Toyota Avalon Service & Repair Manual: Mirror Heater does not Operate with Rear Defogger Switch

DESCRIPTION

When the mirror heater switch (rear window defogger switch) is operated, the mirror heater signal is sent to the air conditioning amplifier assembly and then to each outer mirror control ECU assembly via CAN communication. Based on this signal, the outer mirror control ECU assemblies operate the mirror heaters.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The power mirror control system (w/ Memory) uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the power mirror control system (w/ Memory) after confirming that the communication systems are functioning properly.

    Click here

  • If the auxiliary battery voltage is low, the mirror heater function may not operate.

PROCEDURE

1.

CHECK WINDOW DEFOGGER SYSTEM

(a) Check window defogger system operation.

Click here

OK:

Window defogger system is normal.

NG

GO TO WINDOW DEFOGGER SYSTEM

OK

2.

PERFORM ACTIVE TEST USING TECHSTREAM

(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 / Active Test.

(e) Perform an Active Test according to the display on the Techstream.

Body Electrical > Mirror L > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Mirror Heater

Mirror heater operation

OFF or ON

  • Operate with power switch on (IG) and the vehicle stopped.
  • This test turns the mirror heater on or off.
  • Mirror heater operation can be confirmed by touch.
Body Electrical > Mirror L > Active Test

Tester Display

Mirror Heater

Body Electrical > Mirror R > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Mirror Heater

Mirror heater operation

OFF or ON

  • Operate with power switch on (IG) and the vehicle stopped.
  • This test turns the mirror heater on or off.
  • Mirror heater operation can be confirmed by touch.
Body Electrical > Mirror R > Active Test

Tester Display

Mirror Heater

Result

Proceed to

Mirror heater operation on both mirrors is normal

A

Mirror heater operation on driver door mirror is not normal

B

Mirror heater operation on front passenger door mirror is not normal

C

A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

C

GO TO STEP 6

B

3.

CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - OUTER REAR VIEW MIRROR ASSEMBLY LH)

(a) Disconnect the I22 outer mirror control ECU assembly LH connector.

(b) Disconnect the I29*1 or I28*2 outer rear view mirror assembly LH connector.

  • *1: w/ Panoramic View Monitor System
  • *2: w/o Panoramic View Monitor System

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

Standard Resistance:

w/ Panoramic View Monitor System

Tester Connection

Condition

Specified Condition

I22-4 (HTR+) - I29-5 (+)

Always

Below 1 Ω

I22-12 (RTN) - I29-6 (-)

Always

Below 1 Ω

I22-4 (HTR+) or I29-5 (+) - Body ground

Always

10 kΩ or higher

I22-12 (RTN) or I29-6 (-) - Body ground

Always

10 kΩ or higher

w/o Panoramic View Monitor System

Tester Connection

Condition

Specified Condition

I22-4 (HTR+) - I28-5 (+)

Always

Below 1 Ω

I22-12 (RTN) - I28-6 (-)

Always

Below 1 Ω

I22-4 (HTR+) or I28-5 (+) - Body ground

Always

10 kΩ or higher

I22-12 (RTN) or I28-6 (-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT OUTER MIRROR LH

(a) Remove the outer mirror LH.

Click here

(b) Inspect the outer mirror LH.

Click here

NG

REPLACE OUTER MIRROR LH

OK

5.

INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH (MIRROR HEATER)

(a) Remove the outer rear view mirror assembly LH.

Click here

(b) Inspect the outer rear view mirror assembly LH (mirror heater).

Click here

OK

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

6.

CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY RH - OUTER REAR VIEW MIRROR ASSEMBLY RH)

(a) Disconnect the I6 outer mirror control ECU assembly RH connector.

(b) Disconnect the I13*1 or I12*2 outer rear view mirror assembly RH connector.

  • *1: w/ Panoramic View Monitor System
  • *2: w/o Panoramic View Monitor System

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

Standard Resistance:

w/ Panoramic View Monitor System

Tester Connection

Condition

Specified Condition

I6-4 (HTR+) - I13-5 (+)

Always

Below 1 Ω

I6-12 (RTN) - I13-6 (-)

Always

Below 1 Ω

I6-4 (HTR+) or I13-5 (+) - Body ground

Always

10 kΩ or higher

I6-12 (RTN) or I13-6 (-) - Body ground

Always

10 kΩ or higher

w/o Panoramic View Monitor System

Tester Connection

Condition

Specified Condition

I6-4 (HTR+) - I12-5 (+)

Always

Below 1 Ω

I6-12 (RTN) - I12-6 (-)

Always

Below 1 Ω

I6-4 (HTR+) or I12-5 (+) - Body ground

Always

10 kΩ or higher

I6-12 (RTN) or I12-6 (-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

INSPECT OUTER MIRROR RH

(a) Remove the outer mirror RH.

Click here

(b) Inspect the outer mirror RH.

Click here

NG

REPLACE OUTER MIRROR RH

OK

8.

INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH (MIRROR HEATER)

(a) Remove the outer rear view mirror assembly RH.

Click here

(b) Inspect the outer rear view mirror assembly RH (mirror heater).

Click here

OK

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

    How To Proceed With Troubleshooting

    Operation Check

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