DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK FOR DTC
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - PARKING ASSIST ECU)
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - NO. 1 ULTRASONIC SENSOR [FR SENSOR])
CHECK PARKING ASSIST ECU
CHECK FOR DTC
REPLACE NO. 1 ULTRASONIC SENSOR (FL SENSOR)
CHECK FOR DTC
REPLACE NO. 1 ULTRASONIC SENSOR (FR SENSOR)
CHECK FOR DTC
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - CLEARANCE WARNING ECU ASSEMBLY)
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - NO. 1 ULTRASONIC SENSOR [FR SENSOR])
CHECK CLEARANCE WARNING ECU ASSEMBLY
CHECK FOR DTC
REPLACE NO. 1 ULTRASONIC SENSOR (FL SENSOR)
CHECK FOR DTC
REPLACE NO. 1 ULTRASONIC SENSOR (FR SENSOR)
CHECK FOR DTC
DTC C1AEC Front Sensor Communication Malfunction
DESCRIPTION
This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor.
| DTC Code | DTC Detection Condition | Trouble Area |
| C1AEC | An open or short circuit in the communication line between the front sensors and ECU or a malfunction in a front sensor during initialization mode after the engine switch is turned on (IG). | No. 1 ultrasonic sensor (front side)
Harness or connector
Parking assist ECU*1
Clearance warning ECU assembly*2
|
*1: w/ Side Monitor System
*2: w/o Side Monitor System
WIRING DIAGRAM
INSPECTION PROCEDURE
Check for DTCs ().
Result| Result | Proceed to |
| DTC C1AEC is output (w/ Side Monitor System) | A |
| DTC C1AEC is output (w/o Side Monitor System) | B |
| DTC C1AEC is not output | C |
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| | USE SIMULATION METHOD TO CHECK ()
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| 2.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - PARKING ASSIST ECU) |
Disconnect the B8 No. 1 ultrasonic sensor (FL sensor) connector.
Disconnect the F76 parking assist ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| B8-1 (BI) - F76-5 (CSB1) | Always | Below 1 Ω |
| B8-3 (SI) - F76-23 (LIN1) | Always | Below 1 Ω |
| B8-5 (EI) - F76-6 (CSG1) | Always | Below 1 Ω |
| B8-1 (BI) - Body ground | Always | 10 kΩ or higher |
| B8-3 (SI) - Body ground | Always | 10 kΩ or higher |
| B8-5 (EI) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 3.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - NO. 1 ULTRASONIC SENSOR [FR SENSOR]) |
Disconnect the B8 No. 1 ultrasonic sensor (FL sensor) connector.
Disconnect the B7 No. 1 ultrasonic sensor (FR sensor) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| B8-2 (BO) - B7-1 (BI) | Always | Below 1 Ω |
| B8-4 (SO) - B7-3 (SI) | Always | Below 1 Ω |
| B8-6 (EO) - B7-5 (EI) | Always | Below 1 Ω |
| B8-2 (BO) - Body ground | Always | 10 kΩ or higher |
| B8-4 (SO) - Body ground | Always | 10 kΩ or higher |
| B8-6 (EO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 4.CHECK PARKING ASSIST ECU |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| F76-5 (CSB1) - Body ground | Engine switch on (IG) | 7.2 to 8.8 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F76-6 (CSG1) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Component with harness connected
(Parking Assist ECU) |
| | REPLACE PARKING ASSIST ECU ()
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Check for DTCs ().
- OK:
- DTC C1AEC is not output.
| OK | |
| |
| USE SIMULATION METHOD TO CHECK ()
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| 6.REPLACE NO. 1 ULTRASONIC SENSOR (FL SENSOR) |
Replace the No. 1 ultrasonic sensor (FL sensor) with a normally functioning one ().
Check for DTCs ().
- OK:
- DTC C1AEC is not output.
| OK | |
| |
| END (NO. 1 ULTRASONIC SENSOR [FL SENSOR] IS DEFECTIVE) |
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| 8.REPLACE NO. 1 ULTRASONIC SENSOR (FR SENSOR) |
Replace the No. 1 ultrasonic sensor (FR sensor) with a normally functioning one ()
Check for DTCs ().
- OK:
- DTC C1AEC is not output.
| | REPLACE PARKING ASSIST ECU ()
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| OK | |
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| END (NO. 1 ULTRASONIC SENSOR [FR SENSOR] IS DEFECTIVE) |
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| 10.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - CLEARANCE WARNING ECU ASSEMBLY) |
Disconnect the B8 No. 1 ultrasonic sensor [FL sensor] connector.
Disconnect the F12 clearance warning ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| B8-1 (BI) - F12-21 (CSB1) | Always | Below 1 Ω |
| B8-3 (SI) - F12-9 (LIN1) | Always | Below 1 Ω |
| B8-5 (EI) - F12-19 (CSG1) | Always | Below 1 Ω |
| B8-1 (BI) - Body ground | Always | 10 kΩ or higher |
| B8-3 (SI) - Body ground | Always | 10 kΩ or higher |
| B8-5 (EI) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 11.CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FL SENSOR] - NO. 1 ULTRASONIC SENSOR [FR SENSOR]) |
Disconnect the B8 No. 1 ultrasonic sensor (FL sensor) connector.
Disconnect the B7 No. 1 ultrasonic sensor (FR sensor) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| B8-2 (BO) - B7-1 (BI) | Always | Below 1 Ω |
| B8-4 (SO) - B7-3 (SI) | Always | Below 1 Ω |
| B8-6 (EO) - B7-5 (EI) | Always | Below 1 Ω |
| B8-2 (BO) - Body ground | Always | 10 kΩ or higher |
| B8-4 (SO) - Body ground | Always | 10 kΩ or higher |
| B8-6 (EO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 12.CHECK CLEARANCE WARNING ECU ASSEMBLY |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| F12-21 (CSB1) - Body ground | Engine switch on (IG) | 7.2 to 8.8 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F12-19 (CSG1) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Component with harness connected
(Clearance Warning ECU Assembly) |
| | REPLACE CLEARANCE WARNING ECU ASSEMBLY ()
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Check for DTCs ().
- OK:
- DTC C1AEC is not output.
| OK | |
| |
| USE SIMULATION METHOD TO CHECK ()
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| 14.REPLACE NO. 1 ULTRASONIC SENSOR (FL SENSOR) |
Replace the No. 1 ultrasonic sensor (FL sensor) with a normally functioning one ().
Check for DTCs ().
- OK:
- DTC C1AEC is not output.
| OK | |
| |
| END (NO. 1 ULTRASONIC SENSOR [FL SENSOR] IS DEFECTIVE) |
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| 16.REPLACE NO. 1 ULTRASONIC SENSOR (FR SENSOR) |
Replace the No. 1 ultrasonic sensor (FR sensor) with a normally functioning one ().
Check for DTCs ().
- OK:
- DTC C1AEC is not output.
| | REPLACE CLEARANCE WARNING ECU ASSEMBLY ()
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| OK | |
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| END (NO. 1 ULTRASONIC SENSOR [FR SENSOR] IS DEFECTIVE) |
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