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#PIT4846B: Locations Of High Speed GMLAN Wiring Concerns - keywords cycle gage gauge hard hi lamp ... - page 2 / 4

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Document ID: 2389114

Page 2 of 4

  • Rear of Transfer Case- Wiring Harness chaffing on the Transfer Case.

  • Terminating Resistor-Review PIT3993C for more information.

  • Pinched harness between Pickup Box and Frame-Review PIT4444A for more information.

  • Inline Connector X115 or C115- Inspect for backed out, bent, or poor terminal fit USING THE CORRECT TEST PROBE!

  • EBCM Connector- Inspect for corrosion/water in connector/harness, backed out, or poor terminal fit USING THE CORRECT TEST PROBE!

  • PTO Connector- Inspect for corrosion/water in connector, connector not fully seated (even though the lever on the connector is locked down), and poor terminal fit USING THE CORRECT TEST PROBE!

  • FPCM (Fuel Pump Control Module) Connector or Module- Inspect for corrosion/water in connector or module, connector not fully seated (even though the lever on the connector is locked down), and poor terminal fit USING THE CORRECT TEST PROBE!

  • VCIM, Connector, or Harness (On Star Module) - Inspect for aftermarket equipment that may be mounted to the lower center part of the dash. The screws used to mount the equipment have been known to pierce the VCIM harness or module. Inspect the VCIM connector for poor terminal fit USING THE CORRECT TEST PROBE! Inspect for two VCIM's listed in the DTC module list with the TECH 2 under Vehicle Control Systems/ Vehicle DTC Information/ DTC Display, as this may indicate a faulty VCIM. If the VCIM is suspect remove the "Info" fuse, which is the power feed to the VCIM and see if the High Speed GMLAN concern is gone.

  • Inline Connector X109-Inspect for backed out, bent, or poor terminal fit USING THE CORRECT TEST PROBE! Also check for the connector not being fully seated together even though the lever on the connector is locked down, shown below.

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10/21/2010

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