Lexus IS250 · Service Manual BODY ELECTRICAL

Reverse Signal Circuit

Circuit diagnosis

DESCRIPTION

The television camera ECU receives a reverse signal from the park/neutral position switch (A/T) or back-up light switch (M/T).

WIRING DIAGRAM

E125160E01

INSPECTION PROCEDURE


1. CHECK BACK-UP LIGHT
  1. Move the shift lever to the R position and check if the back-up light comes on.

    OK:
    The back-up light comes on.

  1. Move the shift lever to the position other than R and check if the back-up light does not come on.

    OK:
    The back-up light does not come on.



NG
GO TO LIGHTING SYSTEM
OK


2. CHECK HARNESS AND CONNECTOR

  1. E125161E01
    Disconnect the television camera ECU connector J92 and park/neutral position SW (A/T) or back-up light SW (M/T) connector.

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

    Standard resistance:
    Tester connection
    Condition
    Specified condition
    J92-3 (REV) - E45-1 (A/T)
    Always
    Below 1 Ω
    J92-3 (REV) - E55-1 (M/T)
    Always
    Below 1 Ω
    J92-3 (REV) - Body ground
    Always
    10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE


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