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.
A/C Request/Grant Signals: Discovery
When A/C switch is turned on, a 12-volt A/C request signal will be seen at ECM Red 36-pin connector terminal No. 28 (Yellow/Black wire). When ECM confirms proper system operating conditions, a 12-volt A/C grant signal will be seen at ECM Black 36-pin connector terminal No. 1 (Black/Gray wire).
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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