Lexus NX: Communication Error From Clearance Sonar ECU to VSC (C164B)
DESCRIPTION
The electronically controlled brake system receives intelligent clearance sonar system information from the clearance warning ECU assembly via CAN communication. When it is determined that there is a communication error between the brake booster with master cylinder assembly (skid control ECU) and clearance warning ECU assembly, DTC C164B is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C164B | Communication Error From Clearance Sonar ECU to VSC | A communication error between the brake booster with master cylinder assembly (skid control ECU) and clearance warning ECU assembly is detected |
|
CAUTION / NOTICE / HINT
NOTICE:
-
After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
.gif)
-
When disconnecting and reconnecting the auxiliary battery
Click here
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
-
After replacing an ultrasonic sensor or the clearance warning ECU assembly, perform the necessary procedures (adjustment, calibration, initialization or registration).
Click here
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Using the Techstream, check for DTCs according to the prompts on the screen.
Click here
HINT:
After turning the power switch from off to on (IG), wait 4 seconds or more before checking for DTCs.
Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes(b) Clear the DTCs according to the screen on the Techstream.
Click here
(c) Recheck for DTCs.
Click here
HINT:
- If DTC C164B is not output after clearing the DTCs, an intermittent communication error between the clearance warning ECU assembly and brake booster with master cylinder assembly (skid control ECU) is suspected.
-
If DTC C164B is output frequently, duplicate the conditions that cause the problem symptoms and perform the inspection again, even though the DTC was not output when rechecking for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTC C164B is output | A |
| DTC C164B is not output | B |
| B | .gif) | USE SIMULATION METHOD TO CHECK |
|
.gif)
| 2. | CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Using the Techstream, check for DTCs according to the prompts on the screen.
Click here
| Result | Proceed to |
|---|---|
| DTC is not output | A |
| DTC is output | B |
| B | | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM |
|
| 3. | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
(a) Replace the clearance warning ECU assembly with a known good one.
Click here
|
| 4. | CHECK FOR DTC |
(a) Using the Techstream, check for DTCs according to the prompts on the screen.
Click here
(b) Clear the DTCs according to the screen on the Techstream.
Click here
(c) Recheck for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTC C164B is output | A |
| DTC C164B is not output | B |
| A | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) |
| B | | END (CLEARANCE WARNING ECU ASSEMBLY IS DEFECTIVE) |
READ NEXT:
Wheel Speed Sensor Malfunction (C164D)
DESCRIPTION This DTC is stored when the clearance warning ECU assembly receives a wheel speed sensor (front speed sensor RH or front speed sensor LH, rear speed sensor RH or rear speed sensor LH) abno
Stop Switch Circuit Malfunction (C164E)
DESCRIPTION When a stop light switch assembly circuit malfunction signal sent from the electronically controlled brake system is detected by the clearance warning ECU assembly, DTC C164E is stored.
Brake Hydraulic Pressure Malfunction (C164F)
DESCRIPTION When a malfunction signal sent from the brake booster with master cylinder assembly (skid control ECU) via CAN communication is detected by the clearance warning ECU assembly, DTC C164F is
SEE MORE:
Side doors
The vehicle can be locked and
unlocked using the entry function,
wireless remote control or door
lock switch.
Unlocking and locking the doors
from the outside
■ Using the smart access system with
push-button start
Carry the electronic key to enable this
function.
Grip the driver's d
Terminals Of Ecu
TERMINALS OF ECU HEADUP DISPLAY (METER MIRROR SUB-ASSEMBLY) (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition J5-1 (IG) - Body ground B - Body ground Power swi
