Toyota Prius: Rear View Monitor System

• Precaution
• Parts Location
• System Diagram
• How To Proceed With Troubleshooting
• Problem Symptoms Table
• Terminals Of Ecu
• Image from Camera for Rear View Monitor is Abnormal

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the auxiliary negative (-) battery terminal.

Click here

HINT:

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

POINTS TO NOTE WHEN SERVICING

(a) Pay attention to the following point when servicing.

(1) A clear image may not be displayed if there is foreign matter such as water drops, snow or mud on the rear television camera lens. In such a case, wash the lens with a large amount of water and then wipe it with a soft wet cloth. Do not scrub the camera lens as scrubbing may scratch the camera lens and affect the quality of the image.

NOTES FOR REAR TELEVISION CAMERA ASSEMBLY

(a) Notes for the rear television camera assembly

(1) The rear view monitor system may not function properly if subjected to a severe blow by any hard object.

(2) The cover part of the camera is made of resin. If any organic solvent, degreaser, wax or glass coating contacts the cover, immediately wipe it off and wash the cover with water or cracks may develop.

(3) Exposing the camera to a sudden temperature change may affect proper functioning of the camera.

(4) A clear image may not be displayed if there is foreign matter such as water drops, snow or mud on the rear television camera lens. In such a case, wash the lens with a large amount of water and then wipe it with a soft wet cloth. Do not scrub the camera lens as scrubbing may scratch the camera lens and affect the quality of the image.

(5) When washing the Toyota Prius vehicle with a high-pressure washer, do not spray water on the rear television camera assembly or surrounding area. High-pressure water can damage the camera.

(b) Images may be unclear even in normal conditions if:

(1) Electrical devices are used in the cabin (noise may occur in the image).

(2) Accessories that generate radio waves have been installed (noise may occur in the image).

(3) The outer mirror switch assembly is operated (noise may occur in the image).

(4) The multi-display is cold (the image immediately after turning the ignition switch to ON may be blurred or darker than normal).

(5) The camera lens is dirty with snow, mud, etc.

(6) A strong beam of light, such as a sunbeam or headlight, hits the camera.

(7) It is too dark around the camera (at night etc.).

(8) The ambient temperature around the camera is either too high or too low.

(9) The Toyota Prius vehicle is tilted at a steep angle.

(10) The rear television camera assembly lens is scratched.

(11) The rear television camera assembly lens has drops of water on it or the humidity is high.

(12) When the camera is used under fluorescent lights, sodium lights, mercury lights, etc., the lights and the illuminated area may appear to flicker.

Parts Location

PARTS LOCATION

ILLUSTRATION

*1

REAR TELEVISION CAMERA ASSEMBLY

*2

RADIO AND DISPLAY RECEIVER ASSEMBLY

System Diagram

SYSTEM DIAGRAM

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the rear view monitor system.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

NEXT

2.	CUSTOMER PROBLEM ANALYSIS

(a) Ask the customer about the problems and the conditions at the time the malfunction occurred to make sure the problem symptom was not temporarily caused by radio waves in the surrounding environment.

HINT:

The rear view monitor display may be temporarily distorted due to radio waves around the Toyota Prius vehicle.

Problem Symptom	Cause
Both of the following conditions are met: The problem symptom indicates a rear view monitor display malfunction and the problem symptom cannot be reproduced. DTC C1622 is output as "Hist" only.*	The display may be temporarily distorted when the Toyota Prius vehicle is close to an object that transmits radio waves, such as a telecommunication tower, an airport or a truck equipped with a transceiver.

NEXT

3.	INSPECT BATTERY VOLTAGE

(a) Measure the auxiliary battery voltage with the ignition switch off.

Standard Voltage:

11 to 14 V

HINT:

If the voltage is below 11 V, replace or recharge the battery before proceeding to the next step.

NEXT

4.	CHECK AUDIO AND VISUAL SYSTEM

(a) Click here

Result	Proceed to
Audio and visual system is normal	A
Audio and visual system is abnormal	B

B

GO TO AUDIO AND VISUAL SYSTEM

A

5.	PROBLEM SYMPTOM CONFIRMATION

Result	Proceed to
Symptom does not occur	A
Symptom occurs	B

B

GO TO STEP 7

A

6.	SYMPTOM SIMULATION

(a) Refer to Symptom Simulation.

Click here

NEXT

7.	CHECK IF SAME SYMPTOM APPEARS IN OTHER SYSTEM

(a) Refer to Audio and Visual System.

Click here

Result	Proceed to
Symptom does not appear	A
Symptom appears	B

B

GO TO AUDIO AND VISUAL SYSTEM

A

8.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

B

GO TO STEP 10

A

9.	PERFORM TROUBLESHOOTING BASED ON MALFUNCTION SYMPTOM

(a) Refer to Terminals of ECU.

Click here

NEXT

10.	ADJUST, REPAIR OR REPLACE

NEXT

11.	CONFIRMATION TEST

NEXT

END

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Rear View Monitor System

Symptom	Suspected Area	Link
When reverse (R) is selected, an image of the area behind the Toyota Prius vehicle is not displayed (screen is not black)	Check that the rear camera is enabled in General Settings	-
	Audio and Visual System
	Radio and display receiver assembly
When reverse (R) is selected, an image of the area behind the Toyota Prius vehicle is not displayed (screen is black)	Proceed to "Image from Camera for Rear View Monitor is Abnormal"
	Radio and display receiver assembly
When the shift lever is not in R, an image of the area behind the Toyota Prius vehicle is displayed	Audio and Visual System
	Radio and display receiver assembly
Rear view monitor display malfunction (distortion of the color/screen) occurs continuously	Proceed to "Image from Camera for Rear View Monitor is Abnormal"
	Radio and display receiver assembly
Rear view monitor display malfunction (distortion of the color/screen) occurs temporarily	Check the usage conditions (explain to the customer that the display may be temporarily distorted when the Toyota Prius vehicle is close to an object that transmits radio waves, such as a telecommunication tower, an airport or a truck equipped with a transceiver)	-
When an image of the area behind the vehicle is displayed, the lines are misaligned (the image from the camera is tilted)	Check that the camera is correctly installed
Guide lines are not displayed	Rear television camera assembly

Terminals Of Ecu

TERMINALS OF ECU

REAR TELEVISION CAMERA ASSEMBLY

(a) Disconnect the W12 rear television camera assembly connector.

(b) Measure the voltage of each terminal of the wire harness side connector.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
W12-6 (CB ) - Body ground	Power source	Ignition switch ACC	5.5 to 7.05 V

If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the W12 rear television camera assembly connector.

(d) Measure the voltage and check for pulses at each terminal of the connector.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
W12-3 (CV ) - W12-2 (CV-)	Video signal	Ignition switch ON Reverse (R) selected Camera lens not covered, displaying an image	Pulse generation (Refer to waveform 1)
		Ignition switch ON Reverse (R) selected Camera lens covered, blacking out the screen	Pulse generation (Refer to waveform 2)
W12-5 (CGND) - Body ground	Shield ground	Always	Below 1 V

HINT:

A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the radio and display receiver assembly with the connector connected.

If the result is not as specified, the rear television camera assembly may be malfunctioning.

(e) Reference (Oscilloscope waveform):

*a	Waveform 1 (camera lens is not covered, displaying an image)
*b	Waveform 2 (camera lens is covered, blacking out the screen)
*c	Synchronization Signal
*d	Video Waveform

HINT:

A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the radio and display receiver assembly with the connector connected.

(1) Waveform 1 (camera lens is not covered, displaying an image)

Item	Content
Measurement terminal	W12-3 (CV ) - W12-2 (CV-)
Measurement setting	200 mV/DIV., 50 μs./DIV.
Condition	Ignition switch ON, reverse (R) selected

(2) Waveform 2 (camera lens is covered, blacking out the screen)

Item	Content
Measurement terminal	W12-3 (CV ) - W12-2 (CV-)
Measurement setting	200 mV/DIV., 50 μs./DIV.
Condition	Ignition switch ON, reverse (R) selected

RADIO AND DISPLAY RECEIVER ASSEMBLY

Click here

Image from Camera for Rear View Monitor is Abnormal

DESCRIPTION

The video signal of the rear television camera assembly is transmitted to the radio and display receiver assembly.

WIRING DIAGRAM

PROCEDURE

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

(a) Disconnect the K81 radio and display receiver assembly connector.

(b) Disconnect the W12 rear television camera assembly connector.

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

Standard Resistance:

Click Location & Routing(K81,W12) Click Connector(K81) Click Connector(W12)

Tester Connection	Condition	Specified Condition
K81-30 (CA ) - W12-6 (CB )	Always	Below 1 Ω
K81-28 (V ) - W12-3 (CV )	Always	Below 1 Ω
K81-29 (V-) - W12-2 (CV-)	Always	Below 1 Ω
K81-27 (CGND) - W12-5 (CGND)	Always	Below 1 Ω
K81-26 (CSLD) - Body ground	Always	Below 1 Ω
K81-30 (CA ) or W12-6 (CB ) - Body ground	Always	10 kΩ or higher
K81-28 (V ) or W12-3 (CV ) - Body ground	Always	10 kΩ or higher
K81-29 (V-) or W12-2 (CV-) - Body ground	Always	10 kΩ or higher
K81-27 (CGND) or W12-5 (CGND) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Reconnect the K81 radio and display receiver assembly connector.

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Click Location & Routing(K81) Click Connector(K81) Tester Connection Condition Specified Condition K81-29 (V-) - Body ground Always Below 1 Ω K81-27 (CGND) - Body ground Always Below 1 Ω

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

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

Standard Voltage:

Click Location & Routing(K81) Click Connector(K81)

Tester Connection	Condition	Specified Condition
K81-30 (CA ) - K81-27 (CGND)	Ignition switch ACC	5.5 to 7.05 V

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

3.	INSPECT REAR TELEVISION CAMERA ASSEMBLY

(a) Reconnect the W12 rear television camera assembly connector.

(b) Using an oscilloscope, check the waveform of the rear television camera assembly.

HINT:

A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the radio and display receiver assembly with the connector connected.

OK:

Waveform is similar to that shown in the illustration.

Item	Content
Measurement terminal	K81-28 (V ) - K81-29 (V-)
Measurement setting	200 mV/DIV., 50 μs./DIV.
Condition	Ignition switch ON, reverse (R) selected

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

*a	Waveform 1 (camera lens is not covered, displaying an image)
*b	Waveform 2 (camera lens is covered, blacking out the screen)
*c	Synchronization Signal
*d	Video Waveform

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE REAR TELEVISION CAMERA ASSEMBLY