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

Normal Operation 

In order for the 4x4 module (PCM) to communicate with the scan tool, the operating voltage required to supply the 4WD module is in a range between 9 and 16 volts. Voltage is supplied by circuit 729 (RD/WH) and circuit 994 (WH).

Possible Causes 

• CAN communication
• scan tool
• battery junction box (BJB) fuse 18 (20A)
• central junction box (CJB) fuse 24 (15A)
• power supply:
  • circuit 729 (RD/WH)
  • circuit 994 (WH)
• ground circuits:
  • circuit 570a (BK/WH)
  • circuit 570b (BK/WH)
  • 570c (BK/WH)
• 4x4 module (PCM)
• charging system