INSPECTION PROCEDURE 1. INSPECT INNER REAR VIEW MIRROR ASSEMBLY (w/o Garage Door Opener System) (a) Inspect the operation of the electrochromic inner rear view mirror assembly. 
(1) Connect a positive (+) lead from the auxiliary battery to terminal 1 and a negative (-) lead to terminal 2. (2) Press the AUTO switch. (3) Attach black colored tape to the forward sensor to prevent it from sensing. (4) Light up the mirror with an electric light, and check that the mirror surface changes from bright to dark. OK: Mirror surface changes from bright to dark. (5) Measure the voltage according to the value(s) in the table below. Standard Voltage:
If the result is not as specified, replace the inner rear view mirror assembly. 2. INSPECT INNER REAR VIEW MIRROR ASSEMBLY (w/ Garage Door Opener System) (a) Inspect the operation of the electrochromic inner rear view mirror assembly. 
(1) Connect a positive (+) lead from the auxiliary battery to terminal 1 and a negative (-) lead to terminal 2. (2) Press the EC switch. (3) Attach black colored tape to the forward sensor to prevent it from sensing. (4) Light up the mirror with an electric light, and check that the mirror surface changes from bright to dark. OK: Mirror surface changes from bright to dark. (5) Measure the voltage according to the value(s) in the table below. Standard Voltage:
If the result is not as specified, replace the inner rear view mirror assembly. |
Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Pre-collision System(for Hv Model): Lost Communication with Front Camera Module (U023A)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area U023A Lost Communication with Front Camera Module When the power switch is on (IG), a communication error between the forward recognition camera and driving support ECU assembly is detected for approximately 3 seconds. CAN commu ...
