| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Vehicle Exterior | Section: Window/Glass | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002LI800EX |
| Title: WINDOW / GLASS: WINDSHIELD DEICER SYSTEM: DESCRIPTION (2008 LX570) | ||
|
Windshield Deicer does not Operate |
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.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Check for DTC.
OK:
DTC is not output.
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (DEICER RELAY) |
(a) 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 |
|
|
3. |
REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY |
(a) Temporarily replace the display and navigation module display with a new or normally functioning one
.
|
|
4. |
CHECK WINDSHIELD DEICER SYSTEM |
(a) Turn the engine switch on (IG).
(b) Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.
(c) Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.
OK:
Windshield deicer system functioning normally.
|
|
5. |
REPLACE MULTI-DISPLAY |
(a) Temporarily replace the multi-display with a new or normally functioning one
.
|
|
6. |
CHECK WINDSHIELD DEICER SYSTEM |
(a) Turn the engine switch on (IG).
(b) Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.
(c) Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.
OK:
Windshield deicer system functioning normally.
|
|
7. |
CHECK FUSE (DEICER) |
(a) Remove the DEICER fuse from the engine room junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DEICER fuse |
Always |
Below 1 Ω |
|
|
8. |
INSPECT DEICER RELAY |
(a) Remove the deicer relay from the engine room relay block.
(b) 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 kΩ or higher |
|
Battery voltage is applied to terminals 1 and 2 |
Below 1 Ω |
|
|
9. |
CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY) |
(a) Remove the deicer relay from the engine room relay block.
(b) Disconnect the E36 air conditioning amplifier connector.
(c) 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 |
(d) 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 Ω |
|
Deicer relay terminal 1 - Body ground |
Always |
10 kΩ or higher |
|
|
10. |
CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE) |
(a) Remove the deicer relay from the engine room relay block.
(b) Disconnect the A23 windshield deicer wire connector.
(c) 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 Ω |
|
Deicer relay terminal 3 - Body ground |
Always |
10 kΩ or higher |
|
|
11. |
CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND) |
(a) Disconnect the A23 windshield deicer wire connector.
(b) 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 Ω |
|
|
12. |
CHECK WINDSHIELD DEICER WIRE |
(a) Disconnect the A23 windshield deicer wire connector.
(b) 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 |
|
|
|