NOTE: After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.

With the DRBIII®, record and erase DTC's. Cycle the ignition from ON to OFF. Start the vehicle and observe the DRBIII®. With the DRBIII®, read DTC's. If the DRBIII® displays "RUN/START HARDWIRE INPUT FAILURE", go to the next step. If the DRBIII® does not display "RUN/START HARDWIRE INPUT FAILURE", the condition that caused this DTC is currently not present. Use the wiring diagram/schematic as a guide, and inspect the related wiring harness for a possible intermittent condition.
Turn the ignition off. Gain access to the Ignition Switch connector. Turn the ignition on. While back probing, measure the voltage of the Fused Ignition Switch Output (Run/Start) circuit. If the voltage is above 10 volts, go to the next step. If the voltage is below 10 volts, replace the Ignition Switch. See STEERING COLUMN SWITCHES article.
Turn the ignition off. Gain access to the Body Control Module C2 connector. See Figure. While back probing, measure the voltage of the Fused Ignition Switch Output (Run/Start) circuit. If the voltage is above 10 volts, repair the Fused Ignition Switch Output circuit for an open. If the voltage is below 10 volts, replace the Body Control Module. See BODY CONTROL MODULE under REMOVAL & INSTALLATION.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Run/Start Hardwire Input Failure