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Deicer (Diagnostics): Overview Lexus LX J200

Heated Glass/defoggers 9 illustrations ~1009 words

Scheme 1

Scheme 1: ILLUSTRATION
Scheme 1: ILLUSTRATION

Scheme 2

Scheme 2: ILLUSTRATION
Scheme 2: ILLUSTRATION

Scheme 3

Scheme 3: SYSTEM DIAGRAM
Scheme 3: SYSTEM DIAGRAM
TransmitterReceiverSignalLine
Display and navigation module display*1Air conditioning amplifierWindshield deicer switch signalCAN
Multi-display*2Air conditioning amplifierWindshield deicer switch signalCAN

COMMUNICATION TABLE

*1: w/ Navigation System

*2: w/o Navigation System

SYSTEM DESCRIPTION

  1. GENERAL The thin heater wires of the windshield deicer system are attached to the inside of the windshield glass and deice the windshield surface quickly. The indicator light illuminates while the system is operating. The system automatically turns off after approximately 15 minutes.
  2. FUNCTION OF MAIN COMPONENT Component Outline Deicer switch Located on the display and navigation module display*1 or multi-display*2, it detects deicer switch operation and transmits signals to the air conditioning amplifier through the CAN communication line. Deicer relay Receives windshield deicer activation request signals from the air conditioning amplifier and supplies power to the windshield deicer. Windshield deicer Receives power from the deicer relay and heats the windshield deicer wire. *1: w/ Navigation System *2: w/o Navigation System
  3. DESCRIPTION Function Outline Deice front window surface The deicer relay receives windshield deicer activation request signals from the air conditioning amplifier and supplies power to the windshield deicer. Receives power from the deicer relay and heats the windshield deicer wire.

DESCRIPTION

When the windshield deicer switch is turned on, a windshield deicer activation request signal is sent via the CAN communication line to the air conditioning amplifier. Then the air conditioning amplifier operates the windshield deicer. When the on signal from the switch is received, the deicer relay (DEICER) is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the deicer relay (DEICER) operation is stopped.

Scheme 4

Scheme 4: WIRING DIAGRAM
Scheme 4: WIRING DIAGRAM

Scheme 5

Scheme 5: PROCEDURE
Scheme 5: PROCEDURE

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9
  1. CHECK FOR DTC Check for DTC. OK DTC is not output. NG --> See step 15 OK: Go to next step
  2. PERFORM ACTIVE TEST USING TECHSTREAM (DEICER RELAY) Select the Active Test using the Techstream 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 - RESULT Result Proceed to Windshield deicer operates normally (w/ Navigation System) A Windshield deicer operates normally (w/o Navigation System) B Windshield deicer does not operate C C --> See step 7 B --> See step 5 A: Go to next step
  3. REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Temporarily replace the display and navigation module display with a new or normally functioning one. Refer to «REMOVAL»(/lexus/lx/j200-2007-2012/remont/navigation-system/#navigation-service-information) . NEXT: Go to next step
  4. CHECK WINDSHIELD DEICER SYSTEM Turn the engine switch on (IG). 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. NG --> See step 14 OK --> END
  5. REPLACE MULTI-DISPLAY Temporarily replace the multi-display with a new or normally functioning one. Refer to «REMOVAL»(/lexus/lx/j200-2007-2012/remont/entertainment-systems/#audio-video-multi-display-service-information) . NEXT: Go to next step
  6. CHECK WINDSHIELD DEICER SYSTEM Turn the engine switch on (IG). 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. NG --> See step 14 OK --> END
  7. CHECK FUSE (DEICER) Remove the DEICER fuse 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 DEICER fuse Always Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
  8. INSPECT DEICER RELAY Remove the deicer 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 3 - 5 Battery voltage is not applied to terminals 1 and 2 10 kohms or higher Battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE DEICER RELAY OK: Go to next step
  9. CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY) Remove the deicer relay from the engine room relay block. Disconnect the E36 air conditioning amplifier connector. 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 Engine switch on (IG) 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 Tester Connection Condition Specified Condition Deicer relay terminal 1 - E36-23 (FDEF) Always Below 1 ohms Deicer relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  10. CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE) Remove the deicer relay from the engine room relay block. Disconnect the A23 windshield deicer wire connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A23-1 (B) - Deicer relay terminal 3 Always Below 1 ohms Deicer relay terminal 3 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  11. CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND) Disconnect the A23 windshield deicer wire connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A23-2 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  12. CHECK WINDSHIELD DEICER WIRE Disconnect the A23 windshield deicer wire connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A23-1 (B) - A23-2 (E) Engine switch on (IG) and deicer switch on 11 to 14 V NG --> See step 14 OK --> See step 13
  13. REPLACE WINDSHIELD GLASS. Refer to «REMOVAL»
  14. REPLACE AIR CONDITIONING AMPLIFIER. Refer to «REMOVAL»
  15. GO TO CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»

See also:
• REMOVAL
• REMOVAL

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