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

PINPOINT TEST E: 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 transmission control module (TCM), the ABS module, the restraints control module (RCM), the air suspension module (if equipped) and the instrument cluster (IC). Voltage is supplied by circuits CBP35 (YE/GY), SBB35 (BU/RD) and SBB43 (BU/RD). Ground is supplied by circuits GD123 (BK/GY) and GD133 (BK).

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

E1-E3:

E3-E4: