| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Vehicle Exterior | Section: Lighting (ext) | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001OJ600DX |
| Title: LIGHTING (EXT): LIGHTING SYSTEM: DESCRIPTION (2008 LX570) | ||
|
Stop Light does not Illuminate |
DESCRIPTION
When the stop light switch is turned on, current flows to the stop lights to illuminate them.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) |
(a) Using the Techstream, read the Data List.
Main Body
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Stop Light SW |
Stop light switch/ON or OFF |
ON: Brake pedal depressed OFF: Brake pedal released |
- |
OK:
On the Techstream screen, each item changes between ON and OFF according to above chart.
|
|
2. |
CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - BATTERY) |
|
(a) Disconnect the A39 stop light relay connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A39-6 (+B) - Body ground |
Always |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A39-4 (GND) - Body ground |
Always |
Below 1 Ω |
|
|
3. |
CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - STOP LIGHT SWITCH) |
|
(a) Disconnect the A30 stop light switch connector. |
(b) Disconnect the A39 relay connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A30-1 - A39-2 (STP) |
Always |
Below 1 Ω |
|
A30-1 - Body ground |
Always |
10 kΩ or higher |
|
|
4. |
INSPECT BRAKE LIGHT RELAY (BRK LP) |
|
(a) Remove the brake light 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 |
|
|
5. |
CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - BRAKE LIGHT RELAY) |
(a) Remove the brake light relay from the engine room relay block.
(b) Disconnect the A39 stop light control relay connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A39-6 (+B) - 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 |
|---|---|---|
|
A39-8 (OUT) - Brake light relay terminal 4 |
Always |
Below 1 Ω |
|
A39-8 (OUT) - Body ground |
Always |
10 kΩ or higher |
|
|
6. |
CHECK HARNESS AND CONNECTOR (BRAKE LIGHT RELAY - STOP LIGHT AND BODY GROUND) |
(a) Remove the brake light relay from the engine room relay block.
(b) Rear Combination Light:
(1) Disconnect the K4 and L3 light connectors.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for LH
for RH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Brake light relay terminal 3 - K4-5 (STP) |
Always |
Below 1 Ω |
|
K4-3 (E) - Body ground |
||
|
K4-5 (STP) - Body ground |
Always |
10 kΩ or higher |
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Brake light relay terminal 3 - L3-5 (STP) |
Always |
Below 1 Ω |
|
L3-3 (E) - Body ground |
||
|
L3-5 (STP) - Body ground |
Always |
10 kΩ or higher |
(c) High Mount Stop Light:
(1) Disconnect the S4 light connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Brake light relay terminal 3 - S4-1 (B) |
Always |
Below 1 Ω |
|
S4-2 (E) - Body ground |
||
|
S4-1 (B) - Body ground |
Always |
10 kΩ or higher |
|
|
7. |
CHECK HARNESS AND CONNECTOR (BRAKE LIGHT RELAY - BATTERY) |
|
(a) Remove the brake 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 |
Switch Condition |
Specified Condition |
|---|---|---|
|
Brake light relay terminal 1 - Body ground |
Engine switch on (IG) |
11 to 14 V |
|
Engine switch off |
Below 1 V |
|
|
8. |
CHECK HARNESS AND CONNECTOR (BRAKE LIGHT RELAY - SKID CONTROL ECU) |
(a) Remove the brake light relay from the engine room relay block.
(b) Disconnect the A24 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Brake light relay terminal 2 - A24-16 (STP0) |
Always |
Below 1 Ω |
|
Brake light relay terminal 2 - Body ground |
Always |
10 kΩ or higher |
|
|
9. |
CHECK STOP LIGHT CONTROL RELAY |
(a) Temporarily replace the stop light control relay with a new or normally functioning one
.
(b) Check the stop light operation.
OK:
Stop light operation is normal.
|
|
10. |
INSPECT STOP LIGHT SWITCH |
|
(a) Remove the stop light switch
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
1 - 2 |
Switch pin released |
Below 1 Ω |
|
1 - 2 |
Switch pin pushed in |
10 kΩ or higher |
|
|
11. |
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY) |
|
(a) Disconnect the A30 stop light switch connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A30-2 - Body ground |
Always |
11 to 14 V |
|
|
12. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - STOP LIGHT SWITCH) |
|
(a) Disconnect the A30 stop light switch connector. |
(b) Disconnect the 2B ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A30-1 - 2B-22 (STP) |
Always |
Below 1 Ω |
|
A30-1 - Body ground |
Always |
10 kΩ or higher |
|
|
|