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.

(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

GO TO STEP 4

GO TO STEP 6

2.	CHECK WINDOW DEFOGGER SYSTEM

(a) Check the window defogger system operation.

Click here

OK:

The window defogger system operates normally.

GO TO WINDOW DEFOGGER SYSTEM

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.

(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

USE SIMULATION METHOD TO CHECK

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.

(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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

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.

(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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

REPLACE OUTER MIRROR LH

Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any part ...

Power Retractable Mirrors do not Operate with Power Retract Mirror Switch

DESCRIPTION The outer mirror switch assembly sends a mirror retract/return signal to the main body ECU (multiplex network body ECU) when the retractable outer mirror switch on the outer mirror sw ...

Other materials:

Toyota CH-R Service Manual > Continuously Variable Transaxle System: Torque Converter Clutch Solenoid Circuit Low (P2769,P2770)
DESCRIPTION Based on the signal received by the shift solenoid valve SL, the ECM uses the shift solenoid valve SLU to control the lock-up clutch pressure. If there is an open or short in the shift solenoid valve SL circuit, the ECM stops sending current to the defective shift solenoid valve. ...

Toyota CH-R Service Manual > Black Out Tape(for Rear Door): Components
COMPONENTS ILLUSTRATION *1 REAR DOOR BELT REAR SEAL *2 REAR DOOR BELT SEAL *3 REAR DOOR GLASS INNER WEATHERSTRIP *4 REAR DOOR INSIDE HANDLE BEZEL PLUG *5 REAR DOOR REAR FRAME ...

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

Data List / Active Test

Power Retractable Mirrors do not Operate with Power Retract Mirror Switch

Other materials:

Toyota CH-R Owners Manual

Toyota CH-R Service Manual