DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK FOR DTC
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEFOGGER RELAY)
REPLACE AIR CONDITIONING CONTROL ASSEMBLY
CHECK WINDOW DEFOGGER SYSTEM
CHECK NAVIGATION SYSTEM
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
CHECK WINDOW DEFOGGER SYSTEM
REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY
CHECK WINDOW DEFOGGER SYSTEM
INSPECT DEFOGGER RELAY (DEFOG)
CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)
CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - DEFOGGER RELAY AND BODY GROUND)
CHECK REAR WINDOW DEFOGGER WIRE
CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)
CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - DEFOGGER RELAY AND BODY GROUND)
CHECK REAR WINDOW DEFOGGER WIRE
WINDOW DEFOGGER SYSTEM - Rear Window Defogger System does not Operate
DESCRIPTION
When the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication line*1 or CAN communication line and UART communication line*2 to the air conditioning amplifier assembly. Then the air conditioning amplifier assembly operates the rear window defogger. When the on signal from the switch is received, the defogger relay (DEFOG) is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the defogger relay (DEFOG) operation is stopped.
- *1: w/o Navigation System
WIRING DIAGRAM
INSPECTION PROCEDURE
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
*1: w/o Navigation System
*2: w/ Navigation System
Check if the LIN communication system*1 or CAN communication system*2 is functioning normally.
LIN communication system: ()
CAN communication system (for LHD): ()
CAN communication system (for RHD): ()
Result| Result | Proceed to |
| DTC is not output | A |
| LIN DTC is output*1 | B |
| CAN DTC is output (for LHD)*2 | C |
| CAN DTC is output (for RHD)*2 | D |
| | GO TO LIN COMMUNICATION SYSTEM ()
|
|
|
| | GO TO CAN COMMUNICATION SYSTEM ()
|
|
|
| | GO TO CAN COMMUNICATION SYSTEM ()
|
|
|
| 2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEFOGGER RELAY) |
Select the Active Test using the intelligent tester to generate a control command, and then check that the rear window defogger operates ().
Air Conditioner| Tester Display | Test Part | Control Range | Diagnostic Note |
| Defogger Relay (Rear) | Rear window defogger relay operation | OFF or ON | - |
- OK:
- On intelligent tester screen, item changes between ON and OFF according to above chart.
Result| Result | Proceed to |
| OK (w/o Navigation System) | A |
| OK (w/ Navigation System) | B |
| NG | C |
| 3.REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
Temporarily replace the air conditioning control assembly with a new or normally functioning one ().
| 4.CHECK WINDOW DEFOGGER SYSTEM |
Turn the ignition switch ON.
Check that pressing the defogger switch illuminates the indicator and warms the rear window surface.
Check that after approximately 15 minutes, the indicator light turns off and the rear window defogger deactivates.
- OK:
- Rear window defogger system functioning normally.
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
|
| OK | |
| |
| END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE) |
|
| 5.CHECK NAVIGATION SYSTEM |
Check if the navigation system function properly ().
- OK:
- Navigation system function properly.
| | GO TO NAVIGATION SYSTEM ()
|
|
|
| 6.REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one ().
| 7.CHECK WINDOW DEFOGGER SYSTEM |
Turn the ignition switch ON.
Check that pressing the defogger switch illuminates the indicator and warms the rear window surface.
Check that after approximately 15 minutes, the indicator light turns off and the rear window defogger deactivates.
- OK:
- Rear window defogger system functioning normally.
| OK | |
| |
| END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE) |
|
| 8.REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY |
Temporarily replace the multi-media module receiver assembly with a new or normally functioning one ().
| 9.CHECK WINDOW DEFOGGER SYSTEM |
Turn the ignition switch ON.
Check that pressing the defogger switch illuminates the indicator and warms the rear window surface.
Check that after approximately 15 minutes, the indicator light turns off and the rear window defogger deactivates.
- OK:
- Rear window defogger system functioning normally.
| OK | |
| |
| END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY IS DEFECTIVE) |
|
| 10.INSPECT DEFOGGER RELAY (DEFOG) |
Remove the defogger relay from the engine room junction block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 3 - 4 | Battery voltage is not applied to terminals 1 and 2 | Below 1 Ω |
| 3 - 5 | 10 kΩ or higher |
| 3 - 4 | Battery voltage is applied to terminals 1 and 2 | 10 kΩ or higher |
| 3 - 5 | Below 1 Ω |
Result| Result | Proceed to |
| OK (w/ Rear Heater) | A |
| OK (w/o Rear Heater) | B |
| NG | C |
| 11.CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY) |
Remove the defogger relay from the engine room relay block.
Disconnect the E36 air conditioning amplifier assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| Defogger relay terminal 1 - Body ground | Ignition switch ON | 11 to 14 V |
| Defogger relay terminal 5 - Body ground | Always | 11 to 14 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| Defogger relay terminal 2 - E36-24 (RDEF) | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 12.CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - DEFOGGER RELAY AND BODY GROUND) |
Disconnect the S20 and S21 defogger wire connectors.
Remove the defogger relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| S20-1(B) - Defogger relay terminal 3 | Always | Below 1 Ω |
| S21-1(B) - Body ground |
| Defogger relay terminal 4 - Body ground |
| S20-1(B) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 13.CHECK REAR WINDOW DEFOGGER WIRE |
Disconnect the S20 and S21 defogger wire connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| S20-1 (B) - S21-1 (E) | Ignition switch ON and defogger switch on | 10 kΩ or higher |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
|
| OK | |
| |
| REPLACE BACK WINDOW GLASS ()
|
|
| 14.CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY) |
Remove the defogger relay from the engine room relay block.
Disconnect the E81 air conditioning amplifier assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| Defogger relay terminal 1 - Body ground | Ignition switch ON | 11 to 14 V |
| Defogger relay terminal 5 - Body ground | Always | 11 to 14 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| Defogger relay terminal 2 - E81-38 (RDEF) | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 15.CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - DEFOGGER RELAY AND BODY GROUND) |
Disconnect the S20 and S21 defogger wire connectors.
Remove the defogger relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| S20-1(B) - Defogger relay terminal 3 | Always | Below 1 Ω |
| S21-1(B) - Body ground |
| Defogger relay terminal 4 - Body ground |
| S20-1(B) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 16.CHECK REAR WINDOW DEFOGGER WIRE |
Disconnect the S20 and S21 defogger wire connectors.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| S20-1 (B) - S21-1 (E) | Ignition switch ON and defogger switch on | 11 to 14 V |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
|
| OK | |
| |
| REPLACE BACK WINDOW GLASS ()
|
|
