DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
INSPECT CLOCK ASSEMBLY
CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - TURN SIGNAL FLASHER)
INSPECT FUSE (LH-IG, TURN-HAZ)
CHECK HARNESS AND CONNECTOR (POWER SOURCE)
CHECK HARNESS AND CONNECTOR
LIGHTING SYSTEM - Hazard Warning Switch Circuit
DESCRIPTION
The hazard warning switch sends a signal to the turn signal flasher.
The turn signal flasher blinks the turn signal lights.
Also, the main body ECU RH activates the flasher relay when the alarm of the theft deterrent system goes off.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Select the item(s) below in the ACTIVE TEST, and check the operation.
ACTIVE TEST: Body (Main Body ECU RH)| Item | Test Details | Diagnostic Note |
| Hazard | LH and RH side turn signal lights operation ON / OFF | - |
- OK:
- LH and RH side turn signal lights flash.
Remove the clock assembly.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- With Navigation System:
| Tester Connection | Condition | Specified Condition |
| J54-12 (F) - J54-2 (E) | Switch is pushed in | Below 1 Ω |
| J54-12 (F) - J54-2 (E) | Switch is not pushed in | 10 kΩ or higher |
- Without Navigation System:
| Tester Connection | Condition | Specified Condition |
| J53-12 (F) - J53-8 (E) | Switch is pushed in | Below 1 Ω |
| J53-12 (F) - J53-8 (E) | Switch is not pushed in | 10 kΩ or higher |
| 3.CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - TURN SIGNAL FLASHER) |
Remove the clock assembly.
Disconnect the J30 flasher connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- With Navigation System:
| Tester Connection | Condition | Specified Condition |
| J54-12 (F) - J30-8 (HAZ) | Always | Below 1 Ω |
| J54-12 (F) - Body ground | Always | 10 kΩ or higher |
- Without Navigation System:
| Tester Connection | Condition | Specified Condition |
| J53-12 (F) - J30-8 (HAZ) | Always | Below 1 Ω |
| J53-12 (F) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 4.INSPECT FUSE (LH-IG, TURN-HAZ) |
Remove the LH-IG fuse from the cowl side J/B LH.
Remove the TURN-HAZ fuse from the engine room No. 1 J/B.
Measure the resistance of the fuses.
- Standard resistance:
- Below 1 Ω
| 5.CHECK HARNESS AND CONNECTOR (POWER SOURCE) |
Disconnect the J30 flasher connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J30-7 (E) - Body ground | Always | Below 1 Ω |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| J30-4 (B) - Body ground | Always | 10 to 14 V |
| J30-1 (IG) - Body ground | Engine switch on (IG) | 10 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 6.CHECK HARNESS AND CONNECTOR |
Remove the clock assembly.
Disconnect the J30 flasher connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- With Navigation System:
| Tester Connection | Condition | Specified Condition |
| J54-12 (F) - J30-8 (HAZ) | Always | Below 1 Ω |
| J54-12 (F) - Body ground | Always | 10 kΩ or higher |
- Without Navigation System:
| Tester Connection | Condition | Specified Condition |
| J53-12 (F) - J30-8 (HAZ) | Always | Below 1 Ω |
| J53-12 (F) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE TURN SIGNAL FLASHER |
|
LEXUS IS250, IS220d / GSE20 ALE20
