Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Heater Circuit (C1AAE)

DESCRIPTION

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

If the forward recognition camera detects a malfunction in the camera heater (forward recognition hood) circuit, DTC C1AAE is stored.

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

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.

(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 F47 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

2 (HTR) - A-2

Always

Ignition switch off

36.1 to 39.9 Ω

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 F47 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

F47-1 (IG1) - Body ground

Ignition switch ON

11 to 14 V

F47-1 (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 F47 camera heater (forward recognition hood) connector.

(b) Disconnect the F46 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

F47-2 (HTR) - F46-1 (HTR)

Always

Below 1 Ω

F47-2 (HTR) or F46-1 (HTR) - Body ground

Always

10 kΩ or higher

(d) Connect the F46 forward recognition camera connector.

(e) Connect the F47 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)

Yaw Rate Sensor Circuit (C1AA4,C1AA5)
DESCRIPTION The forward recognition camera receives vehicle stability signals from the yaw rate and acceleration sensor (airbag sensor assembly). If the yaw rate and acceleration sensor (airbag s ...

Front Camera Module Incorrect Axial Gap (C1AA8,C1AA9)
DESCRIPTION If the forward recognition camera detects that the forward recognition camera axis has deviated, DTC C1AA8 is stored. Also, if Forward Recognition Camera Axis Adjustment is not perfor ...

Other materials:

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT DRIVER SEAT BELT WARNING LIGHT HINT: The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat. (a) Turn the ignition switch to ON. (b) When the driver seat belt is not fastened, check th ...

Blind Spot Monitor Sensor Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Blind Spot Monitor Sensor Communication Stop Mode Either Condition is met: Communication stop for "Blind Spot Monitor Master" is indicated on the "Communic ...

Short to GND in Immobiliser System Power Source Circuit (B278A)
DESCRIPTION When there is a short to GND in the power supply for the transponder key amplifier of the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation ...

© 2011-2018 Copyright www.ttguide.net