Test D: The 4X4 Control Module Does Not Respond To The Scan Tool

PINPOINT TEST D: THE 4X4 CONTROL MODULE DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The 4X4 control module communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the 4X4 control module. The 4X4 control module shares the HS-CAN with the PCM, the accessory protocol interface module (APIM), the ABS module, the occupant classification system module (OCSM), the restraints control module (RCM), the headlamp control module (HCM) (if equipped), the steering angle sensor module (SASM) (if equipped) and the instrument cluster (IC). Voltage is supplied by circuits CBP35 (YE/GY) and SBP11 (BU/RD). Ground is supplied by circuit GD140 (BK/GN).

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- 4X4 control module

D1-D2:

D2-D3:

D4: