Test A: No Communication With the 4X4 Module (PCM)

Pinpoint Test A: No Communication With the 4x4 Module (PCM)
Refer to Vehicle/Diagrams.

Normal Operation
In order for the 4x4 module (PCM) to communicate with the diagnostic tool, the operating voltage required to supply the 4x4 module (PCM) is in a range between 9 and 16 volts. Voltage is supplied by circuit 1861 (RD) and circuit 1865(WH/OG)

Possible Causes
^ Power supply: circuit 1861 (RD), circuit 1865 (WH/OG)
^ Power distribution junction box (PDJB) mini-fuses: 20 (15A), 29 (15A)
^ Charging system
^ Battery

Test A1-A2:

Test A3-A7:

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.