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.
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-
When disconnecting and reconnecting the auxiliary battery
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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-
After replacing an ultrasonic sensor or the clearance warning ECU assembly, perform the necessary procedures (adjustment, calibration, initialization or registration).
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PROCEDURE
| 1. | CHECK FOR DTC |
(a) Using the Techstream, check for DTCs according to the prompts on the screen.
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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.
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(c) Recheck for DTCs.
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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.
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| Result | Proceed to |
|---|---|
| DTC C164B is output | A |
| DTC C164B is not output | B |
| B | .gif) | USE SIMULATION METHOD TO CHECK |
|
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| 2. | CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) |
(a) Using the Techstream, check for DTCs according to the prompts on the screen.
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| 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.
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|
| 4. | CHECK FOR DTC |
(a) Using the Techstream, check for DTCs according to the prompts on the screen.
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(b) Clear the DTCs according to the screen on the Techstream.
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(c) Recheck for DTCs.
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| 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) |
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