LS 400 V8-4.0L (1UZ-FE) (1990)
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Ambient Temperature Sensor / Switch HVAC: Customer Interest
Ambient Temperature Display - Reads Minus 22 Degrees F
REF: HEATING & AIR CONDITIONING
NO.: AC001-95
DATE: MAY 3, 1996
MODEL: LS 400, GS 300, SC 400, SC 300, ES 300
Title AMBIENT TEMPERATURE DISPLAYS -22°F
On Lexus models equipped with an ambient temperature display, -22° F may appear in the ambient temperature display if continuity through the ambient
temperature sensor circuit is interrupted. Since the -22° F is retained in memory, the condition will persist even after continuity through the ambient
temperature sensor circuit has been re-established. Climate control system operation may also be adversely affected.
This condition can be corrected by briefly removing the fuse supplying the B+ power source to the air conditioning control unit.
Do not attempt repairs before performing the following reset procedure:
RESET PROCEDURE:
Refer to the table and remove the appropriate fuse for 30 seconds and reinstall.
IMPORTANT:
Some of these fuses provide power to other systems for memory retention. Check and reset clock, radio presets, and memory as necessary.
If ambient temperature display is not corrected, refer to repair manual for diagnosis.
