Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- CHECK FOR AN ACTIVE DTC NOTE:
Before proceeding with the diagnostic procedure, verify that the connections are proper made, properly seated and verify proper pin terminal tension. A loose connection at any of the related connectors may cause the DTC to set.
- Turn the ignition on.
- With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
- Go To 2.
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- CHECK THE VOLTAGE OF (D506) LIN BUS CIRCUIT AT THE RIGHT STEERING WHEEL SWITCH (SPEED CONTROL SWITCH)
- Turn the ignition off.WARNING:
Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
- Turn the ignition off.
NO RELATED
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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.