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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616  Kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.

  1. Key OFF. Disconnect the X3 harness connector at the TCCM.
  2. Measure the voltage at the battery. The voltage should be above 12.0 V.
  3. Install EL-49742  harness. Test for B+ (+0.0/-0.5 V) between the 12 volt terminal (red) and the ground terminal (black) of EL-49742  harness.
    • If the voltage is less than the specified value, a vehicle wide issue is indicated. Inspect the battery positive circuit wire routing for chafed wires or damaged inline harness connectors that could cause unexpected voltage drops.
  4. Using the purple probe J 35616-4A, test for B+ (+0.0/-0.5 V) between the battery positive voltage circuit, TCCM X3 pin C, and the ground terminal of EL-49742  harness, black terminal.
    • If the voltage is less than the specified range, test the battery positive voltage circuit for an open/high resistance or short to ground.
  5. Using the purple probe J 35616-4A, test for B+ (+0.0/-0.5 V) between the battery positive voltage circuit, TCCM X3 pin C, and the ground circuit TCCM X3 pin D.
    • If the voltage is less than the specified range, test the ground circuit for an open/high resistance, short to ground or short together condition.
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