| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Vehicle Exterior | Section: Lighting (ext) | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002WL6006X |
| Title: LIGHTING (EXT): LIGHTING SYSTEM: DESCRIPTION (2008 LX570) | ||
|
HI-beam Headlight does not Illuminate |
DESCRIPTION
The main body ECU receives light control switch and dimmer switch information signals from the headlight dimmer switch, and illuminates the headlight high beam.
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 |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Head Light SW (HEAD) |
Headlight switch signal (Head) /ON or OFF |
ON: Headlight switch (Head) on OFF: Headlight switch off |
- |
OK:
When the headlight dimmer switch operation is performed, the result will be the same as above.
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT) |
(a) Using the Techstream, perform the Active Test.
Main Body
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Head Light (Hi) |
Headlight (Hi) |
ON or OFF |
- |
|
Daytime Running Light |
DRL light illumination operation |
ON or OFF |
- |
OK:
Headlight hi beam 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 |
Condition |
Specified Condition |
|---|---|---|
|
18 (T) - 12 (EL) |
Headlight dimmer switch (Light control switch) head |
Below 1 Ω |
|
20 (H) - 12 (EL) |
||
|
17 (HF) - 12 (EL) |
Headlight dimmer switch (Light control switch) flash |
|
|
11 (HU) - 12 (EL) |
||
|
11 (HU) - 12 (EL) |
Headlight dimmer switch (Light control switch) high |
|
|
18 (T) - 12 (EL) |
Headlight dimmer switch (Light control switch) off |
10 kΩ or higher |
|
20 (H) - 12 (EL) |
|
|
4. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND) |
(a) Disconnect the E14 switch connector.
(b) Disconnect the E1, E2 and 2D ECU connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E2-17 (HEAD) - E14-20 (H) |
Always |
Below 1 Ω |
|
E1-23 (TAIL) - E14-18 (T) |
||
|
E1-13 (HF) - E14-17 (HF) |
||
|
2D-13 (HU) - E14-11 (HU) |
||
|
E14-12 (EL) - Body ground |
||
|
E2-17 (HEAD) - Body ground |
Always |
10 kΩ or higher |
|
E1-23 (TAIL) - Body ground |
||
|
E1-13 (HF) - Body ground |
||
|
2D-13 (HU) - Body ground |
|
|
5. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY (HEAD HI) - BATTERY) |
|
(a) Remove the headlight relay from the engine room relay block. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
HEAD HI relay terminal 2 - Body ground |
Always |
11 to 14 V |
|
HEAD HI relay terminal 3 - Body ground |
|
|
6. |
CHECK HARNESS AND CONNECTOR (DRL NO. 3 RELAY - BODY GROUND) |
|
(a) Remove the DRL No. 3 relay from the engine room relay block. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DRL No. 3 relay terminal 1 - Body ground |
Light control switch head, dimmer switch low |
11 to 14 V |
|
Light control switch head, dimmer switch off |
Below 1 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DRL No. 3 relay terminal 2 - Body ground |
Always |
Below 1 Ω |
|
|
7. |
CHECK HARNESS AND CONNECTOR (DRL NO. 4 RELAY - BODY GROUND) |
|
(a) Remove the DRL No. 4 relay from the engine room relay block. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DRL No. 4 relay terminal 1 - Body ground |
Light control switch head, dimmer switch low |
11 to 14 V |
|
Light control switch head, dimmer switch off |
Below 1 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DRL No. 4 relay terminal 2 - Body ground |
Always |
Below 1 Ω |
|
|
8. |
INSPECT HEADLIGHT RELAY (HEAD HI) |
|
(a) Remove the headlight 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 not applied to terminals 1 and 2 |
10 kΩ or higher |
|
Battery voltage applied to terminals 1 and 2 |
Below 1 Ω |
|
|
9. |
INSPECT DRL NO. 3 RELAY |
|
(a) Remove the DRL No. 3 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 not applied to terminals 1 and 2 |
10 kΩ or higher |
|
Battery voltage applied to terminals 1 and 2 |
Below 1 Ω |
|
|
3 - 4 |
Battery voltage not applied to terminals 1 and 2 |
Below 1 Ω |
|
Battery voltage applied to terminals 1 and 2 |
10 kΩ or higher |
|
|
10. |
INSPECT DRL NO. 4 RELAY |
|
|
(a) Remove the DRL No. 4 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 not applied to terminals 1 and 2 |
10 kΩ or higher |
|
Battery voltage applied to terminals 1 and 2 |
Below 1 Ω |
|
|
11. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT HI RELAY - DRL NO. 3 RELAY AND DRL NO. 4 RELAY) |
(a) Remove the headlight relay, DRL No. 3 relay and DRL No. 4 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 |
|---|---|---|
|
HEAD HI relay terminal 5 - DRL No. 3 relay terminal 5 |
Always |
Below 1 Ω |
|
DRL No. 3 Relay terminal 3 - DRL No. 4 Relay terminal 5 |
||
|
HEAD HI relay terminal 5 - Body ground |
Always |
10 kΩ or higher |
|
|
12. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT HI RELAY - DRL NO. 4 RELAY AND BODY GROUND) |
|
(a) Remove the headlight relay and DRL No. 4 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 |
|---|---|---|
|
HEAD HI relay terminal 5 - DRL No. 4 relay terminal 5 |
Always |
Below 1 Ω |
|
DRL No. 4 relay terminal 3 - Body ground |
||
|
HEAD HI relay terminal 5 - Body ground |
Always |
10 kΩ or higher |
|
|
13. |
CHECK HARNESS AND CONNECTOR (DRL NO. 3 RELAY - DAYTIME RUNNING LIGHT RESISTOR) |
(a) Remove the DRL No. 3 relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
DRL No. 3 relay terminal 4 - A33-1 (B) |
Always |
Below 1 Ω |
|
A33-1 (B) - Body ground |
Always |
10 kΩ or higher |
|
|
14. |
CHECK HARNESS AND CONNECTOR (DAYTIME RUNNING LIGHT RESISTOR - BODY GROUND) |
|
(a) Remove the DRL No. 3 relay from the engine room relay block. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A33-2 (E) - Body ground |
Always |
Below 1 Ω |
|
|
15. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT HI RELAY - MAIN BODY ECU) |
(a) Remove the headlight 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 |
|---|---|---|
|
HEAD HI relay terminal 1 - 2B-16 (DRL)*1 |
Always |
Below 1 Ω |
|
HEAD HI relay terminal 1 - 2B-16 (DIM)*2 |
Always |
Below 1 Ω |
|
HEAD HI relay terminal 1 - Body Ground |
Always |
10 kΩ or higher |
*1: for U.S.A.
*2: except U.S.A.
|
|
16. |
CHECK MAIN BODY ECU |
(a) Temporarily replace the main body ECU with a new or normally functioning one.
(b) Check that the headlight high beam illuminates.
OK:
Headlight high beam illuminates
|
|
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