For 1990-2009 cars

# V-6 WIRING REWORK CIRCUITS 411,452,496

GR.8 C-CAR V-6 WIRING REWORK A WIRING REWORK WAS INSTITUTED IN PRODUCTION ON 1981 V-6 C-CARS PRIOR TO BROADCAST NO. 105403. THE REWORK INVOLVED THE FOLLOWING CIRCUITS: CIRCUIT 411 - LIGHT BLUE WIRE TO FUEL METERING SOLENOID: CIRCUIT 496 (DARK BLUE WIRE) AND 452 (452X) (BLACK WIRE) TO THE DETONATION SENSOR. THE ORIGINAL CONDITION WAS THAT THE INSTRUMENT PANEL HARNESS HAD THESE CIRCUITS WIRED THROUGH THE CENTER BULKHEAD CONNECTOR AND THE ENGINE HARNESS WAS WIRED THROUGH THE ENVIRONMENTAL CONNECTOR. CORRECTIONS WERE MADE TWO WAYS: (1) SOME CARS WERE CORRECTED BY MOVING THE WIRES IN THE INSTRUMENT PANEL HARNESS FROM THE CENTER BULKHEAD CONNECTOR TO THE ENVIRONMENTAL CONNECTOR. (2) OTHER CARS WERE CORRECTED ON THE ENGINE HARNESS SIDE AND ARE WIRED THROUGH THE BULKHEAD CONNECTOR. IN EITHER CASE, THE REWORK INVOLVED MATING THESE CIRCUITS THROUGH THE BULKHEAD. WHEN DIAGNOSING THESE CIRCUITS, THEY CAN BE TRACED ON THE CAR FROM THE FUEL METERING SOLENOID AND THE DETONATION SENSOR.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.