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.
If the millimeter wave radar sensor assembly detects a malfunction in the skid control buzzer 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:
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
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 status |
ON or OFF |
ON: Skid control buzzer sounding OFF: Skid control buzzer 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 |
|
2. |
CHECK TERMINAL VOLTAGE |
(a) Disconnect the skid control buzzer connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
N38-2 (IG1) - Body ground |
Ignition switch ON |
11 to 14 V |
Ignition switch off |
Below 1 V |
(c) Connect the skid control buzzer connector.
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER - BATTERY) |
|
3. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - FORWARD RECOGNITION CAMERA) |
(a) Disconnect the N38 skid control buzzer connector.
(b) Disconnect the F46 forward recognition camera connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
N38-1 (BZ) - F46-8 (BZ) |
Always |
Below 1 Ω |
N38-1 (BZ) or F46-8 (BZ) - Body ground |
Always |
10 kΩ or higher |
(d) Connect the F46 forward recognition camera connector.
(e) Connect the N38 skid control buzzer connector.
OK | ![]() |
GO TO STEP 6 |
|
4. |
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER - FORWARD RECOGNITION CAMERA) |
(a) Repair or replace the harness or connector.
|
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 status |
ON or OFF |
ON: Skid control buzzer sounding OFF: Skid control buzzer not sounding |
- |
(c) Check for DTCs.
Click here
Result |
Proceed to |
---|---|
DTC C1A4A is not output |
A |
DTC C1A4A is output |
B |
A | ![]() |
END |
|
6. |
INSPECT SKID CONTROL BUZZER (CONFIRM BUZZER OPERATION) |
(a) Turn the ignition switch to ON.
(b) Check if the skid control buzzer is sounding.
Result |
Proceed to |
---|---|
The skid control buzzer does not sound when the ignition switch is ON |
A |
The skid control buzzer sounds continuously when the ignition switch is ON |
B |
B | ![]() |
GO TO STEP 8 |
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7. |
INSPECT SKID CONTROL BUZZER (UNIT INSPECTION) |
(a) Remove the skid control buzzer.
Click here
(b) Inspect the skid control buzzer.
Click here
Result |
Proceed to |
---|---|
Skid control buzzer is abnormal |
A |
Skid control buzzer is normal |
B |
B | ![]() |
GO TO STEP 9 |
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8. |
REPLACE SKID CONTROL BUZZER |
(a) Replace the skid control buzzer.
Click here
|
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 status |
ON or OFF |
ON: Skid control buzzer sounding OFF: Skid control buzzer not sounding |
- |
(c) Check for DTCs.
Click here
Result |
Proceed to |
---|---|
DTC C1A4A is not output |
A |
DTC C1A4A is output |
B |
A | ![]() |
END |
|
10. |
REPLACE FORWARD RECOGNITION CAMERA |
(a) Replace the forward recognition camera.
Click here
(b) Perform forward recognition axis adjustment.
Click here
|
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 status |
ON or OFF |
ON: Skid control buzzer sounding OFF: Skid control buzzer 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) |
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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
|
13. |
CLEAR DTC (PRE-COLLISION SYSTEM) |
(a) Clear the DTCs.
Click here
NEXT | ![]() |
END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE) |
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing any parts. This non-intrusive
inspection can be very useful because intermittent conditions or signals ...
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Installation
INSTALLATION
PROCEDURE
1. INSTALL TRANSFER POSITION SWITCH (for 4WD)
Click here
2. INSTALL ENGINE SWITCH
Click here
3. INSTALL AIR CONDITIONING CONTROL ASSEMBLY
(a) Connect the connectors.
(b) Engage the 8 clips to install the air conditioning control assembly.
4. INSTALL RADIO AND DISP ...