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.
Air Conditioning Control Assembly: Inspection
- Inspect Indictor Operation
Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to each terminal, then check that the indicator lights up as shown in the chart.
If operation is not as specified, replace the P/C board.
- Inspect Indicator Dimming Operation
- Perform each indicator light up (See step 1).
- Connect the positive (+) lead from the battery to terminal 1 and check that the each indicator dims.
If the operation is not as specified, replace the P/C board.
If the operation is as specified, replace the A/C amplifier.
- Inspect Bulb Operation
Apply the tester as shown in the illustration to the test for continuity.
If continuity exists, replace the P/C board.
If on continuity exists, replace the bulb.
- Inspect Switch Operation
Check the continuity exists between terminals while the switch is pressed.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If operations is not as specified, replace the P/C board.
If operations is as specified, check the wire harness or replace the A/C amplifier.
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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.