Lexus IS250 IS220d GSE20 ALE20 - WINDSHIELD / WINDOWGLASS

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COMMUNICATION SYSTEM

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

REPLACE MULTI-MEDIA MODULE DISPLAY

CONFIRM REAR WINDOW DEFOGGER OPERATION

REPLACE INTEGRATION CONTROL & PANEL

CONFIRM REAR WINDOW DEFOGGER OPERATION

REPLACE RADIO RECEIVER ASSEMBLY

REAR WINDOW DEFOGGER OPERATION

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

INSPECT DEFOG RELAY

CHECK WIRE HARNESS (DEFOG RELAY - BATTERY POSITIVE)

CHECK WIRE HARNESS (DEFOG RELAY - A/C AMPLIFIER ASSEMBLY)

INSPECT DEFOGGER RELAY

CHECK WIRE HARNESS (DEFOG RELAY - BATTERY POSITIVE AND BODY GROUND)

INSPECT NOISE FILTER

CHECK WIRE HARNESS (DEFOG RELAY - NOISE FILTER)

CHECK WIRE HARNESS (DEFOGGER WIRE CONNECTOR - BODY GROUND)

WINDOW DEFOGGER SYSTEM - Rear Window Defogger System does not Operate

DESCRIPTION

  • with Navigation System:
  • When the rear window defogger switch, which is built into the multi-media module 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.
  • without Navigation System:
  • When the rear window defogger switch, which is built into the integration control & panel, 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

Window Defogger System - Rear Window Defogger System Does Not Operate. WINDSHIELD / WINDOWGLASS. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK COMMUNICATION SYSTEM

Select the DTC check on the intelligent tester to check for communication errors.

  • Result:
  • Not output DTC codesA
    Output DTC codes (Multiplex communication)B
    Output DTC codes (CAN communication)C
B
Go to step 5
C
Go to step 9
A
3.REPLACE MULTI-MEDIA MODULE DISPLAY

Replace the multi-media module display.

NEXT
4.CONFIRM REAR WINDOW DEFOGGER OPERATION

Turn the engine switch on (IG), press the defogger switch, and check that window defogger operates.

NG
Go to step 13
NG
10.INSPECT DEFOG RELAY


NG
REPLACE DEFOG RELAY
OK
11.CHECK WIRE HARNESS (DEFOG RELAY - BATTERY POSITIVE)
Window Defogger System - Rear Window Defogger System Does Not Operate. WINDSHIELD / WINDOWGLASS. Lexus IS250 IS220d GSE20 ALE20

Disconnect the DEFOG relay.

Measure the voltage according to the value(s) in the table below.

  • Voltage:
  • Engine room No. 1 R/B, J/B:
  • Tester ConnectionConditionSpecified Condition
    1 - Body groundEngine switch on (IG)10 to 14 V
NG
REPAIR OR REPLACE LH-IG FUSE OR HARNESS AND CONNECTOR
OK
12.CHECK WIRE HARNESS (DEFOG RELAY - A/C AMPLIFIER ASSEMBLY)
Window Defogger System - Rear Window Defogger System Does Not Operate. WINDSHIELD / WINDOWGLASS. Lexus IS250 IS220d GSE20 ALE20

Disconnect the DEFOG relay and A/C amplifier assembly connector.

Measure the resistance according to the value(s) in the table below.

  • Resistance:
  • Tester ConnectionConditionSpecified Condition
    2 - J58-3AlwaysBelow 1 Ω
    2 - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE A/C AMPLIFIER ASSEMBLY
13.INSPECT DEFOGGER RELAY


NG
REPLACE DEFOG RELAY
OK
14.CHECK WIRE HARNESS (DEFOG RELAY - BATTERY POSITIVE AND BODY GROUND)
Window Defogger System - Rear Window Defogger System Does Not Operate. WINDSHIELD / WINDOWGLASS. Lexus IS250 IS220d GSE20 ALE20

Disconnect the DEFOG relay.

Measure the voltage and resistance according to the value(s) in the table below.

  • Resistance:
  • Engine room No. 1 R/B, J/B:
  • Tester ConnectionConditionSpecified Condition
    4 - Body groundAlwaysBelow 1 Ω
  • Voltage:
  • Engine room No. 1 R/B, J/B:
  • Tester ConnectionConditionSpecified Condition
    5 - Body groundEngine switch on (IG)10 to 14 V
NG
REPAIR OR REPLACE DEFOG FUSE OR HARNESS AND CONNECTOR
OK
15.INSPECT NOISE FILTER
Window Defogger System - Rear Window Defogger System Does Not Operate. WINDSHIELD / WINDOWGLASS. Lexus IS250 IS220d GSE20 ALE20

Disconnect the noise filter connectors.

Measure the resistance according to the value(s) in the table below.

  • Resistance:
  • Tester ConnectionConditionSpecified Condition
    A1 - B1AlwaysBelow 1 Ω
    A1 - Body groundAlways10 kΩ or higher
NG
REPLACE NOISE FILTER
OK
16.CHECK WIRE HARNESS (DEFOG RELAY - NOISE FILTER)
Window Defogger System - Rear Window Defogger System Does Not Operate. WINDSHIELD / WINDOWGLASS. Lexus IS250 IS220d GSE20 ALE20

Disconnect the DEFOG relay and defogger wire connectors.

Measure the resistance according to the value(s) in the table below.

  • Resistance:
  • Tester ConnectionConditionSpecified Condition
    3 - Q21-1AlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
17.CHECK WIRE HARNESS (DEFOGGER WIRE CONNECTOR - BODY GROUND)
Window Defogger System - Rear Window Defogger System Does Not Operate. WINDSHIELD / WINDOWGLASS. Lexus IS250 IS220d GSE20 ALE20

Measure the resistance according to the value(s) in the table below.

  • Resistance:
  • Tester ConnectionConditionSpecified Condition
    P19-1 - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE
LEXUS IS250, IS220d / GSE20 ALE20
WINDSHIELD / WINDOWGLASS
Lexus IS250 IS220d GSE20 ALE20
WINDOW DEFOGGER SYSTEM