Lexus NX: Rear Sensor Communication Malfunction (C1AED)
DESCRIPTION
This DTC is stored when there is an open or short circuit in the communication line between the rear sensors and the ECU, or when there is a malfunction in a rear sensor.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1AED | Rear Sensor Communication Malfunction | An open or short circuit in the communication line between the rear sensors and ECU or a malfunction in a rear sensor during initialization mode after the power switch is turned on (IG). |
|
WIRING DIAGRAM
PROCEDURE
| 1. | INITIALIZE REAR CORNER ULTRASONIC SENSOR AND REAR CENTER ULTRASONIC SENSOR |
(a) Initialize the rear corner ultrasonic sensor (RL and RR sensor) and rear center ultrasonic sensor (RLC and RRC sensor).
Click here .gif)
|
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| 2. | CHECK DTC OUTPUT (C1AED) |
(a) Check for DTCs.
Click here
(b) Clear the DTCs.
Click here
(c) Recheck for DTCs.
Click here
| Result | Proceed to |
|---|---|
| No DTCs are output | A |
| DTC C1AED is output | B |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
|
| 3. | CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - REAR CORNER ULTRASONIC SENSOR [RL SENSOR]) |
(a) Disconnect the I20 clearance warning ECU assembly connector.
(b) Disconnect the W8 rear corner ultrasonic sensor (RL sensor).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I20-22 (BOR) - W8-4 (BI) | Always | Below 1 Ω |
| I20-24 (SOR) - W8-5 (SI) | Always | Below 1 Ω |
| I20-23 (E1) - W8-6 (EI) | Always | Below 1 Ω |
| I20-22 (BOR) or W8-4 (BI) - Body ground | Always | 10 kΩ or higher |
| I20-24 (SOR) or W8-5 (SI) - Body ground | Always | 10 kΩ or higher |
| I20-23 (E1) or W8-6 (EI) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (REAR CORNER ULTRASONIC SENSOR [RL SENSOR] - REAR CENTER ULTRASONIC SENSOR [RLC SENSOR]) |
(a) Disconnect the W8 rear corner ultrasonic sensor (RL sensor).
(b) Disconnect the W7 rear center ultrasonic sensor (RLC sensor)
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| W8-1 (BO) - W7-4 (BI) | Always | Below 1 Ω |
| W8-2 (SO) - W7-5 (SI) | Always | Below 1 Ω |
| W8-3 (EO) - W7-6 (EI) | Always | Below 1 Ω |
| W8-1 (BO) or W7-4 (BI) - Body ground | Always | 10 kΩ or higher |
| W8-2 (SO) or W7-5 (SI) - Body ground | Always | 10 kΩ or higher |
| W8-3 (EO) or W7-6 (EI) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CHECK HARNESS AND CONNECTOR (REAR CENTER ULTRASONIC SENSOR [RLC SENSOR] - REAR CENTER ULTRASONIC SENSOR [RRC SENSOR]) |
(a) Disconnect the W7 rear center ultrasonic sensor (RLC sensor)
(b) Disconnect the W6 rear center ultrasonic sensor (RRC sensor).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| W7-1 (BO) - W6-4 (BI) | Always | Below 1 Ω |
| W7-2 (SO) - W6-5 (SI) | Always | Below 1 Ω |
| W7-3 (EO) - W6-6 (EI) | Always | Below 1 Ω |
| W7-1 (BO) or W6-4 (BI) - Body ground | Always | 10 kΩ or higher |
| W7-2 (SO) or W6-5 (SI) - Body ground | Always | 10 kΩ or higher |
| W7-3 (EO) or W6-6 (EI) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | CHECK HARNESS AND CONNECTOR (REAR CENTER ULTRASONIC SENSOR [RRC SENSOR] - REAR CORNER ULTRASONIC SENSOR [RR SENSOR]) |
(a) Disconnect the W6 rear center ultrasonic sensor (RRC sensor).
(b) Disconnect the W5 rear corner ultrasonic sensor (RR sensor).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| W6-1 (BO) - W5-4 (BI) | Always | Below 1 Ω |
| W6-2 (SO) - W5-5 (SI) | Always | Below 1 Ω |
| W6-3 (EO) - W5-6 (EI) | Always | Below 1 Ω |
| W6-1 (BO) or W5-4 (BI) - Body ground | Always | 10 kΩ or higher |
| W6-2 (SO) or W5-5 (SI) - Body ground | Always | 10 kΩ or higher |
| W6-3 (EO) or W5-6 (EI) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | INSPECT REAR CORNER ULTRASONIC SENSOR (RR SENSOR) |
(a) Remove rear corner ultrasonic sensor (RR sensor).
Click here
(b) Inspect the rear corner ultrasonic sensor (RR sensor).
Click here
| NG | | REPLACE REAR CORNER ULTRASONIC SENSOR (RR SENSOR) |
|
| 8. | INSPECT REAR CENTER ULTRASONIC SENSOR (RRC SENSOR) |
(a) Remove the rear center ultrasonic sensor (RRC sensor).
Click here
(b) Inspect the rear center ultrasonic sensor (RRC sensor).
Click here
| NG | | REPLACE REAR CENTER ULTRASONIC SENSOR (RRC SENSOR) |
|
| 9. | INSPECT REAR CENTER ULTRASONIC SENSOR (RLC SENSOR) |
(a) Remove the rear center ultrasonic sensor (RLC sensor).
Click here
(b) Inspect the rear center ultrasonic sensor (RLC sensor).
Click here
| NG | | REPLACE REAR CENTER ULTRASONIC SENSOR (RLC SENSOR) |
|
| 10. | INSPECT REAR CORNER ULTRASONIC SENSOR (RL SENSOR) |
(a) Remove the rear corner ultrasonic sensor (RL sensor).
Click here
(b) Inspect the rear corner ultrasonic sensor (RL sensor).
Click here
| NG | | REPLACE REAR CORNER ULTRASONIC SENSOR (RL SENSOR) |
|
| 11. | REPLACE REAR CORNER ULTRASONIC SENSOR (RR SENSOR) |
(a) Replace the rear corner ultrasonic sensor (RR sensor) with a known good one.
Click here
HINT:
All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.
|
| 12. | CHECK DTC OUTPUT (C1AED) |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| No DTCs are output | A |
| DTC C1AED is output | B |
| A | | END (REAR CORNER ULTRASONIC SENSOR [RR SENSOR] WAS DEFECTIVE) |
|
| 13. | REPLACE REAR CENTER ULTRASONIC SENSOR (RRC SENSOR) |
(a) Replace the rear center ultrasonic sensor (RRC sensor) with a known good one.
Click here
HINT:
All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.
|
| 14. | CHECK DTC OUTPUT (C1AED) |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| No DTCs are output | A |
| DTC C1AED is output | B |
| A | | END (REAR CENTER ULTRASONIC SENSOR [RRC SENSOR] WAS DEFECTIVE) |
|
| 15. | REPLACE REAR CENTER ULTRASONIC SENSOR (RLC SENSOR) |
(a) Replace the rear center ultrasonic sensor (RLC sensor) with a known good one.
Click here
HINT:
All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.
|
| 16. | CHECK DTC OUTPUT (C1AED) |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| No DTCs are output | A |
| DTC C1AED is output | B |
| A | | END (REAR CENTER ULTRASONIC SENSOR [RLC SENSOR] WAS DEFECTIVE) |
|
| 17. | REPLACE REAR CORNER ULTRASONIC SENSOR (RL SENSOR) |
(a) Replace the rear corner ultrasonic sensor (RL sensor) with a known good one.
Click here
HINT:
All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.
|
| 18. | CHECK DTC OUTPUT (C1AED) |
(a) Clear the DTCs.
Click here
(b) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| No DTCs are output | A |
| DTC C1AED is output | B |
| A | | END (REAR CORNER ULTRASONIC SENSOR [RL SENSOR] WAS DEFECTIVE) |
| B | | REPLACE CLEARANCE WARNING ECU ASSEMBLY |
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