Windshield Deicer Does Not Operate
WINDOW / GLASS: WINDSHIELD DEICER SYSTEM: Windshield Deicer does not Operate
- Windshield Deicer does not Operate
DESCRIPTION
When the windshield deicer switch*1 or front wiper deicer switch (outer mirror heater switch assembly)*2 is operated, the operation signal is transmitted to the air conditioning amplifier assembly via CAN and AVC-LAN communication lines*1, or directly*2. When the air conditioning amplifier assembly receives the signal, it turns on the No. 1 integration relay to operate the windshield deicer.
* *1: w/ Navigation System
* *2: w/o Navigation System
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* w/ Navigation System
The windshield deicer system uses the CAN communication and AVC-LAN communication. First, confirm that there is no malfunction in the communication lines. Refer to the How to Proceed with Troubleshooting procedure How To Proceed With Troubleshooting.
* If the battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system Freeze Frame Data.
PROCEDURE
1. PERFORM ACTIVE TEST USING TECHSTREAM (FRONT DEICER RELAY)
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(f) Perform the Active Test according to the display on the Techstream.
Air Conditioner (Air Conditioning Amplifier Assembly)
Result:
B -- GO TO AIR CONDITIONING SYSTEM (Proceed to Problem Symptoms Table) Symptom Related Diagnostic Procedures
C -- CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY AND BODY GROUND)
A -- Continue to next step.
2. INSPECT FRONT WIPER DEICER SWITCH (OUTER MIRROR HEATER SWITCH ASSEMBLY)
(a) Remove the front wiper deicer switch (outer mirror heater switch assembly) Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE FRONT WIPER DEICER SWITCH (OUTER MIRROR HEATER SWITCH ASSEMBLY) Removal
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FRONT WIPER DEICER SWITCH - BATTERY)
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - FRONT WIPER DEICER SWITCH)
(a) Disconnect the H85 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
5. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY AND BODY GROUND)
(a) Disconnect the 1G and 1H No. 1 integration relay connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - NO. 1 INTEGRATION RELAY)
(a) Disconnect the H85 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK NO. 1 INTEGRATION RELAY
(a) Reconnect the 1G and 1H No. 1 integration relay connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPLACE NO. 1 INTEGRATION RELAY Removal
OK -- Continue to next step.
8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Reconnect the H85 air conditioning amplifier assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
* *1: w/ Navigation System
* *2: w/o Navigation System
Text in Illustration
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - WINDSHIELD DEICER WIRE)
(a) Disconnect the 1H No. 1 integration relay connector.
(b) Disconnect the A59 windshield deicer wire (windshield glass) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. CHECK NO. 1 INTEGRATION RELAY
(a) Reconnect the 1H No. 1 integration relay connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
* *1: w/ Navigation System
* *2: w/o Navigation System
NG -- REPLACE NO. 1 INTEGRATION RELAY
OK -- REPLACE WINDSHIELD DEICER WIRE (WINDSHIELD GLASS) Removal
12. REPLACE NO. 1 INTEGRATION RELAY
(a) Replace the No. 1 integration relay Removal.
NEXT -- Continue to next step.
13. CHECK WINDSHIELD DEICER SYSTEM
(a) Check the windshield deicer system.
OK:
The windshield deicer system operates normally.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DCDC LINE)
OK -- END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE)