Toyota CH-R Service Manual: Mirror Heater does not Operate with Rear Defogger Switch

Toyota CH-R Service Manual / Mirror (ext) / Power Mirror Control System / Mirror Heater does not Operate with Rear Defogger Switch

DESCRIPTION

When the mirror heater switch (rear window defogger switch) on the air conditioning control assembly is pressed, the operation signal is sent to the air conditioning amplifier assembly via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the defogger relay to operate the mirror heaters.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the battery voltage is low, the mirror heater function may not operate. In this case, check the Data List item "Battery Control Count (Body ECU)".

    Click here

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

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

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Defogger Relay (Rear)

Mirror Heater

OFF or ON

-
Body Electrical > Air Conditioner > Active Test

Tester Display

Defogger Relay (Rear)

Result

Proceed to

Mirror heater operation on both mirrors is not normal

A

Mirror heater operation on RH side mirror is not normal

B

Mirror heater operation on LH side mirror is not normal

C
B

GO TO STEP 4

C

GO TO STEP 6

A

2.

CHECK WINDOW DEFOGGER SYSTEM

(a) Check the window defogger system operation.

Click here

OK:

The window defogger system operates normally.

NG

GO TO WINDOW DEFOGGER SYSTEM

OK

3.

CHECK HARNESS AND CONNECTOR (DEF RELAY - OUTER REAR VIEW MIRROR ASSEMBLY RH/LH - BODY GROUND)

(a) Remove the DEF relay from the No. 1 engine room relay block.

(b) Disconnect the I8 outer rear view mirror assembly RH connector.

(c) Disconnect the J7 outer rear view mirror assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

DEF relay holder terminal-3 - I8-8 (+)

Always

Below 1 Ω

DEF relay holder terminal-3 - J7-8 (+)

Always

Below 1 Ω

DEF relay holder terminal-3 - Body Ground

Always

10 kΩ or higher
OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (DEF RELAY - OUTER REAR VIEW MIRROR ASSEMBLY RH - BODY GROUND)

(a) Remove the DEF relay from the No. 1 engine room relay block.

(b) Disconnect the I8 outer rear view mirror assembly RH connector.

(c) Disconnect the J7 outer rear view mirror assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

DEF relay holder terminal-3 - I8-8 (+)

Always

Below 1 Ω

I8-9 (-) - Body Ground

Always

Below 1 Ω

I8-8 (+) - Body Ground

Always

10 kΩ or higher

DEF relay holder terminal-3 - Body Ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT OUTER MIRROR RH

(a) Remove the outer mirror RH.

Click here

(b) Inspect the outer mirror RH.

Click here

OK:

Outer rear mirror RH is normal.

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

NG

REPLACE OUTER MIRROR RH

6.

CHECK HARNESS AND CONNECTOR (DEF RELAY - OUTER REAR VIEW MIRROR ASSEMBLY LH - BODY GROUND)

(a) Remove the DEF relay from the No. 1 engine room relay block.

(b) Disconnect the J7 outer rear view mirror assembly LH connector.

(c) Disconnect the I8 outer rear view mirror assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

DEF relay holder terminal-3 - J7-8 (+)

Always

Below 1 Ω

J7-9 (-) - Body Ground

Always

Below 1 Ω

J7-8 (+) - Body Ground

Always

10 kΩ or higher

DEF relay holder terminal-3 - Body Ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

INSPECT OUTER MIRROR LH

(a) Remove the outer mirror LH.

Click here

(b) Inspect the outer mirror LH.

Click here

OK:

Outer rear mirror LH is normal.

OK

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

NG

REPLACE OUTER MIRROR LH

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