100, C153, and C150. Ground exits pin E on 0.5 BLK circuit 2150, becoming 0.8 BLK 2150 after connector C150, terminating at ground G110.

What are the connector IDs on the transfer case shift control module?

Per the CONN ID legend: C1 = 16-way BLK, C2 = 16-way GRY, C3 = 4-way BLK.

What circuit carries the axle actuator control signal?

0.5 LT BLU circuit 1296, from module pin A2 (connector C1) through P100, C151 pin C, and C150 pin B to the front axle actuator pin B. The axle switch signal uses 0.5 BLK/WHT circuit 1695.

Home/ Registry/ Chevrolet/ Tahoe/ 2000-2006/ 2004 Chevrolet Tahoe/ Photo supermotors.net/registry/media/900258

Chevy Tahoe Transfer Case Shift Control Module Wiring Diagram - 4WD Actuator

1995 Ford Bronco 4WD transfer case shift control module wiring with propshaft speed sensors

‹ ›

Wiring schematic for the electronic 4WD transfer case shift control module, front/rear propshaft speed sensors, and front axle actuator solenoid coils with circuit/wire-color IDs.

AI caption December 2011 · Photo 12 of 15

This document is a factory-style wiring schematic for the Transfer Case Shift Control Module circuit of a GM 4WD truck/SUV, uploaded as applying to a 2004 Chevrolet Tahoe. It shows the module's connections (connectors C1 = 16-way black, C2 = 16-way gray, C3 = 4-way black) to the front and rear propshaft speed sensors, the front axle actuator, and the transfer case shift control switch. Power comes from the 4WD 15 A fuse in the I/P fuse block, hot in RUN, delivered on 0.5 BRN circuit 241 through connectors P100, C100, C153, and C150. Speed sensor signal circuits are 0.5 PPL 401 and 0.5 YEL 400 (front) and 0.5 DK GRN 2222 and 0.5 LT BLU 2221 (rear), routed through connector C151 as twisted pairs. The axle switch signal uses 0.5 BLK/WHT circuit 1695 and the axle actuator control uses 0.5 LT BLU circuit 1296. The front axle actuator contains internal switching contacts, coils, a motor, and solid-state circuitry, grounding through 0.5/0.8 BLK circuit 2150 at ground G110. A reader can identify wire colors, gauges, circuit numbers, connector pin assignments, and power/ground paths for diagnosing 4WD engagement, axle actuator, or speed sensor faults.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What fuse powers the transfer case shift control / 4WD circuit?: The 4WD fuse, rated 15 A, located in the I/P fuse block. It is hot in RUN and feeds the circuit on 0.5 BRN wire, circuit 241.
What wire colors and circuit numbers are used for the propshaft speed sensors?: Front sensor: 0.5 PPL circuit 401 (signal low) and 0.5 YEL circuit 400 (signal high). Rear sensor: 0.5 DK GRN circuit 2222 (signal low) and 0.5 LT BLU circuit 2221 (signal high), all passing through connector C151.
How does the front axle actuator get power and ground?: Power arrives on 0.5 BRN circuit 241 at pin C via connectors P100, C100, C153, and C150. Ground exits pin E on 0.5 BLK circuit 2150, becoming 0.8 BLK 2150 after connector C150, terminating at ground G110.
What are the connector IDs on the transfer case shift control module?: Per the CONN ID legend: C1 = 16-way BLK, C2 = 16-way GRY, C3 = 4-way BLK.
What circuit carries the axle actuator control signal?: 0.5 LT BLU circuit 1296, from module pin A2 (connector C1) through P100, C151 pin C, and C150 pin B to the front axle actuator pin B. The axle switch signal uses 0.5 BLK/WHT circuit 1695.