Toyota Tundra Service Manual: Heater Circuit (C1AAE)

DESCRIPTION

The forward recognition camera controls the current supplied to the camera heater (forward recognition hood).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AAE

Heater Circuit

Either of the following conditions is met after 3 seconds have elapsed since the ignition switch was turned to ON:

  • While a camera heater (forward recognition hood) ON request is being sent, a short circuit malfunction is detected in the camera heater (forward recognition hood) for 5 seconds or more.
  • While a camera heater (forward recognition hood) ON request is not being sent, an open circuit or ground short malfunction is detected in the camera heater (forward recognition hood) for 5 seconds or more.
  • Camera heater (forward recognition hood)
  • Forward recognition camera
  • Harness or connector
DTC Detection Conditions

Vehicle Condition

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

Ignition switch ON

Malfunction Status

  • While a camera heater (forward recognition hood) ON request is being sent, a short circuit malfunction is detected in the camera heater (forward recognition hood).

 
  • While a camera heater (forward recognition hood) ON request is not being sent, an open circuit or ground short malfunction is detected in the camera heater (forward recognition hood).
 

Detection Time

5 seconds or more

5 seconds or more

Number of Trips

1 trip

1 trip

HINT:

If any of the detection patterns above are met, a DTC is output.

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 it will not match the information from the vehicle and a DTC may be stored.
  • After replacing or removing/installing the forward recognition camera or windshield glass, make sure to perform forward recognition camera axis adjustment.

    Click here

PROCEDURE

1.

CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)

(a) Clear the DTCs.

Click here

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

HINT:

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

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1AAE is not output

A

DTC C1AAE is output

B

A

USE SIMULATION METHOD TO CHECK

B

2.

CHECK CAMERA HEATER (FORWARD RECOGNITION HOOD)

(a) Turn the ignition switch off.

(b) Disconnect the W10 camera heater (forward recognition hood) connector.

*1

Camera Heater (Forward Recognition Hood)

*2

Diode

*a

Component without harness connected

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W10-2 (HTR) - A-2

Always

Ignition switch off

36.1 to 39.9 Ω

W10-1 (IG1) - A-1

Always

Ignition switch off

Below 1 Ω

A-1 - A-2

  • Positive (+) tester probe → A-1
  • Negative (-) tester probe → A-2

HINT:

If the tester probes are connected to the wrong terminals, due to the existence of the diode, current will not flow and the result will be the same as for an open circuit.

Ignition switch off

Below 1 Ω

(d) Connect the W10 camera heater (forward recognition hood) connector.

NG

REPLACE CAMERA HEATER (FORWARD RECOGNITION HOOD)

OK

3.

CHECK HARNESS AND CONNECTOR (CAMERA HEATER (FORWARD RECOGNITION HOOD))

(a) Disconnect the camera heater (forward recognition hood) connector.

*a

Front view of wire harness connector

(to Camera Heater (Forward Recognition Hood))

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

W10-1 (IG1) - Body ground

Ignition switch ON

11 to 14 V

W10-1 (IG1) - Body ground

Ignition switch off

Below 1.5 V

(c) Connect the camera heater (forward recognition hood) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

4.

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

(a) Disconnect the W10 camera heater (forward recognition hood) connector.

(b) Disconnect the W9 forward recognition camera connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

W10-2 (HTR) - W9-1 (HTR)

Always

Below 1 Ω

W10-2 (HTR) or W9-1 (HTR) - Body ground

Always

10 kΩ or higher

(d) Connect the W9 forward recognition camera connector.

(e) Connect the W10 camera heater (forward recognition hood) connector.

OK

REPLACE FORWARD RECOGNITION CAMERA

NG

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

    FCM Destination Information Uninitialized (C1AAA)

    Data List / Active Test

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