Test G: No Communication With The Four Wheel Drive (4WD) Control Module

PINPOINT TEST G: NO COMMUNICATION WITH THE FOUR WHEEL DRIVE (4WD) CONTROL MODULE

Refer to Vehicle/Diagrams, Four-Wheel Drive System for schematic and connector information.

Normal Operation
In order for the four wheel drive (4WD) control module to communicate with the scan tool, the operating voltage required to supply the 4WD control module is in a range between 9 and 16 volts. Voltage is supplied at all times by circuit SBB26 (YE/RD). Run/Start voltage is supplied by circuit A_CBP 18 (GY/OG).

Possible Causes
^ CAN communication
^ Scan tool
^ Smart junction box (SJB) fuses:
- 4 (20A)
- 18 (10A)
^ Power distribution box (PDB) fuse:
- 26 (20A)
^ Power supply:
- Circuit SBB26 (YE/RD)
- Circuit A_CBP 18 (GY/OG)
^ Ground circuit GD145 (BK/BU)
^ 4WD control module
^ Charging system

G1-G3:

G3-G5:

G5-G6: