Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Front Recognition Camera Heater Malfunction (C1AAE00)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Engine & Hybrid System / Cruise Control / Front Camera System / Front Recognition Camera Heater Malfunction (C1AAE00)

DESCRIPTION

The forward recognition camera controls the flow of current to the forward recognition with heater hood sub-assembly.

If the forward recognition camera detects a malfunction in the forward recognition with heater hood sub-assembly circuit, it will store this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AAE00

Front Recognition Camera Heater Malfunction
Either of the following conditions is met after 10 seconds have elapsed since the engine switch was turned to on (IG):
  • Short to +B detected in the forward recognition with heater hood sub-assembly circuit for 1 second or more cumulatively
  • Open or short to ground detected in the forward recognition with heater hood sub-assembly circuit for 5 seconds or more
  • Forward recognition with heater hood sub-assembly
  • Forward recognition camera
  • 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 forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

    HINT:

    Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition: Click here

    Sequential Recognition: Click here

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Chassis > Front Recognition Camera > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

Chassis > Front Recognition Camera > Trouble Codes

Result

Proceed to

DTC C1AAE00 is not output

A

DTC C1AAE00 is output

B
A

USE SIMULATION METHOD TO CHECK

B

2.

INSPECT FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY

*a

Component without harness connected

(Forward Recognition with Heater Hood Sub-assembly)

(a) Disconnect the U20 forward recognition with heater hood sub-assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (IG1) - 2 (HTR)

Engine switch off

28.5 to 31.5 Ω
NG

REPLACE FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)

*a

Front view of wire harness connector

(to Forward Recognition with Heater Hood Sub-assembly)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

U20-1 (IG1) - Body ground

Engine switch on (IG)

8 to 16 V

Engine switch off

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Disconnect the U14 forward recognition camera connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

U20-2 (HTR) - U14-1 (HTR)

Always

Below 1 Ω

U20-2 (HTR) or U14-1 (HTR) - Body ground

Always

10 kΩ or higher
OK

REPLACE FORWARD RECOGNITION CAMERA

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Front Recognition Camera Optical Axis Misalignment Malfunction (C1AA800)
    DESCRIPTION The forward recognition camera monitors its optical axis status. If it determines that the optical axis alignment has become misaligned, it will store DTC C1AA800. DTC No. Detection I ...

    Lost Communication with ECM/PCM "A" Missing Message (U010087,U012587,U012687,U012987,U014087)
    DESCRIPTION When a malfunction is detected between various ECUs and sensors, these DTCs are stored. DTC No. Detection Item DTC Detection Condition Trouble Area U010087 Lost Communicatio ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Parking Assist Monitor System: Reverse Signal Circuit
    DESCRIPTION The multi-display assembly receives a reverse signal from the park/neutral position switch assembly*1 or clearance warning ECU assembly*2. *1: except 12.3 Inch Display and w/ Intuitive Parking Assist System *2: for 12.3 Inch Display and w/ Intuitive Parking Assist System WIRING DIAGRAM ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Charging System: Freeze Frame Data
    FREEZE FRAME DATA DESCRIPTION The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whethe ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.0136