| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Vehicle Exterior | Section: Lighting (ext) | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002T2I007X |
| Title: LIGHTING (EXT): LIGHTING SYSTEM: DESCRIPTION (2008 LX570) | ||
|
Front Fog Light does not Illuminate |
DESCRIPTION
The main body ECU receives a front fog light switch information signal from the light control switch (front fog switch), and illuminates the front fog lights.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) |
(a) Using the Techstream, read the Data List.
Main Body
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Front Fog Light SW |
Front fog light switch signal/ON or OFF |
ON: Front fog light switch on OFF: Front fog light switch off |
- |
OK:
When headlight dimmer switch operation is performed, the result will be the same as above.
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (FRONT FOG LIGHT RELAY) |
(a) Using the Techstream, perform the Active Test.
Main Body
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Front Fog Light Relay |
Front fog light |
ON or OFF |
- |
OK:
Fog light turns on/off.
|
|
3. |
INSPECT HEADLIGHT DIMMER SWITCH |
|
(a) Remove the headlight dimmer switch
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
4 (BFG) - 3 (LFG) |
Headlight dimmer switch (Front fog light switch) on |
Below 1 Ω |
|
Headlight dimmer switch (Front fog light switch) off |
10 kΩ or higher |
|
|
4. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND) |
|
(a) Disconnect the E14 switch connector. |
(b) Disconnect the E2 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E14-4 (BFG) - E2-28 (FFOG) |
Always |
Below 1 Ω |
|
E14-3 (LFG) - Body ground |
||
|
E14-4 (BFG) - Body ground |
Always |
10 kΩ or higher |
|
|
5. |
INSPECT FOG LIGHT RELAY (FR FOG) |
|
(a) Remove the fog light relay from the engine room relay block, junction 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 not applied to terminals 1 and 2 |
10 kΩ or higher |
|
Battery voltage applied to terminals 1 and 2 |
Below 1 Ω |
|
|
6. |
CHECK HARNESS AND CONNECTOR (FOG LIGHT RELAY - BATTERY) |
|
(a) Remove the fog light relay from the engine room relay block. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Fog light relay terminal 2 - Body ground |
Light control switch tail |
11 to 14 V |
|
Fog light relay terminal 5 - Body ground |
Always |
|
|
7. |
CHECK HARNESS AND CONNECTOR (FOG LIGHT - FOG LIGHT RELAY AND BODY GROUND) |
(a) Remove the fog light relay from the engine room relay block.
(b) Disconnect the B1 and B2 light connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for LH
for RH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Fog light relay terminal 3 - B1-1 |
Always |
Below 1 Ω |
|
B1-2 - Body ground |
||
|
B1-1 - Body ground |
Always |
10 kΩ or higher |
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Fog light relay terminal 3 - B2-1 |
Always |
Below 1 Ω |
|
B2-2 - Body ground |
||
|
B2-1 - Body ground |
Always |
10 kΩ or higher |
|
|
8. |
CHECK FRONT FOG LIGHT |
|
(a) Disconnect the E1 ECU connector. |
(b) Using a service wire, connect terminal E1-4 (FFGO) on the wire harness side and the body ground.
(c) Check that the front fog light illuminates.
OK:
Front fog light illuminates.
|
|
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