Lexus NX: 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 power 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 | Operate or Stop | Confirm that the vehicle is stopped and the power switch is on (IG) |
| Tester Display |
|---|
| Front Buzzer |
OK:
The No. 1 clearance warning buzzer sounds.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER) |
(a) Disconnect the I20 clearance warning ECU assembly connector.
(b) Disconnect the I21 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 |
|---|---|---|
| I20-14 (CBZ) - I21-1 (Z+) | Always | Below 1 Ω |
| I20-13 (EF) - I21-2 (Z-) | Always | Below 1 Ω |
| I20-14 (CBZ) or I21-1 (Z+) - Body ground | Always | 10 kΩ or higher |
| I20-13 (EF) or I21-2 (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.
Click here .gif)
|
| 4. | PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the power 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 | Operate or Stop | Confirm that the vehicle is stopped and the power switch is on (IG) |
| Tester Display |
|---|
| Front Buzzer |
OK:
The No. 1 clearance warning buzzer sounds.
| OK | | END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE) |
| NG | | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table.
Check each system by checking the suspec
