DTC Code | DTC Name |
---|---|
C1A4A | Skid Control Buzzer Circuit |
DESCRIPTION
Based on dynamic radar cruise control system operation, the driving support ECU assembly provides warnings to the driver by sounding the skid control buzzer.
DTC C1A4A is stored when a malfunction is detected in the skid control buzzer circuit.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
---|---|---|---|
C1A4A | Skid Control Buzzer Circuit | While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, the driving support ECU assembly detects a malfunction in the skid control buzzer circuit for approximately 0.3 seconds or more. |
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WIRING DIAGRAM
*a | from IG1 NO. 3 Relay |
*b | IG1 NO. 3 |
*c | Skid Control Buzzer |
*d | Driving Support ECU Assembly |
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following procedure.
When replacing the driving support ECU assembly, make sure to replace it with a new one. If a device which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle, and as a result, a DTC may be stored.
First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting.
PROCEDURE
CHECK FOR DTCs (PRE-COLLISION SYSTEM)
Check for DTCs of the pre-collision system.
Tech Tips
The dynamic radar cruise control system only stores DTC C1A4A when the vehicle speed reaches 36 km/h (22 mph), however the pre-collision system stores this DTC at any vehicle speed. If DTC C1A4A is stored by the pre-collision system, perform troubleshooting of the pre-collision system first.
Result | ||||||
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|
B |
GO TO PRE-COLLISION SYSTEM Click here |
A |
CHECK FOR DTCs (RADAR CRUISE)
Clear the DTCs.
Perform the following to make sure that the DTC detection conditions are met.
Tech Tips
If the following conditions are not met, the system cannot detect the malfunction.
Turn the engine switch on (IG).
Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF button).
Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.
Check for DTCs.
Result | ||||||
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|
A |
USE SIMULATION METHOD TO CHECK Click here |
B |
INSPECT SKID CONTROL BUZZER (CONFIRM BUZZER OPERATION)
Turn the engine switch on (IG).
Check that the skid control buzzer sounds.
Result | ||||||
---|---|---|---|---|---|---|
|
B |
CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - DRIVING SUPPORT ECU ASSEMBLY) Click here |
A |
CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - BATTERY)
*a | Front view of wire harness connector (to Skid Control Buzzer) |
Disconnect the K41 skid control buzzer connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
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Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - DRIVING SUPPORT ECU ASSEMBLY)
Disconnect the K41 skid control buzzer connector.
Disconnect the M2 driving support ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT SKID CONTROL BUZZER
Remove the skid control buzzer.
Inspect the skid control buzzer.
Result | |||
---|---|---|---|
|
OK |
REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here |
NG |
REPLACE SKID CONTROL BUZZER Click here |
CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - DRIVING SUPPORT ECU ASSEMBLY)
Disconnect the K41 skid control buzzer connector.
Disconnect the M2 driving support ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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Result | |||
---|---|---|---|
|
OK |
REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |