The OBD2 port and cigarette lighter in your 2001 Chevy Blazer share a common power source. If neither is working correctly, a blown fuse is often the culprit. This article pinpoints the location of the power fuse responsible for both the OBD2 port and the cigarette lighter in a 2001 Chevy Blazer.
Fuse 13, a 20-amp fuse located in the underhood fuse box, powers both the OBD2 port and the cigarette lighter. Sometimes a blown fuse may appear visually intact. Therefore, it’s recommended to replace Fuse 13 with a known good 20-amp fuse as the first troubleshooting step. This simple action often resolves the issue.
The wiring diagram illustrates the straightforward circuit: power flows from the load side of Fuse 13 directly to pin 16 of the OBD2 port and the center terminal (Pin A) of the cigarette lighter.
If replacing Fuse 13 doesn’t solve the problem, further diagnostics are necessary. Use a multimeter to verify the presence of 12 volts on both sides of Fuse 13. With the fuse in place, touch the positive probe to each exposed terminal of the fuse while grounding the negative lead. A reading of 12 volts on each side indicates a good fuse and power supply.
If 12 volts are not present on both sides of Fuse 13, use the ohmmeter setting on your multimeter to check for continuity between the load side of Fuse 13 and pin 16 of the OBD2 port. A reading of zero ohms indicates a good connection. A higher reading suggests a break in the wiring between the fuse box and the OBD2 port, requiring further inspection of the wiring harness.
After confirming power at Fuse 13, check the OBD2 port and cigarette lighter functionality again. If they are still not working, the problem may lie within the components themselves, or there could be additional wiring issues beyond the scope of this article.
By understanding the power source shared by the OBD2 port and cigarette lighter, and knowing the location of the responsible fuse (Fuse 13 in the underhood fuse box), you can effectively troubleshoot common electrical issues in your 2001 Chevy Blazer. Remember to always use a known good fuse for testing and replace it with the correct amperage rating.
