Toyota CH-R Service Manual: Rear Window Defogger System does not Operate
DESCRIPTION
When the rear window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the DEF relay to operate the window defogger system.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- If the battery voltage becomes low, window defogger system operation
is canceled to prioritize supplying power to the power steering system.
Click here
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PROCEDURE
|
1. |
CHECK AIR CONDITIONING SYSTEM |
(a) Check the air conditioning system.
HINT:
Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.
OK:
The air conditioning system operates normally.
| Result |
Proceed to |
|---|---|
| OK |
A |
| NG (for TMMT Made) |
B |
| NG (for TMC Made) |
C |
| B | .gif) |
GO TO AIR CONDITIONING SYSTEM |
| C | |
GO TO AIR CONDITIONING SYSTEM |
|
.gif)
|
2. |
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) |
Rear window defogger wire |
OFF or ON |
- |
|
Tester Display |
|---|
|
Defogger Relay (Rear) |
OK:
The window defogger system operates normally.
| NG | |
GO TO STEP 4 |
|
|
3. |
REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
(a) Replace the air conditioning control assembly with a new or known good one.
Click here
(b) Check that the window defogger system operates normally.
Click here
OK:
The window defogger system operates normally.
| OK | |
END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE) |
| NG | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
4. |
INSPECT DEF RELAY |
(a) Remove the DEF relay from the No. 1 engine room relay block.
(b) Inspect the DEF relay.
Click here
| NG | |
REPLACE DEF RELAY |
|
|
5. |
CHECK HARNESS AND CONNECTOR (DEF RELAY - POWER SOURCE) |
|
(a) Remove the DEF relay from the No. 1 engine room relay block. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DEF relay holder terminal 1 - Body ground |
Ignition switch to ON |
11 to 14 V |
|
DEF relay holder terminal 5 - Body ground |
Always |
11 to 14 V |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
CHECK HARNESS AND CONNECTOR (DEF RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
|
(a) Disconnect the F72*1 or F139*2 air conditioning amplifier assembly connector.
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for TMMT Made|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DEF relay holder terminal 2 - F72-26 (RDFG) |
Always |
Below 1 Ω |
|
DEF relay holder terminal 2 or F72-26 (RDFG) - Body ground |
Always |
10 kΩ or higher |
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DEF relay holder terminal 2 - F139-5 (RDFG) |
Always |
Below 1 Ω |
|
DEF relay holder terminal 2 - F139-5 (RDFG) |
Always |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
(a) for TMMT Made (1) Reconnect the F72 air conditioning amplifier assembly connector. (2) Reinstall the DEF relay. (3) Remove the air conditioning amplifier assembly with its connectors still connected. Click here
(4) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
|
(b) for TMC Made (1) Reconnect the F139 air conditioning amplifier assembly connector. (2) Reinstall the DEF relay. (3) Remove the air conditioning amplifier assembly with its connectors still connected. Click here
(4) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
|
8. |
CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) - DEF RELAY AND BODY GROUND) |
|
(a) Disconnect the S13 and S14 back door glass (rear window defogger wire) connectors. |
|
(b) Remove the DEF relay from the No. 1 engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
S13-1 - DEF relay holder terminal 3 |
Always |
Below 1 Ω |
|
S14-1 - Body ground |
Always |
Below 1 Ω |
|
S13-1 - Body ground |
Always |
10 kΩ or higher |
| OK | |
REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Data List / Active Test
DATA LIST / ACTIVE TEST
ACTIVE TEST
HINT:
Using the Techstream to perform Active Tests allows relays, VSVs, actuators and
other items to be operated without removing any parts. This non-intrusive ...
Window Defogger Wire
Precaution
PRECAUTION
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(a) The type of ignition switch used on this model differs depending on the specifications
of the vehicle. The expressions listed in the table ...
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