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Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. 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 probes 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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