Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Power Mirror Surface Position is not Memorized

DESCRIPTION

If any of the M1 or M2 seat memory switch is pressed, the outer mirror control ECU assembly LH detects the switch operation and sends the seat memory switch signal to the main body ECU (multiplex network body ECU) via CAN communication. On receiving the seat memory switch signal, the main body ECU (multiplex network body ECU) sends the memory request signal to each outer mirror control ECU assembly via CAN communication. When receiving this signal, each outer mirror control ECU assembly stores the mirror surface position based on information from the mirror position sensor, which is built into the outer rear view mirror assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• The power mirror control system (w/ Memory) uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

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• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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• The mirror surface position will not be memorized if the power switch is not on (IG).
• The mirror surface position will not be stored if the seat memory SET switch and 2 or more seat memory switches are pressed simultaneously.
• If the operation fails, the mirror surface position will not be memorized until the seat memory SET switch is released and the operation is attempted again.
• The mirror surface position will not be memorized when the mirror is operated manually.

HINT:

Each outer rear view mirror assembly has a built-in mirror vertical position sensor and mirror horizontal position sensor.

PROCEDURE

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Mirror L or Mirror R / Data List.

(e) Read the Data List according to the display on the Techstream.

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

NG

GO TO STEP 8

OK

(a) When any seat memory switch (M1 or M2) is pressed, check that the driver seat moves to the memorized position.

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OK:

The driver seat moves to the memorized position.

NG

GO TO FRONT POWER SEAT CONTROL SYSTEM (Power Seat does not Return to Memorized Position)

OK

(a) Turn the power switch on (IG).

*a Turn to Fully Left Position

(b) Using the outer mirror switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the outer mirror switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

C

GO TO STEP 6

B

(a) Temporarily replace the outer rear view mirror assembly LH with a new or known good one.

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NEXT

(a) Turn the power switch on (IG).

*a Turn to Fully Left Position

(b) Using the outer mirror switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the outer mirror switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

OK

END (OUTER REAR VIEW MIRROR ASSEMBLY LH WAS DEFECTIVE)

NG

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

(a) Temporarily replace the outer rear view mirror assembly RH with a new or known good one.

Click here

NEXT

(a) Turn the power switch on (IG).

*a Turn to Fully Left Position

(b) Using the outer mirror switch assembly, turn the mirror surface to the fully left position.

(c) Press the M1 switch while the SET switch is being pressed.

(d) Check that the buzzer sounds for 0.5 seconds and the mirror surface position is memorized.

(e) Using the outer mirror switch assembly, turn the mirror surface to the fully right position.

(f) Press the M1 switch.

(g) Check that the buzzer sounds for 0.1 seconds and the outer mirror automatically moves to the memorized fully left position.

OK

END (OUTER REAR VIEW MIRROR ASSEMBLY RH WAS DEFECTIVE)

NG

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH

(a) Remove the seat memory switch.

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(b) Inspect the seat memory switch.

Click here

NG

REPLACE SEAT MEMORY SWITCH

OK

(a) Disconnect the I21 outer mirror control ECU assembly LH connector.

(b) Disconnect the I17 seat memory switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

OK

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR