Probing Electrical Connectors: Backprobe

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Important:

Backprobe connector terminals only when specifically required in diagnostic procedures.
Do not backprobe a sealed (Weather Pack®) connector, less than a 280 series Metri-Pack connector, a Micro-Pack connector, or a flat wire (dock and lock) connector.
Backprobing can be a source of damage to connector terminals Use care in order to avoid deforming the terminal, either by forcing the test probe too far in to the cavity or by using too large of a test probe.
After backprobing any connector, inspect for terminal damage. If terminal damage is suspected, test for proper terminal contact.

Do not disconnect the connector and probe the terminals from the harness side (back) of the connector.