Toyota CH-R Service Manual: 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
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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 |
- |
|
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 | .gif) |
GO TO STEP 4 |
| C | |
GO TO STEP 6 |
|
.gif)
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
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 ...
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DESCRIPTION
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on the outer mirror sw ...
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HINT:
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DIAGNOSTIC TROUBLE CODE CHART
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Toyota C-HR (AX20) 2023-2025 Owner's Manual
Toyota CH-R Owners Manual
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Toyota CH-R Service Manual
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