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

Pinpoint Test A: No Communication With the 4x4 Module (PCM)





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

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 1524 (DB).

Possible Causes
^ Power supply:
- circuit 1524 (DB)
^ Power distribution junction box (PDJB) mini-fuses:
- 30 (25A)
^ Charging system.
^ Battery.