Rear Window Defogger System Does Not Operate
WINDOW / GLASS: WINDOW DEFOGGER SYSTEM: Rear Window Defogger System does not Operate
- Rear Window Defogger System does not Operate
DESCRIPTION
* w/ Navigation System
When the rear window defogger switch, which is built into the multi-display assembly, is operated, the operation signals are transmitted to the A/C amplifier assembly through AVC-LAN and BEAN. When the A/C amplifier assembly receives the signals, it turns on the DEFOG relay to operate the rear window defogger.
* w/o Navigation System
When the rear window defogger switch, which is built into the integration control and panel assembly, is operated, the operation signals are transmitted to the A/C amplifier assembly through AVC-LAN and BEAN. When the A/C amplifier assembly receives the signals, it turns on the DEFOG relay to operate the rear window defogger.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Check the value(s) by referring to the table below, and then check the window defogger operation Component Tests and General Diagnostics.
Air Conditioner:
OK:
Rear window defogger normally operates.
NG -- CHECK HARNESS AND CONNECTOR (DEFOG RELAY - BATTERY)
OK -- Continue to next step.
2. CHECK FOR DTC (MULTIPLEX COMMUNICATION SYSTEM)
(a) Use the Techstream to check if the multiplex communication system is functioning normally Multiplex Communication System.
Result:
C -- CHECK FOR DTC (NAVIGATION SYSTEM)
B -- GO TO MULTIPLEX COMMUNICATION Multiplex Communication System
A -- Continue to next step.
3. CHECK FOR DTC (AUDIO VISUAL SYSTEM (w/o Navigation System))
(a) Use the Techstream to check if the audio and visual system (w/o navigation system) is functioning normally Audio and Visual System (w/o Navigation System).
Result:
B -- GO TO AUDIO AND VISUAL SYSTEM (w/o Navigation System) Audio and Visual System (w/o Navigation System)
A -- Continue to next step.
4. REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY
(a) Replace the integration control and panel assembly Removal.
NEXT -- Continue to next step.
5. CONFIRM REAR WINDOW DEFOGGER OPERATE
(a) Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates Component Tests and General Diagnostics.
OK:
Rear window defogger normally operates.
NG -- REPLACE RADIO RECEIVER ASSEMBLY
OK -- END
6. REPLACE RADIO RECEIVER ASSEMBLY
(a) Replace the radio receiver assembly Removal.
NEXT -- Continue to next step.
7. CONFIRM REAR WINDOW DEFOGGER OPERATE
(a) Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates Component Tests and General Diagnostics.
OK:
Rear window defogger normally operates.
NG -- REPLACE GATEWAY ECU
OK -- END
8. REPLACE GATEWAY ECU
(a) Replace the gateway ECU Removal.
NEXT -- Continue to next step.
9. CONFIRM REAR WINDOW DEFOGGER OPERATE
(a) Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates Component Tests and General Diagnostics.
OK:
Rear window defogger normally operates.
NG -- REPLACE A/C AMPLIFIER ASSEMBLY Removal
OK -- END
10. CHECK FOR DTC (NAVIGATION SYSTEM)
(a) Use the Techstream to check if the navigation system is functioning normally Navigation System (for HDD).
Result:
B -- GO TO NAVIGATION SYSTEM Navigation System (for HDD)
A -- Continue to next step.
11. REPLACE MULTI-DISPLAY ASSEMBLY
(a) Replace the multi-display assembly Removal.
NEXT -- Continue to next step.
12. CONFIRM REAR WINDOW DEFOGGER OPERATE
(a) Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates Component Tests and General Diagnostics.
OK:
Rear window defogger normally operates.
NG -- REPLACE GATEWAY ECU
OK -- END
13. REPLACE GATEWAY ECU
(a) Replace the gateway ECU Removal.
NEXT -- Continue to next step.
14. CONFIRM REAR WINDOW DEFOGGER OPERATE
(a) Turn the engine switch on (IG), press the window defogger switch, and check that window defogger operates Component Tests and General Diagnostics.
OK:
Rear window defogger normally operates.
NG -- REPLACE A/C AMPLIFIER ASSEMBLY Removal
OK -- END
15. CHECK HARNESS AND CONNECTOR (DEFOG RELAY - BATTERY)
(a) Disconnect the DEFOG relay from engine room No. 1 relay block and junction block.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR, OR LH-IG FUSE
OK -- Continue to next step.
16. CHECK HARNESS AND CONNECTOR (DEFOG RELAY- BATTERY)
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR, OR DEFOG FUSE
OK -- Continue to next step.
17. INSPECT DEFOG RELAY
(a) Measure the resistance of the DEFOG relay.
Standard Resistance:
NG -- REPLACE DEFOG RELAY
OK -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - DEFOG RELAY)
(a) Reconnect the DEFOG relay.
(b) Disconnect the J58 connector from the A/C amplifier assembly.
(c) 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.
19. INSPECT A/C AMPLIFIER ASSEMBLY
(a) Reconnect the J58 connector to the A/C amplifier assembly.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- REPLACE A/C AMPLIFIER ASSEMBLY Removal
OK -- Continue to next step.
20. CHECK HARNESS AND CONNECTOR (DEFOG RELAY - REAR DEFOGGER WIRE)
(a) Disconnect the DEFOG relay and defogger wire connectors.
(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.
21. INSPECT NOISE FILTER
(a) Disconnect the noise filter connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE NOISE FILTER
OK -- Continue to next step.
22. CHECK HARNESS AND CONNECTOR (REAR DEFOGGER WIRE - BODY GROUND)
(a) Disconnect the rear defogger wire connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR REAR WINDOW DEFOGGER WIRE Service and Repair