DESCRIPTION
The millimeter wave radar sensor assembly is connected to the forward recognition
camera via CAN communication.
The millimeter wave radar sensor assembly operates the pre-collision alarm by
sending a buzzer request signal to the skid control buzzer assembly.
If the millimeter wave radar sensor assembly detects a malfunction in the skid
control buzzer assembly circuit, it stores DTC C1A4A.
|
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
|
C1A4A
|
Skid Control Buzzer Circuit
|
When the ignition switch is ON and the pre-collision alarm is operating,
either of the following conditions is met:
- A buzzer request signal is sent to the skid control buzzer assembly
but the buzzer does not sound for 0.3 seconds or more.
- A buzzer request signal is not sent to the skid control buzzer assembly
but the buzzer sounds for 0.3 seconds or more.
|
- Skid control buzzer assembly
- Forward recognition camera
- Millimeter wave radar sensor assembly
- Wire harness or connector
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing
the following procedure.
- When replacing the millimeter wave radar sensor assembly, always replace
it with a new one.
- When the millimeter wave radar sensor assembly is replaced with a new one,
adjustment of the radar sensor beam axis must be performed.
Click here 
- If the forward recognition camera has been replaced with a new one, be sure
to perform forward recognition axis adjustment.
Click here
- When a malfunction occurs in the communication line to the forward recognition
camera, U023A and/or U1002 is output. If a DTC related to the CAN communication
line is output, first troubleshoot the CAN communication line.
Click here
PROCEDURE
|
1.
|
CHECK FOR DTCs (PRE-COLLISION SYSTEM)
|
(a) Clear the DTCs.
Click here
(b) Perform the Active Test according to the display on the Techstream.
Click here
NOTICE:
Perform the Active Test for 1 second or more.
HINT:
Performing the Active Test for 1 second or more causes DTC C1A4A to be stored
if the DTC detection conditions are met.
Body Electrical > Pre-Collision 2 > Data List
|
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
|
PCS Crash Alarm Buzzer
|
Skid control buzzer assembly status
|
ON or OFF
|
ON: Skid control buzzer assembly sounding
OFF: Skid control buzzer assembly not sounding
|
-
|
(c) Check for DTCs.
Click here
|
Result
|
Proceed to
|
|
DTC C1A4A is not output
|
A
|
|
DTC C1A4A is output
|
B
|
| A |
 |
USE SIMULATION METHOD TO CHECK
|
| B |
|
|
|
2.
|
CHECK TERMINAL VOLTAGE
|
|
(a) Disconnect the J167 skid control buzzer assembly connector.
|
|
|
*a
|
Front view of wire harness connector
(to Skid Control Buzzer Assembly)
|
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection
|
Switch Condition
|
Specified Condition
|
|
J167-2 (IG1) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
|
Ignition switch off
|
Below 1 V
|
(c) Connect the J167 skid control buzzer assembly connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER ASSEMBLY
- BATTERY)
|
| OK |
|
|
|
|
3.
|
CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - FORWARD RECOGNITION
CAMERA)
|
(a) Disconnect the J167 skid control buzzer assembly connector.
(b) Disconnect the W9 forward recognition camera connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
J167-1 (BZ) - W9-8 (BZ)
|
Always
|
Below 1 Ω
|
|
J167-1 (BZ) or W9-8 (BZ) - Body ground
|
Always
|
10 kΩ or higher
|
(d) Connect the W9 forward recognition camera connector.
(e) Connect the J167 skid control buzzer assembly connector.
| OK |
|
GO TO STEP 6
|
| NG |
|
|
|
|
4.
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER ASSEMBLY
- FORWARD RECOGNITION CAMERA)
|
(a) Repair or replace the harness or connector.
| NEXT |
|
|
|
|
5.
|
CHECK FOR DTCs (PRE-COLLISION SYSTEM)
|
(a) Clear the DTCs.
Click here
(b) Perform the Active Test according to the display on the Techstream.
Click here
NOTICE:
Perform the Active Test for 1 second or more.
HINT:
Performing the Active Test for 1 second or more causes DTC C1A4A to be stored
if the DTC detection conditions are met.
Body Electrical > Pre-Collision 2 > Data List
|
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
|
PCS Crash Alarm Buzzer
|
Skid control buzzer assembly status
|
ON or OFF
|
ON: Skid control buzzer assembly sounding
OFF: Skid control buzzer assembly not sounding
|
-
|
(c) Check for DTCs.
Click here
|
Result
|
Proceed to
|
|
DTC C1A4A is not output
|
A
|
|
DTC C1A4A is output
|
B
|
| A |
|
END
|
| B |
|
|
|
|
6.
|
INSPECT SKID CONTROL BUZZER ASSEMBLY (CONFIRM BUZZER OPERATION)
|
(a) Turn the ignition switch to ON.
(b) Check if the skid control buzzer assembly is sounding.
|
Result
|
Proceed to
|
|
The skid control buzzer assembly does not sound when the ignition switch
is ON
|
A
|
|
The skid control buzzer assembly sounds continuously when the ignition
switch is ON
|
B
|
| B |
|
GO TO STEP 8
|
| A |
|
|
|
|
7.
|
INSPECT SKID CONTROL BUZZER ASSEMBLY (UNIT INSPECTION)
|
(a) Remove the skid control buzzer assembly.
Click here
(b) Inspect the skid control buzzer assembly.
Click here
|
Result
|
Proceed to
|
|
Skid control buzzer assembly is abnormal
|
A
|
|
Skid control buzzer assembly is normal
|
B
|
| B |
|
GO TO STEP 9
|
| A |
|
|
|
|
8.
|
REPLACE SKID CONTROL BUZZER ASSEMBLY
|
(a) Replace the skid control buzzer assembly.
Click here
| NEXT |
|
|
|
|
9.
|
CHECK FOR DTCs (PRE-COLLISION SYSTEM)
|
(a) Clear the DTCs.
Click here
(b) Perform the Active Test according to the display on the Techstream.
Click here
NOTICE:
Perform the Active Test for 1 second or more.
HINT:
Performing the Active Test for 1 second or more causes DTC C1A4A to be stored
if the DTC detection conditions are met.
Body Electrical > Pre-Collision 2 > Data List
|
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
|
PCS Crash Alarm Buzzer
|
Skid control buzzer assembly status
|
ON or OFF
|
ON: Skid control buzzer assembly sounding
OFF: Skid control buzzer assembly not sounding
|
-
|
(c) Check for DTCs.
Click here
|
Result
|
Proceed to
|
|
DTC C1A4A is not output
|
A
|
|
DTC C1A4A is output
|
B
|
| A |
|
END
|
| B |
|
|
|
|
10.
|
REPLACE FORWARD RECOGNITION CAMERA
|
(a) Replace the forward recognition camera.
Click here
(b) Perform forward recognition axis adjustment.
Click here
| NEXT |
|
|
|
|
11.
|
CHECK FOR DTCs (PRE-COLLISION SYSTEM)
|
(a) Clear the DTCs.
Click here
(b) Perform the Active Test according to the display on the Techstream.
Click here
NOTICE:
Perform the Active Test for 1 second or more.
HINT:
Performing the Active Test for 1 second or more causes DTC C1A4A to be stored
if the DTC detection conditions are met.
Body Electrical > Pre-Collision 2 > Data List
|
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
|
PCS Crash Alarm Buzzer
|
Skid control buzzer assembly status
|
ON or OFF
|
ON: Skid control buzzer assembly sounding
OFF: Skid control buzzer assembly not sounding
|
-
|
(c) Check for DTCs.
Click here
|
Result
|
Proceed to
|
|
DTC C1A4A is not output
|
A
|
|
DTC C1A4A is output
|
B
|
| A |
|
END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)
|
| B |
|
|
|
|
12.
|
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY
|
(a) Replace the millimeter wave radar sensor assembly.
Click here
(b) Adjust the millimeter wave radar sensor assembly.
Click here
| NEXT |
|
|
|
|
13.
|
CLEAR DTC (PRE-COLLISION SYSTEM)
|
(a) Clear the DTCs.
Click here
Body Electrical > Pre-Collision 2 > Clear DTCs
| NEXT |
|
END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)
|
| 
