DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK FOR DTC
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEICER RELAY [FRONT])
CHECK AIR CONDITIONING CONTROL ASSEMBLY
CHECK NAVIGATION SYSTEM
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY
INSPECT DEICER RELAY
CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)
CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER WIRE] - DEICER RELAY AND BODY GROUND)
CHECK WINDSHIELD GLASS (WINDSHIELD DEICER WIRE)
WINDSHIELD DEICER SYSTEM - Windshield Deicer does not Operate
DESCRIPTION
When the windshield deicer switch is turned on, a windshield deicer 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 windshield deicer. When the on signal from the windshield deicer switch is received, the DEICER relay is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the DEICER relay operation is stopped.
*1: w/o Navigation System
*2: w/ 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 ()
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| | GO TO CAN COMMUNICATION SYSTEM ()
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| | GO TO CAN COMMUNICATION SYSTEM ()
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| 2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEICER RELAY [FRONT]) |
Select the Active Test using the intelligent tester to generate a control command, and then check that the windshield deicer operates ().
Air Conditioner| Tester Display | Test Part | Control Range | Diagnostic Note |
| Deicer Relay (Front) | DEICER relay operation | OFF or ON | - |
- OK:
- The windshield deicer system operates normally.
Result| Result | Proceed to |
| OK (w/o Navigation System) | A |
| OK (w/ Navigation System) | B |
| NG | C |
| 3.CHECK AIR CONDITIONING CONTROL ASSEMBLY |
Temporarily replace the air conditioning control assembly with a new or normally functioning one ().
Turn the ignition switch to ON.
Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.
Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.
- OK:
- Windshield deicer system functioning normally.
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| OK | |
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| END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE) |
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| 4.CHECK NAVIGATION SYSTEM |
Check if the navigation system functioning normally ().
- OK:
- Navigation system functioning normally.
| | GO TO NAVIGATION SYSTEM ()
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| 5.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one ().
Turn the ignition switch to ON.
Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.
Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.
- OK:
- Windshield deicer system functioning normally.
| OK | |
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| END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE) |
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| 6.CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY |
Temporarily replace the multi-media module receiver assembly with a new or normally functioning one ().
Turn the ignition switch to ON.
Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.
Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.
- OK:
- Windshield deicer system functioning normally.
| | REPLACE MULTI-DISPLAY ASSEMBLY ()
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| OK | |
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| END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY IS DEFECTIVE) |
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Remove the DEICER relay from the engine room relay block ().
Inspect the DEICER relay ().
| 8.CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY) |
Remove the DEICER relay from the engine room relay block ().
Disconnect the E36*1 or E81*2 air conditioning amplifier assembly connector.
*1: w/ Rear Heater
*2: w/o Rear Heater
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| DEICER relay terminal 2 - Body ground | Ignition switch ON | 11 to 14 V |
| DEICER relay terminal 5 - Body ground | Always | 11 to 14 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
w/ Rear Heater:| Tester Connection | Condition | Specified Condition |
| DEICER relay terminal 1 - E36-23 (FDEF) | Always | Below 1 Ω |
| DEICER relay terminal 1 - Body ground | Always | 10 kΩ or higher |
w/o Rear Heater:| Tester Connection | Condition | Specified Condition |
| DEICER relay terminal 1 - E81-40 (FDEF) | Always | Below 1 Ω |
| DEICER relay terminal 1 - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 9.CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER WIRE] - DEICER RELAY AND BODY GROUND) |
*1: w/o Heated Windshield Defroster System
*2: w/ Heated Windshield Defroster System
Disconnect the A23*1 or A63*2 windshield glass (windshield deicer wire) connector.
Remove the DEICER relay from the engine room relay block ().
Remove the HWD1, HWD2, HWD3 and HWD4 relays from the No. 2 engine room relay block ().*2
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
w/o Heated Windshield Defroster System:| Tester Connection | Condition | Specified Condition |
| A23-1 (B) - DEICER relay terminal 3 | Always | Below 1 Ω |
| A23-2 (E) - Body ground | Always | Below 1 Ω |
| DEICER relay terminal 3 - Body ground | Always | 10 kΩ or higher |
w/ Heated Windshield Defroster System:| Tester Connection | Condition | Specified Condition |
| A63-1 (B) - DEICER relay terminal 3 | Always | Below 1 Ω |
| A63-2 (E) - Body ground | Always | Below 1 Ω |
| DEICER relay terminal 3 - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 10.CHECK WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) |
Disconnect the A23*1 or A63*2 windshield glass (windshield deicer wire) connector.
*1: w/o Heated Windshield Defroster System
*2: w/ Heated Windshield Defroster System
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
w/o Heated Windshield Defroster System:| Tester Connection | Switch Condition | Specified Condition |
| A23-1 (B) - A23-2 (E) | Ignition switch ON and deicer switch on | 11 to 14 V |
w/ Heated Windshield Defroster System:| Tester Connection | Switch Condition | Specified Condition |
| A63-1 (B) - A63-2 (E) | Ignition switch ON and deicer switch on | 11 to 14 V |
Text in Illustration| *A | w/o Heated Windshield Defroster System |
| *B | w/ Heated Windshield Defroster System |
| *a | Front view of wire harness connector:
(to Window Glass [Windshield Deicer Wire]) |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| OK | |
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| REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) ()
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