Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: No. 1 Clearance Warning Buzzer Circuit
DESCRIPTION
This circuit consists of the No. 1 clearance warning buzzer and clearance warning ECU assembly. An ECU-excited type buzzer is used. The ECU operates the buzzers using a sound pattern that changes depending on the distance to the obstacle.
WIRING DIAGRAM
PROCEDURE
| 1. | PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Advanced Parking Guidance/ICS/Intuitive P/A / Active Test.
(e) Check that the buzzer operates by performing the Active Test.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Front Buzzer | No. 1 clearance warning buzzer | Stop or Operate | Confirm that the vehicle is stopped and the engine switch is on (IG) |
| Tester Display |
|---|
| Front Buzzer |
OK:
The No. 1 clearance warning buzzer sounds.
| OK |  | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
|
| 2. | CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER) |
(a) Disconnect the J38 clearance warning ECU assembly connector.
(b) Disconnect the J17 No. 1 clearance warning buzzer connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J38-14 (CBZ) - J17-1 (Z+) | Always | Below 1 Ω |
| J38-13 (EF) - J17-2 (Z-) | Always | Below 1 Ω |
| J38-14 (CBZ) or J17-1 (Z+) - Body ground | Always | 10 kΩ or higher |
| J38-13 (EF) or J17-2 (Z-) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | REPLACE NO. 1 CLEARANCE WARNING BUZZER |
(a) Replace the No. 1 clearance warning buzzer with a new or known good one.
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|
| 4. | PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Advanced Parking Guidance/ICS/Intuitive P/A / Active Test.
(e) Check that the buzzer operates by performing the Active Test.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Front Buzzer | No. 1 clearance warning buzzer | Stop or Operate | Confirm that the vehicle is stopped and the engine switch is on (IG) |
| Tester Display |
|---|
| Front Buzzer |
OK:
The No. 1 clearance warning buzzer sounds.
| OK | | END |
| NG | | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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