DESCRIPTION
When the pre-collision system is operating, the millimeter wave radar sensor
assembly sends brake control signals to the skid control ECU (brake actuator assembly).
If the millimeter wave radar sensor assembly receives a vehicle stability control
system malfunction signal from the skid control ECU (brake actuator assembly) via
CAN communication, DTC C1A50 will be stored.
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DTC No.
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Detection Item
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DTC Detection Condition
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Trouble Area
|
|
C1A50
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Brake System Malfunction
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While the ignition switch is ON, the millimeter wave radar sensor assembly
receives a vehicle stability control system malfunction signal from the
skid control ECU (brake actuator assembly) for 1 second or more.
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- Vehicle stability control system
- Millimeter wave radar sensor assembly
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CAUTION / NOTICE / HINT
NOTICE:
- When replacing the millimeter wave radar sensor assembly, always replace
it with a new one. If a millimeter wave radar sensor assembly which was installed
to another vehicle is used, the information stored in the millimeter wave radar
sensor assembly will not match the information from the vehicle. As a result,
a DTC may be stored.
- If the millimeter wave radar sensor assembly has been replaced, be sure
to perform millimeter wave radar sensor assembly adjustment.
Click here 
- The pre-collision system uses the CAN communication system. First, confirm
that there are no malfunctions in the CAN communication system. Refer to How
to Proceed with Troubleshooting.
Click here
PROCEDURE
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1.
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CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)
|
HINT:
Pre-collision system DTC C1A50 may be stored due to a malfunction in the vehicle
stability control system. Therefore, it is necessary to check for and troubleshoot
vehicle stability control system DTCs first.
(a) Check for DTCs.
Click here
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Result
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Proceed to
|
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Vehicle stability control system DTCs are not output
|
A
|
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Vehicle stability control system DTCs are output
|
B
|
| B |
 |
GO TO VEHICLE STABILITY CONTROL SYSTEM
|
| A |
|
|
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2.
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CHECK FOR DTCs (PRE-COLLISION SYSTEM)
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(a) Clear the DTCs.
Click here
(b) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(c) Check for DTCs.
Click here
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Result
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Proceed to
|
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DTC C1A50 is not output
|
A
|
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DTC C1A50 is output
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B
|
| A |
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USE SIMULATION METHOD TO CHECK
|
| B |
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REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY
|
|
