2007 Lexus LS 460FACTORY OEM SERVICE PROCEDURE

Reverse Signal Check for NAVI Control Unit

WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK REVERSE LAMP 
    1. Turn ignition switch ON.
    2. Place selector lever into R-position. Do back-up lamps come on?

    YES or NO 

    1. YES : GO TO 2.
    2. NO : Check back-up lamp system. Refer to BACK-UP LAMP
  2. CHECK REVERSE SIGNAL 

    With the selector lever in R-position, check voltage between NAVI control unit and ground.

    NAVI CONTROL UNIT TERMINALS VOLTAGE

    Terminals Selector lever position
    (+) (-)
    Connector Terminal (Wire color) R-position Other than R-position
    B152 27 (G/W) Ground Battery voltage Approx. 0V
    Fig 1: Checking Voltage Between NAVI Control Unit Terminals And Ground
    G03513527Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : Replace NAVI control unit. Refer to , "REMOVAL AND INSTALLATION OF NAVI CONTROL UNIT ".
    2. NG : Check harness for open or short between NAVI control unit and back-up lamp position relay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.