DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horns to sound at intervals of 0.4 seconds. WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Press the horn switch and check if the horns sound.
(a) Remove the main body ECU (multiplex network body ECU). Click here
(b) Disconnect the 4F instrument panel junction block assembly connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Air Conditioning System(for Gasoline Model): Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure (B1423)
DESCRIPTION This DTC is stored if refrigerant pressure on the high pressure side is extremely low (176 kPa (1.8 kgf/cm2, 26 psi) or less) or extremely high (3025 kPa (30.8 kgf/cm2, 439 psi) or more). The air conditioner pressure sensor, which is installed to the high pressure side pipe to detect ref ...
