Toyota Camry (XV70): 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 is low, the window defogger system may not operate due to operation of battery load control, check the Data List item "Battery Control Count (Body ECU)".
Click here
.gif)
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.
| NG | .gif) |
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 (Back window glass) |
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) Inspect the DEF relay.
Click here
| NG | |
REPLACE DEF RELAY |
|
|
5. | CHECK HARNESS AND CONNECTOR (DEF RELAY - IG1-NO. 1 RELAY AND BATTERY) |
| (a) Remove the DEF relay from the engine room relay block and junction block assembly. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
DEF relay holder terminal-1 - Body ground |
Ignition switch 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) Remove the DEF relay from the engine room relay block and junction block assembly. |
|
(b) Disconnect the K54 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
DEF relay holder terminal-1 - K54-5 (RDFG) |
Always | Below 1 Ω |
|
DEF relay holder terminal-1 or K54-5 (RDFG) - Body ground |
Always | 10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. | CHECK HARNESS AND CONNECTOR (DEF RELAY - REAR WINDOW DEFOGGER WIRE (BACK WINDOW GLASS)) |
| (a) Remove the DEF relay from the engine room relay block and junction block assembly. |
|
(b) Disconnect the R25 rear window defogger wire (back window glass) wire connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
DEF relay holder terminal-3 - R25-1 (B) |
Always | Below 1 Ω |
|
DEF relay holder terminal-3 or R25-1 (B) - Body ground |
Always | 10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. | CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE (BACK WINDOW GLASS) - BODY GROUND) |
(a) Disconnect the S1 rear window defogger wire (back window glass) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
S1-1 (L) - Body ground |
Always | Below 1 Ω |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
9. | CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
| (a) Reconnect the K54 air conditioning amplifier assembly connector. |
|
(b) Reinstall the DEF relay.
(c) Remove the air conditioning amplifier assembly with its connectors still connected.
Click here
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K54-5 (RDFG) - K54-4 (GND) |
Ignition switch ON, rear window defogger switch on |
Below 1 V |
|
K54-5 (RDFG) - K54-4 (GND) |
Ignition switch ON, rear window defogger switch off |
11 to 14 V |
| OK | |
REPAIR OR REPLACE BACK WINDOW GLASS (REAR WINDOW DEFOGGER WIRE) |
| NG | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
READ NEXT:
SEE MORE:
Components
COMPONENTS ILLUSTRATION
*A for Fold Down Seat Type
- -
*1 REAR CENTER SEAT OUTER BELT ASSEMBLY
*2 REAR SEAT CUSHION ASSEMBLY
*3 REAR SEAT CUSHION LOCK HOOK
*4 REAR SEAT INNER BELT ASSEMBLY RH
*5 WASHER
- -
Tight
Lost Communication with Meter (B1324,B1325)
DESCRIPTION These DTCs are stored when communication between the radio and display receiver assembly and combination meter assembly or headup display (meter mirror sub-assembly)* is not possible.
DTC No. Detection Item
DTC Detection Condition Trouble Area
B1324 Lost Communic
