PARKING ASSIST MONITOR SYSTEM - Display Signal Circuit between Television Camera ECU and Television Camera Assembly

DESCRIPTION

This is the display signal circuit of the television camera assembly.

WIRING DIAGRAM

Parking Assist Monitor System - Display Signal Circuit Between Television Camera Ecu And Television Camera Assembly. PARK ASSIST / MONITORING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK NAVIGATION DISPLAY

Check whether the navigation display appears properly or not.

OK:
The navigation display properly appears.

HINT:

When the navigation display has trouble, inspect the circuit between the television camera ECU and multi-display .

When the navigation display is normal, inspect the circuit between the television camera ECU and television camera assembly by following the steps below.

GO TO NAVIGATION SYSTEM

OK

2.CHECK HARNESS AND CONNECTOR (TELEVISION CAMERA ECU - TELEVISION CAMERA ASSEMBLY)

Disconnect the J92 connector from the television camera ECU.

Disconnect the Q43 connector from the television camera assembly.

Parking Assist Monitor System - Display Signal Circuit Between Television Camera Ecu And Television Camera Assembly. PARK ASSIST / MONITORING. Lexus IS250 IS220d GSE20 ALE20

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

Standard resistance:

Tester connection (Terminal No.)	Condition	Specified condition
CB+ (J92-40) - CB+ (Q43-4)	Always	Below 1 Ω
CGND (J92-39) - CGND (Q43-3)	Always	Below 1 Ω
CV+ (J92-20) - CV+ (Q43-2)	Always	Below 1 Ω
CV- (J92-19) - CV- (Q43-1)	Always	Below 1 Ω
CB+ (J92-40) - Body ground	Always	10 kΩ or higher
CGND (J92-39) - Body ground	Always	10 kΩ or higher
CV+ (J92-20) - Body ground	Always	10 kΩ or higher
CV- (J92-19) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.INSPECT TELEVISION CAMERA ECU

Reconnect the J92 connector to the television camera ECU.

Parking Assist Monitor System - Display Signal Circuit Between Television Camera Ecu And Television Camera Assembly. PARK ASSIST / MONITORING. Lexus IS250 IS220d GSE20 ALE20

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

Standard voltage:
Tester connection
(Terminal No.) Condition Specified condition
CB+ (Q43-4) - CGND (Q43-3) Engine SW on (IG), shift lever reverse position Approx. 6 V

REPLACE TELEVISION CAMERA ECU

OK

4.INSPECT TELEVISION CAMERA ASSEMBLY

Reconnect the Q43 connector to the television camera assembly.

Parking Assist Monitor System - Display Signal Circuit Between Television Camera Ecu And Television Camera Assembly. PARK ASSIST / MONITORING. Lexus IS250 IS220d GSE20 ALE20

Check the waveform of the television camera assembly using an oscilloscope.

Measurement terminal: CV+ - CV-

Measurement setting: 0.2 V/DIV, 0.2 μs/DIV.

Condition : Engine SW on (IG), shift lever in R position

OK:
Pulses as shown in the illustration.

REPLACE TELEVISION CAMERA ASSEMBLY

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE