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Component Testing: TCCM

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Key OFF. Disconnect the X1 connector at the TCSCS.
  2. Using the L-BU probe J 35616-64B, connect a test light between the TCSCS harness as specified below for the LED being tested.
  3. Using the special function ability of the scan tool, command the affected LED ON and OFF. The test light should turn off and on as commanded.
    • If the test light does not function as commanded replace the TCCM.
Mode 2 High 4 High 4 Low N
Voltage - pin 4 4 4 2
Ground - pin 7 9 10 3
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