Test H: The 4WD Indicator Does Not Operate Correctly
Pinpoint Test H: The 4WD Indicator Does Not Operate CorrectlyNormal Operation
The 4WD control module communicates with the instrument cluster through the high speed CAN. The instrument cluster illuminates the 4WD indicator when as requested by the 4WD control module. Problems with either the high speed CAN or the instrument cluster can effect 4WD operation.
4WD - Illuminates continuously when the 4WD system is locked into permanent 4-wheel drive due to heat protection mode. In the locked mode the vehicle resists turning and binds up when driven on dry pavement. To exit the locked mode, stop the vehicle and allow it to cool. When the 4WD indicator turns OFF, normal 4WD system function is restored.
4WD - Blinks continuously when the 4WD system is disabled due to its heat protection mode. To exit the disabled mode, stop the vehicle and allow it to cool. When the indicator turns OFF, normal 4WD system function is restored.
4WD - Blinks 3, 6, 8 or 10 times every minute when the 4WD system requires service. Use a diagnostic tool to check for DTCs. Refer to the Four-Wheel Drive (4WD) Control Module Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
H1-H3:
H3-H6:
H7-H8:
NOTE: Conduct Steps 1 through 7 outlined in Inspection and Verification prior to performing this test.
Possible Causes
^ SJB fuse(s) 18 (10A), 35 (5A)
^ 4WD control module
^ Instrument cluster
^ Circuitry