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

Toyota Tacoma 2015-2018 Service Manual / Cruise Control / Forward Recognition Camera System / 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
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).	○
Malfunction Status	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.

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

HINT:

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

Click here

Result	Proceed to
DTC C1AAE is not output	A
DTC C1AAE is output	B

USE SIMULATION METHOD TO CHECK

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	-	-

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

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.

REPLACE CAMERA HEATER (FORWARD RECOGNITION HOOD)

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

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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.

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.

REPLACE FORWARD RECOGNITION CAMERA

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

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