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Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on "Communication Bus Check".
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Communication system DTCs (DTCs that start with U) that are output correspond to "Skid Control ECU Communication Stop Mode" in "DTC Combination Table".
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Lexus NX: Skid Control ECU Communication Stop Mode
Lexus NX Service Manual / Power Source & Network / Networking / Can Communication System / Skid Control ECU Communication Stop Mode
DESCRIPTION
| Detection Item | Symptom | Trouble Area |
|---|---|---|
| Skid Control ECU Communication Stop Mode | Any of the following conditions are met: |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
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After turning the power switch off, waiting time may be required before disconnecting the cable from 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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Some parts must be initialized and set when replacing or removing and installing parts.
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Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
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After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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HINT:
- Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
- Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
| 1. | CHECK FOR OPEN IN CAN BUS WIRE (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY [SKID CONTROL ECU] BRANCH WIRE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
| (b) Disconnect the brake booster with master cylinder assembly (skid control ECU) connector. |
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(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A57-37 (CA1H) - A57-38 (CA1L) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω |
| NG | .gif) | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR |
|
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| 2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| A57-15 (BS) - Body ground | Power switch off | 11 to 14 V |
| A57-14 (BI) - Body ground | Power switch off | 11 to 14 V |
| A57-16 (IG1) - Body ground | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |
| A57-12 (IG2) - Body ground | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V |
| OK | | REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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SEE MORE:
Brake Booster Pump Motor on Time Abnormally Long (C1252,C1253)
DESCRIPTION The skid control ECU (brake booster with master cylinder assembly) detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay. DTC No. Detection Item INF Code DTC
NTSC Disconnected (from Park Assist/Monitoring ECU) (B1535,C1622)
DESCRIPTION This DTC is stored if the radio receiver assembly judges that the signals or signal lines between the television camera assembly and the multi-display assembly are not normal as a result of its self check. DTC No. Detection Item DTC Detection Condition Trouble Area B1535 N
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