DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUSE (LH-IG)
INSPECT CLEARANCE WARNING ECU (IG TERMINAL VOLTAGE)
CHECK WIRE HARNESS (CLEARANCE WARNING ECU - BODY GROUND)
CLEARANCE SONAR SYSTEM - Clearance Warning ECU Power Source Circuit
DESCRIPTION
This circuit provides power to operate the clearance warning ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
Remove the LH-IG fuse from the cowl side junction block LH.
Measure the resistance of the LH-IG fuse.
- Standard resistance:
- Below 1 Ω
| 2.INSPECT CLEARANCE WARNING ECU (IG TERMINAL VOLTAGE) |
Disconnect the Q37 ECU connector.
Measure the voltage of the wire harness side connector.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| IG (Q37-8) - Body ground | Engine switch ON (IG) | 10 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU - BATTERY) |
|
|
| 3.CHECK WIRE HARNESS (CLEARANCE WARNING ECU - BODY GROUND) |
Disconnect the Q37 ECU connector.
Measure the resistance of the wire harness side connector.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| E (Q37-27) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
LEXUS IS250, IS220d / GSE20 ALE20
