4WD Indicator Always On

4WD Indicator Always On

Circuit Description
The 4WD indicator lamp is located in the instrument cluster. Ignition 1 voltage is supplied to the instrument panel cluster (IPC) when the ignition switch is in the START or RUN position. When the vehicle is in START or RUN and the powertrain control module (PCM) receives the axle switch signal from the front axle actuator, the PCM sends a class 2 signal to the instrument cluster turning on the 4WD indicator. The 4WD indicator will stay on as long as the axle switch signal input is present.

Test Description

Step 1 - Step 9:

The numbers below refer to the step numbers on the diagnostic table.
2. Tests for an intermittent condition.
3. Determines whether the failure is the result of a faulty 4WD system.
4. Determines if the failure is the result of a faulty instrument cluster.
5. Determines if the failure is the result of a faulty PCM.