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sprinkles08, ASE Certified Technician
Category: Lexus
Satisfied Customers: 22676
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Have a 93 lexus sc400 heat controls dont work had the unit

Customer Question

Have a 93 lexus sc400 heat controls dont work had the unit sent out and rebuilt replaced all fuses and still wont work.
Submitted: 1 year ago.
Category: Lexus
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

If the control head doesn't operate at all then it has either failed internally or it is missing a power or ground feed. If it's missing a power feed yet fuses are good, or if it's missing a ground, then most likely you have an open circuit in the wiring.

After confirming the fuse good the next step would be to test the control head's power and ground feeds using an incandescent test light. Have the powers and grounds been checked?