Test E: The Four Wheel Drive (4WD) Control Module Does Not Respond To The Scan Tool

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

E1-E2:

E3-E4:

Normal Operation
The 4WD 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 4WD control module. The 4WD control module shares the HS-CAN with powertrain control module (PCM), the transmission control module (TCM), the anti-lock brake system (ABS) module, the restraints control module (RCM), the air suspension module if equipped) and the instrument cluster. 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).

DTC U0102 or DTC U0114 - sets in a module which had attempted to communicate with the 4WD control module and failed.

Possible Causes
- Fuse
- Circuit CBP35 (YE/GY) open
- Circuit GD123 (BK/GY) open
- Circuit GD133 (BK) open
- Circuit SBB35 (BU/RD) open
- Circuit SBB43 (BU/RD) open
- Circuit VDB04 (WH/BU) open (HS-CAN +)
- Circuit VDB05 (WH) open (HS-CAN -)
- 4WD control module