And these pins are good power and ground to the 4x4 module?
PINPOINT TEST B: NO COMMUNICATION WITH THE FOUR-WHEEL DRIVE (4WD) CONTROL MODULE
B1 CHECK POWER TO 4WD CONTROL MODULE
4WD Control Module C281a
4WD Control Module C281b
Measure the voltage between 4WD control module C281a, pin 1, circuit 931 (OG) and ground; and between 4WD control module C281a, pin 2, circuit 704 (DG/LG) and ground.
- Are both voltage measurements greater than 10 volts?
GO to B2.
REPAIR the power supply as necessary. TEST the system for normal operation.
B2 CHECK 4WD CONTROL MODULE GROUND CIRCUIT
Measure the resistance between 4WD control module C281a pin 7, circuit 57 (BK), harness side and ground; and between 4WD control module C281b pin 2, circuit 570 (BK/WH), harness side and ground.
- Are both resistances less than 5 ohms?
CARRY OUT the module self-test. If any DTCs are recorded, REFER to the 4WD Module Diagnostic Trouble Code (DTC) Index in this section.
If the module still does not communicate witht the diagnostic tool, Refer to section 418-00
REPAIR the circuit. TEST the system for normal operation.
Does any other module fail a network test?