Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Heater Circuit (C1AAE)

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

C1AAE

Heater Circuit

Either of the following conditions is met after 2 seconds have elapsed since the engine switch was turned 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.

    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 C1AAE is not output

A

DTC C1AAE is output

B

A

USE SIMULATION METHOD TO CHECK

B

2.

INSPECT FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY

(a) Turn the engine switch off.

(b) Disconnect the O11 forward recognition with heater hood sub-assembly connector.

*a

Component without harness connected

(Forward Recognition with Heater Hood Sub-assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O11-1 (IG1) - O11-2 (HTR)

Engine switch off

38 to 42 Ω

(d) Connect the O11 forward recognition with heater hood sub-assembly connector.

NG

REPLACE FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)

(a) Disconnect the O11 forward recognition with heater hood sub-assembly connector.

*a

Front view of wire harness connector

(to Forward Recognition with Heater Hood Sub-assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O11-1 (IG1) - Body ground

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1.5 V

(c) Connect the O11 forward recognition with heater hood sub-assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

4.

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

(a) Disconnect the O11 forward recognition with heater hood sub-assembly connector.

(b) Disconnect the O5 forward recognition camera connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O11-2 (HTR) - O5-1 (HTR)

Always

Below 1 Ω

O11-2 (HTR) or O5-1 (HTR) - Body ground

Always

10 kΩ or higher

(d) Connect the O5 forward recognition camera connector.

(e) Connect the O11 forward recognition with heater hood sub-assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA)

OK

5.

CHECK HARNESS AND CONNECTOR (FORWARD RECOGNITION CAMERA - BODY GROUND)

(a) Turn the engine switch off.

(b) Disconnect the O5 forward recognition camera connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O5-10 (GND) - Body ground

Always

Below 1 Ω

(d) Connect the O5 forward recognition camera connector.

OK

REPLACE FORWARD RECOGNITION CAMERA

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (FORWARD RECOGNITION CAMERA - BODY GROUND)

    FCM Destination Information Uninitialized (C1AAA)

    Data List / Active Test

    See More:

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