Lexus IS250 · Service Manual BODY ELECTRICAL

5C-40

Diagnostic trouble codes

DESCRIPTION

DTC
 DTC Detection Condition
 Trouble Area
5C-40
 Synchronous signals from the camera cannot be transmitted.
  1. Television Camera ECU
  2. Television Camera Assembly
  3. Wire Harness

WIRING DIAGRAM

E126125E01

INSPECTION PROCEDURE


1. CHECK NAVIGATION DISPLAY

  1. Check whether the navigation display appears properly or not.

    OK:
    The navigation display properly appears.

    HINT:
    1. When the navigation display has trouble, inspect the circuit between the television camera ECU and multi-display (Click here).
    2. When the navigation display is normal, inspect the circuit between the television camera ECU and television camera assembly by following the steps below.



 NG
GO TO NAVIGATION SYSTEM
OK


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

  1. Disconnect the J92 connector from the television camera ECU.

  1. Disconnect the Q43 connector from the television camera assembly.E125157E01

  1. 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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. INSPECT TELEVISION CAMERA ECU

  1. Reconnect the J92 connector to the television camera ECU.E125158E01

  1. 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



NG
REPLACE TELEVISION CAMERA ECU
OK


4. INSPECT TELEVISION CAMERA ASSEMBLY

  1. Reconnect the Q43 connector to the television camera assembly.E125159E01

  1. E119731E01
    Check the waveform of the television camera assembly using an oscilloscope.

    1. Measurement terminal: CV+ - CV-Measurement setting: 0.2 V/DIV., 0.2 μsec./DIV.Condition : Engine SW on (IG), shift lever in R position

      OK:
      Pulses as shown in the illustration.



 NG
REPLACE TELEVISION CAMERA ASSEMBLY
OK

REPLACE TELEVISION CAMERA ECU


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