Highlander 4WD L4-2.4L (2AZ-FE) (2001)
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Control Module HVAC: Testing and Inspection
AIR CONDITIONER AMPLIFIER ASSEMBLY
a. Inspect hazard warning signal switch.
1. Connect the positive (+) lead from the battery to terminal A10-2 and A10-12 of A/C amplifier connector and negative (-) lead to terminal
A10-11.
2. Push the hazard warning switch and check that the voltage is battery positive voltage.