Test G: The Four Wheel Drive (4WD) Control Module Does Not Respond to the Scan Tool

PINPOINT TEST G: THE FOUR WHEEL DRIVE (4WD) CONTROL MODULE DOES NOT RESPOND TO THE SCAN TOOL

G1-G3:

G3-G4:

Normal Operation
The 4WD control module communicates with the scan tool through the International Standards Organization (ISO) 9141 communication network. Circuit 70 (LB/WH) provides the diagnostic connection to the data link connector (DLC). The 4WD control module shares the ISO network with the parking aid module and the restraints control module (RCM). Voltage for the 4WD control module is provided by circuits 640 (RD/YE), 1002 (BK/PK) and 1306 (PK/WH). Circuit 57 (BK) provides ground.

Possible Causes
- Fuse
- Circuit 57 (BK) open
- Circuit 70 (LB/WH) open
- Circuit 640 (RD/YE) open
- Circuit 1002 (BK/PK) open
- Circuit 1306 (PK/WH) open
- 4WD control module