Toyota Tacoma (2015-2018) Service Manual: Open or Short Circuit in Back Camera Signal (C1622)

Toyota Tacoma (2015-2018) Service Manual / Park Assist / Monitoring / Rear View Monitor System / Open or Short Circuit in Back Camera Signal (C1622)

DESCRIPTION

This DTC is stored if the radio and display receiver assembly*1 or navigation receiver assembly*2 judges as a result of its self check that the signals or signal lines between the radio and display receiver assembly*1 or navigation receiver assembly*2 and the rear television camera assembly are not normal.

DTC Code	DTC Detection Condition	Trouble Area
C1622	Open or Short Circuit in rear television camera signal	Harness or connector Rear television camera assembly Radio and display receiver assembly1 Navigation receiver assembly2

*1: w/o Navigation System
*2: w/ Navigation System

WIRING DIAGRAM

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page Result ).

Result

Result	Proceed to
No DTC is output	A
DTC is output	B

USE SIMULATION METHOD TO CHECK

2.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Result	Proceed to
w/o Navigation System	A
w/ Navigation System	B

GO TO STEP 9

3.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - REAR TELEVISION CAMERA ASSEMBLY)

(a) Disconnect the R32 radio and display receiver assembly connector.

(b) Disconnect the T22 rear television camera assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R32-11 (CA+) - T22-6 (CB+)	Always	Below 1 Ω
R32-12 (V+) - T22-3 (CV+)	Always	Below 1 Ω
R32-23 (CGND) - T22-5 (CGND)	Always	Below 1 Ω
R32-24 (V-) - T22-2 (CV-)	Always	Below 1 Ω
R32-11 (CA+) - Body ground	Always	10 kΩ or higher
R32-12 (V+) - Body ground	Always	10 kΩ or higher
R32-23 (CGND) - Body ground	Always	10 kΩ or higher
N26-24 (V-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R32-23 (CGND) - Body ground	Always	Below 1 Ω
R32-24 (V-) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Component with harness connected (Radio and Display Receiver Assembly)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

5.	CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the rear television camera assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
T22-6 (CB+) - T22-5 (CGND)	Ignition switch ACC	5.5 to 7.05 V

Text in Illustration

*a	Front view of wire harness connector (to Rear Television Camera Assembly)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

6.	CHECK REAR TELEVISION CAMERA ASSEMBLY

(a) Using an oscilloscope, check the waveform.

Text in Illustration

Component with harness connected

(Radio and Display Receiver Assembly)

Waveform 1

Waveform 2

Synchronized Signal

Video Waveform

Measurement Condition

Item	Content
Tester Connection	R32-12 (V+) - R32-24 (V-)
Tool Setting	0.2 V/DIV., 50 μs/DIV.
Condition	Waveform 1: Ignition switch ON, shift lever in R Waveform 2: Ignition switch ON, shift lever in R, screen blacked out by covering camera lens

OK:

Waveform is as shown in illustration.

HINT:

The video waveform changes according to the image sent by the rear television camera assembly.

USE SIMULATION METHOD TO CHECK

7.	REPLACE REAR TELEVISION CAMERA ASSEMBLY

(a) Replace the rear television camera assembly with a new or normally functioning one (See page ).

8.	CHECK FOR DTC

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page OK: ).

OK:

No DTCs are output.

END (REAR TELEVISION CAMERA ASSEMBLY WAS DEFECTIVE)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

9.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - REAR TELEVISIONCAMERA ASSEMBLY)

(a) Disconnect the N26 navigation receiver assembly connector.

(b) Disconnect the T22 rear television camera assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N26-11 (CA+) - T22-6 (CB+)	Always	Below 1 Ω
N26-12 (V+) - T22-3 (CV+)	Always	Below 1 Ω
N26-23 (CGND) - T22-5 (CGND)	Always	Below 1 Ω
N26-24 (V-) - T22-2 (CV-)	Always	Below 1 Ω
N26-11 (CA+) - Body ground	Always	10 kΩ or higher
N26-12 (V+) - Body ground	Always	10 kΩ or higher
N26-23 (CGND) - Body ground	Always	10 kΩ or higher
N26-24 (V-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK NAVIGATION RECEIVER ASSEMBLY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N26-23 (CGND) - Body ground	Always	Below 1 Ω
N26-24 (V-) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Component with harness connected (Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

11.	CHECK NAVIGATION RECEIVER ASSEMBLY

(a) Disconnect the rear television camera assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
T22-6 (CB+) - T22-5 (CGND)	Ignition switch ACC	5.5 to 7.05 V

Text in Illustration

*a	Front view of wire harness connector (to Rear Television Camera Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

12.	CHECK REAR TELEVISION CAMERA ASSEMBLY

(a) Using an oscilloscope, check the waveform.

Text in Illustration

Component with harness connected

(Navigation Receiver Assembly)

Waveform 1

Waveform 2

Synchronized Signal

Video Waveform

Measurement Condition

Item	Content
Tester Connection	N26-12 (V+) - N26-24 (V-)
Tool Setting	0.2 V/DIV., 50 μs/DIV.
Condition	Waveform 1: Ignition switch ON, shift lever in R Waveform 2: Ignition switch ON, shift lever in R, screen blacked out by covering camera lens

OK:

Waveform is as shown in illustration.

HINT:

The video waveform changes according to the image sent by the rear television camera assembly.

USE SIMULATION METHOD TO CHECK

13.	REPLACE REAR TELEVISION CAMERA ASSEMBLY

(a) Replace the rear television camera assembly with a new or normally functioning one (See page ).

14.	CHECK FOR DTC

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page OK: ).

OK:

No DTCs are output.

END (REAR TELEVISION CAMERA ASSEMBLY WAS DEFECTIVE)

REPLACE NAVIGATION RECEIVER ASSEMBLY

Dtc Check / Clear

DTC CHECK / CLEAR HINT: Refer to Audio and Visual System (w/o Navigation System) (See page ). Refer to Navigation System (w/ Navigation System) (See page ). ...

Reverse Signal Circuit

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